MOP contracts explained: meter operator, data collector and data aggregator charges

A MOP contract is a commercial agreement covering the operation of an electricity meter. MOP stands for Meter Operator, although the formal legacy industry role is usually called the Meter Operator Agent, or MOA.

For a traditional half-hourly business supply, the Meter Operator installs, commissions, tests and maintains the settlement meter. The business may contract directly with a competitive MOP, or its electricity supplier may arrange the service and recover the cost through the supply agreement.

Data Collector and Data Aggregator charges sit alongside the MOP cost. The DC retrieves and validates half-hourly readings; the DA aggregates validated data for settlement. These charges can be invoiced separately, combined with the MOP agreement or embedded within the electricity price, which is why a business should compare the complete MOP/DC/DA cost rather than one headline fee.

The most important distinction is this:

Every metered supply needs an appropriately appointed metering party, but the customer does not always need to sign a separate direct MOP contract.

The supplier controls the formal industry appointment. A direct contract records the commercial relationship between the business and its chosen provider; it does not, by itself, place that provider into the electricity-market records. The customer, MOP and supplier must therefore coordinate the appointment correctly.

This is particularly important in 2026. Market-wide Half-Hourly Settlement, or MHHS, is replacing legacy roles and data flows as individual MPANs migrate. For a migrated supply, the equivalent role is normally Metering Service Advanced, or MSA, for an advanced meter, and Metering Service Smart, or MSS, for a smart or traditional meter. Businesses and providers may continue to use “MOP contract” as commercial shorthand, but the agreement and appointment must work under the new arrangements.

Public price guides commonly place a conventional half-hourly MOP service in the broad region of £220–£600 per MPAN per year.

This is only an initial budgeting indication. Meter type, Code of Practice, communications, data services, asset ownership, site access, service levels, contract length and inflation can all change the total cost substantially.

This guide explains what a MOP contract covers, how it differs from a data contract, what happens when a business changes supplier and how to compare quotations without being misled by a low headline annual fee.

The settlement roles and MHHS transition described here apply to Great Britain. Northern Ireland participates in the separate Single Electricity Market and uses different market and metering arrangements, so a Northern Irish site should obtain advice specific to its connection and supplier.

Market rules, programme dates and public price indications last reviewed: 6 August 2026.

MOP contracts at a glance

Question	Short answer
What does MOP mean?	Meter Operator; the legacy industry role is commonly Meter Operator Agent, or MOA
What does a MOP do?	Installs, commissions, tests, maintains, repairs, exchanges and documents electricity metering equipment within its agreed scope
Does every business need a direct contract?	No. A metering service must be appointed, but the supplier can arrange it where the customer has not contracted directly
Who makes the formal appointment?	The registered electricity supplier
Can a business choose its provider?	Commonly yes for eligible commercial metering, provided the supplier can appoint the chosen qualified party
Is the MOP the electricity supplier?	Not necessarily; they are separate roles and can be separate companies
Is the MOP the DNO?	No. The DNO maintains the local network and connection; the MOP deals with settlement metering
Is data collection included?	Not automatically. Legacy DC/DA or new MHHS Data Service work may be separate or bundled
How much does a MOP contract cost?	Public commercial guides indicate roughly £220–£600 per MPAN annually for many HH arrangements, but there is no universal tariff
How long does a contract last?	One-to-five-year offers are seen; five years is common, but the signed terms govern
Does changing supplier cancel it?	Usually not. A direct MOP contract is separate and may continue after the supply contract changes
What is the main switching risk?	The gaining supplier appoints a different agent, causing appointment failure, disrupted data or duplicate cost
What changes under MHHS?	MOP becomes Metering Service for migrated MPANs: normally MSA for Advanced and MSS for Smart/Traditional
Is there a cooling-off period?	Do not assume one applies to a business MOP agreement; check the contract before accepting

What is a MOP contract?

A MOP contract sets out the commercial terms on which a Meter Operator provides metering services to a business.

It may cover one MPAN or a portfolio of hundreds. Depending on the agreement, the provider may adopt an existing meter, supply a new meter, rent the asset, maintain customer-owned equipment, manage communications and coordinate the technical information required for settlement.

A direct agreement normally identifies:

• The contracting business and Meter Operator
• Every MPAN and supply address covered
• The meter type and technical configuration
• Whether the meter is adopted, purchased or rented
• Installation, commissioning and maintenance work
• Fault and emergency service levels
• Annual and one-off charges
• Communications and data services
• The contract start date and minimum term
• Inflation or price-review provisions
• Renewal and notice requirements
• Early-termination charges
• What happens after a supplier switch, site move or disconnection
• Ownership and access to consumption data
• Liability, insurance and dispute provisions

The contract is not the same as the industry appointment.

The electricity supplier remains responsible for appointing the relevant qualified agent or service provider against the MPAN. Under MHHS, the registration systems can also hold a separate Customer Direct Contract indicator. The Retail Energy Code Company’s Electricity Enquiry Service MHHS material makes clear that the direct-contract information and the appointed-service information are distinct records.

That separation explains a common administrative problem: a customer can hold a valid commercial agreement with one provider while industry records show that another provider is formally appointed.

MOP, MOA and Metering Service: what is the difference?

The terms describe closely related concepts, but they are not perfectly interchangeable.

Term	Meaning	Where it is used
MOP	Meter Operator	Common commercial shorthand and contract wording
MOA	Meter Operator Agent	Legacy Balancing and Settlement Code role appointed by a supplier
MS	Metering Service	MHHS umbrella term for migrated MPANs
MSA	Metering Service Advanced	Metering service for an MPAN in the Advanced market segment
MSS	Metering Service Smart	Metering service for Smart and Traditional market segments
MEM	Metering Equipment Manager	Retail Energy Code terminology associated with managing metering equipment

Elexon describes Meter Operator Agents as the parties that install, commission, test and maintain meters. Under the live BSC Section L metering rules, a supplier registering an MHHS-migrated MPAN with an Advanced Meter appoints a Metering Service Advanced, while a migrated Smart or Traditional MPAN uses a Metering Service Smart.

The wording on a quotation may therefore depend on the MPAN’s migration status:

• A legacy half-hourly MPAN may still show an MOA appointment.
• A migrated advanced MPAN should show an MSA appointment.
• A migrated smart or traditional MPAN should show an MSS appointment.

The physical work may look similar, but the qualification, identifiers, processes and data flows differ. A 2026 procurement should ask the provider to explain both the legacy and MHHS position rather than relying on “MOP” as the only description.

Does a business legally need a MOP contract?

The answer depends on what is meant by “a MOP contract”.

An electricity supply needs a party appointed to carry out the applicable metering responsibilities. A half-hourly business cannot simply operate indefinitely without anyone responsible for its settlement meter.

However, this does not mean every customer must sign a separate bilateral contract with an independent MOP.

There are two common commercial routes.

Supplier-arranged metering

The electricity supplier appoints its preferred provider and incorporates or passes on the metering cost through the supply arrangement.

The customer may not receive a separate MOP invoice. The cost can appear in a standing charge, an ancillary-services schedule or an itemised metering line, or be included within the supplier’s overall price.

Customer-direct metering

The business chooses a qualified provider and signs a separate contract. It then instructs its supplier to appoint that provider to the MPAN.

The provider may invoice the customer directly. Under MHHS, the customer-direct relationship can also be recorded separately in the market data.

Neither route is automatically cheaper. A direct contract can provide transparency, continuity and better data access, but it can also create another renewal date, invoice and termination liability. Supplier-arranged metering can be administratively simpler, but the price and service scope may be less visible.

The right question is therefore not merely “Do I have a MOP contract?” It is:

Who is appointed to this MPAN, who is contractually paying them, what is included and when can the arrangement be changed?

Who is responsible for what?

Business electricity metering involves several parties. Confusing them can lead to delays or charges for work that the quoted provider never agreed to perform.

Party	Main responsibility	What it normally does not do
Electricity supplier	Registers the MPAN, buys energy, bills the customer and appoints settlement services	Own and maintain the local distribution network
Meter Operator or Metering Service	Installs, commissions, tests, maintains and exchanges settlement metering equipment within scope	Sell the electricity or maintain the DNO’s network
Meter Asset Provider	Owns or finances the meter asset in some arrangements	Necessarily operate or maintain it
Data Collector and Data Aggregator	Legacy collection, validation and aggregation of half-hourly data	Maintain the physical meter unless also contracted as MOP
Advanced Data Service	MHHS data service for the Advanced segment	Carry out MSA fieldwork unless the same group separately holds that role
Smart Data Service	MHHS data service for the Smart segment	Own the DCC network or act as the electricity supplier
Meter Data Retriever	Retrieves data in relevant MHHS arrangements	Replace the settlement meter merely because communications fail
DNO or iDNO	Maintains the local network, service cable and relevant connection equipment	Act as the customer’s energy supplier
Customer	Provides access, safe working conditions, accurate site contacts and contractual instructions	Make the formal market appointment itself
Broker or consultant	May procure or administer contracts within its authority	Automatically bind the customer unless expressly authorised

One company can perform more than one role. A metering provider may offer MOP, data collection, aggregation, reporting and energy-management software in one package. The quotation should still allocate each service and price clearly.

What does a Meter Operator do?

Elexon’s core description is concise: a Meter Operator Agent installs, commissions, tests and maintains meters. A commercial contract can expand this into a detailed service.

Installation and commissioning

The provider may:

• Confirm the required metering configuration
• Supply or adopt the meter
• Programme registers and communications
• Install the meter or coordinate installation
• Commission and test the system
• Apply seals and labels
• Record Meter Technical Details
• Notify the supplier and other market parties

The MOP cannot necessarily make an unprepared site ready. New connections can also require DNO work, customer switchgear, current transformers, meter panels, tails, isolation, civil works and a signed supply contract.

Maintenance and fault response

The provider may investigate:

• Meter failure
• Display or register faults
• Communications failure
• Clock or programming errors
• Incorrect multiplier information
• Damaged seals
• Safety concerns
• Missing or inconsistent technical details

The contract should distinguish remote investigation, routine attendance and emergency callout. “Maintenance included” does not always mean every visit, replacement or out-of-hours attendance is free.

Meter exchange and upgrade

A meter may need to be exchanged because it is faulty, obsolete, incompatible, out of certification, affected by a change in supply configuration or unsuitable for new market arrangements.

Check whether the annual fee includes:

• A like-for-like replacement
• A technology upgrade
• New communications hardware or SIM
• Meter reprogramming
• Changes following on-site generation
• Import/export configuration
• Abortive visit charges
• Disposal of the old asset

Technical data and industry notifications

Correct Meter Technical Details are essential for settlement and billing. The service provider must send the required information through the applicable industry processes.

A technically sound installation can still create billing problems if the meter serial number, multiplier, register configuration, effective date or appointed-party records are wrong.

Data access and reporting

Some MOP packages provide a portal showing half-hourly consumption, but this is not the same as the settlement Data Service.

A portal may be an optional value-added service. The contract should state:

• Data frequency and latency
• Whether values are raw, validated or estimated
• Download formats
• API availability
• User limits
• Historic-data retention
• Portfolio reporting
• Alarm and exception features
• What happens to access after termination

Read our guide to half-hourly energy meters for the uses of interval data.

What is normally excluded?

Never infer the exclusions from the headline “full MOP service”. Common exclusions can include:

• DNO connection or de-energisation work
• Customer-side electrical remedial work
• New current transformers
• Meter cabinets, panels, tails and switchgear
• Asbestos investigation or removal
• Traffic management or specialist access equipment
• Out-of-hours attendance
• Abortive visits where access is unavailable
• Damage caused by the customer or a third party
• Communications charges
• Data collection and aggregation
• Energy-management software
• Export MPAN creation
• Changes required by new generation or batteries
• Meter removal at the end of the contract
• Work outside Great Britain

An installation quotation should identify every dependency. Otherwise, a low MOP price can be followed by several separate enabling-work invoices.

MOP versus DC/DA contracts

Under legacy half-hourly settlement, the MOP and DC/DA functions are different.

The Meter Operator deals primarily with the physical meter and its technical records. The Data Collector retrieves and validates half-hourly readings. The Data Aggregator combines data for settlement. DC and DA are commonly provided together, and a metering company may offer all three services.

Service	Main task	Common customer benefit
MOP/MOA	Physical metering and technical details	Safe, compliant and maintained settlement meter
DC	Collects and validates interval data	Accurate settlement and fewer missing-read issues
DA	Aggregates data for settlement	Supports market settlement rather than being a customer dashboard
Reporting portal	Presents data to the business	Analysis, budgeting and exception monitoring

Do not assume that “data included” means DC/DA is included. It might refer only to portal access. Conversely, a DC service can feed settlement without giving the customer a sophisticated reporting platform.

Under MHHS, legacy DC and DA terminology is replaced for migrated MPANs by services including the Advanced Data Service and Smart Data Service. A current quotation should explain which role applies before migration, which applies afterwards and whether the price changes.

What does a Data Collector do?

Under legacy half-hourly arrangements, the Data Collector, or DC, obtains consumption data from the meter and validates it for settlement.

Its work can include:

• Scheduling remote data retrieval
• Managing communications exceptions
• Validating half-hourly values
• Estimating or correcting missing data under the applicable rules
• Maintaining data history
• Sending validated information to the Data Aggregator and supplier
• Investigating data-quality failures
• Providing customer files or portal feeds where contracted

The DC is not simply an internet connection. A functioning communications device can transmit inaccurate or incomplete values, while a failed communication path can require recovery, estimation and escalation.

The customer-facing value also varies. One DC package may offer a basic monthly file; another may provide next-day interval data, portfolio dashboards, alarms and APIs. Compare the settlement service and reporting product separately.

What does a Data Aggregator do?

Under legacy settlement, the Data Aggregator, or DA, receives validated metering data from Data Collectors and aggregates it for the supplier’s settlement position.

The DA normally works behind the scenes. It does not usually provide the physical meter, visit the site or create the customer’s electricity invoice. Businesses are nevertheless paying for the settlement function either directly, through a combined agent agreement or within their supplier’s charges.

DC and DA are often supplied by the same organisation and quoted as “DC/DA”. That does not make them a single legacy market role. When reviewing an appointment problem, identify whether the DC, DA or both are wrong.

MHHS changes this structure for migrated MPANs. The applicable Advanced or Smart Data Service performs the new data-service functions, while market-wide processing replaces the old customer-specific DA appointment model. Legacy DA charges should therefore not continue indefinitely for a migrated period without a clear contractual and operational explanation.

How are MOP, DC and DA charges billed?

There is no single invoice format. The same site may encounter any of the following models.

Billing model	What the customer sees	Main check
Separate MOP invoice	Annual metering charge from the chosen operator	Whether data and communications are excluded
Separate MOP and DC/DA invoices	Two direct agreements or providers	Effective dates, overlap and shared communications
Combined agent invoice	One price for MOP, DC and DA	Individual role scope and price at termination
Supplier pass-through	Itemised metering or data lines on the energy bill	Whether rates can change and whether VAT is applied consistently
Supplier-inclusive price	No obvious agent line	The embedded amount and what happens if the customer appoints directly
Broker-managed package	One invoice or collection route arranged by an intermediary	Broker fee, contracting party and authority
MHHS Metering and Data Services	MSA/MSS and ADS/SDS charges after migration	The date legacy charges stop and new charges begin

An electricity standing charge can contain metering-related cost without being a pure MOP fee. Similarly, an invoice labelled “MOP/DC/DA” can also include asset rental, communications or software.

Ask the supplier or provider to allocate the charge by:

• MPAN
• Service role
• Effective period
• Recurring or one-off status
• Direct, pass-through or embedded recovery
• VAT basis

This allocation is especially important when a site migrates to MHHS or changes supplier part-way through an annual billing period.

How much do Data Collector and Data Aggregator services cost?

Current public DC/DA tariff cards are uncommon. The charge is frequently negotiated, bundled with MOP services or recovered through the electricity-supply price. It would therefore be misleading to publish one universal 2026 “average” for DC or DA.

Request separate prices even where the provider sells one package. The quotation should show:

Data cost	Possible charging basis
Legacy DC	Per MPAN per year, per channel or bundled
Legacy DA	Per MPAN per year or included with DC
Communications	Per meter, SIM, line or technology
Data portal	Per MPAN, site, user or portfolio
API	Fixed licence, data volume or included
Historic-data load	One-off per MPAN or project
Exception work	Callout, manual retrieval or hourly rate
MHHS Data Service	Per MPAN or supplier/customer package

The worked example in this guide uses £165 per MPAN per year for combined data services and £45 for communications and portal access. Those numbers are illustrative inputs, not published market averages.

If a supplier says DC/DA is included, ask whether the price will fall or another service line will replace it after MHHS migration. The aim is not necessarily to remove all data cost; it is to prevent the legacy and new service being charged twice for the same responsibility and period.

MOP versus MAP

MOP and MAP are easy to confuse.

• The Meter Operator operates and maintains the equipment.
• The Meter Asset Provider owns or finances the equipment.

The same organisation may perform both functions, but ownership must be checked explicitly.

If the customer buys the meter, it may still need an accredited party to operate it. If the provider rents the meter, termination can trigger removal, adoption or a residual-value charge. If an existing asset is adopted, the provider may first inspect it and can reject adoption if the equipment is unsupported or the technical records are incomplete.

Questions to ask include:

1. Who legally owns the meter today?
2. Does ownership transfer at any point?
3. Is the meter price included in the annual fee?
4. What happens to the asset at expiry?
5. Can a replacement provider adopt it?
6. Who pays if adoption fails?
7. Is removal included after disconnection?

Which meters are covered?

MOP contracts are most closely associated with advanced half-hourly business meters, but metering responsibility exists across the market.

Metering situation	Point to check
Whole-current advanced meter	Whether installation or exchange requires an interruption and whether communications are included
Current-transformer meter	Responsibility for CTs, test facilities, ratios, commissioning and accuracy records
High-voltage or complex site	Code of Practice, outage planning, protection interfaces and specialist access
Smart business meter	Whether the supplier-led smart arrangement makes a separate direct contract useful or unnecessary
Import/export metering	Separate MPANs, DNO approval, bidirectional configuration and export data service
Multi-meter site	Which meter serial numbers and MPAN relationships are in scope
Landlord and tenant site	Who contracts, who pays and who retains data after occupancy changes

Do not use the first two digits of an old-style MPAN “S number” as the only test of the current settlement or market-segment position. MHHS changes the data model, and migrated MPANs have an MHHS Indicator and Market Segment information in the Electricity Enquiry Service.

The supplier or a suitably authorised industry participant can confirm the current appointed parties and migration status.

How much does a MOP contract cost?

There is no regulated national MOP tariff and no complete public price comparison covering every meter type.

Commercial providers and brokers publish broad guide figures. Current pages from Touchstone Services and Catalyst Commercial cite approximately:

• £220–£500 per year for some half-hourly supplies
• £250–£600 per year depending on the supply type

These are marketing guide ranges, not audited market averages or guaranteed quotations. They should be used for initial budgeting only.

A straightforward whole-current meter at an accessible site can cost less than a complex CT or high-voltage arrangement. Portfolio buying can reduce the unit price, while short terms, specialist equipment and enhanced response times can increase it.

What affects the price?

Cost driver	Why it matters
Meter type and Code of Practice	More complex systems require different equipment, competence and testing
Whole-current or CT metering	CT systems can require more technical work and records
Existing or new asset	Adoption may be cheaper than installation, but only if the meter is supported
Purchase or rental	Upfront capital and annual charges are allocated differently
Number of MPANs	Portfolio discounts may apply, but each site still needs administration
Contract length	A longer commitment can reduce the annual fee but increase exit exposure
Communications	Mobile, IP, DCC or other arrangements can create hardware and ongoing costs
Data services	DC/DA, ADS, SDS, retrieval and reporting may be separate
Service level	Faster attendance and out-of-hours cover usually cost more
Geography and access	Remote sites, islands, security rules and specialist access affect attendance
Installation state	Missing panels, tails, CTs or isolation can create enabling-work charges
Indexation	A modest annual increase compounds across a multi-year term
Broker or consultant fee	Commission may be included in the quoted annual price
Regulatory change	The contract may allow additional charges for material industry changes

Common charge components

Ask for a schedule separating:

• Annual MOP or Metering Service fee
• Meter rental or asset charge
• MOP adoption fee
• Installation and commissioning
• Data Service charge
• Communications and SIM charge
• Portal or software licence
• Site survey
• Routine maintenance
• Fault callouts
• Abortive visits
• Out-of-hours attendance
• Reprogramming
• Meter exchange
• Change-of-supplier administration
• Contract novation
• Disconnection and removal
• Early termination
• VAT

A quotation of £300 “for MOP” can be more expensive than a £450 inclusive service once communications, data and callouts are added.

Worked MOP contract cost example

Consider a business with three half-hourly MPANs. It receives the following illustrative proposal, excluding VAT:

Item	Per MPAN	Portfolio total
Annual MOP service	£340	£1,020
Annual data service	£165	£495
Annual communications and portal	£45	£135
Year-one recurring cost	£550	£1,650
One-off setup and adoption	£180	£540

The term is five years and recurring charges increase by 3% each anniversary.

Contract year	Recurring charge
1	£1,650.00
2	£1,699.50
3	£1,750.49
4	£1,803.00
5	£1,857.09
Total recurring charges	£8,760.07
One-off setup	£540.00
Five-year contract cost	£9,300.07

The effective cost is:

£9,300.07 ÷ 3 MPANs ÷ 5 years = £620.00 per MPAN per year

The totals use unrounded annual values; displayed year-by-year figures are rounded to the nearest penny.

The headline MOP fee was £340, but the effective all-in cost is approximately £620 per MPAN per year before VAT. That is the figure to compare with another quotation offering the same services.

This example is not a market average. It illustrates why data, communications, setup and indexation must be included.

MOP contract total-cost calculator

Use the calculator below to estimate the cost of a direct MOP arrangement across its complete term.

It includes:

• Multiple MPANs
• Annual MOP, data and communications charges
• One-off setup or adoption costs
• Annual indexation
• End-of-term or termination allowances
• A year-by-year cost schedule

Enter quoted figures on a consistent VAT basis. The result does not include the electricity supply price, DNO work or unquoted remedial work.

How contract length changes the decision

A lower annual price is not automatically the better contract.

Longer terms can reduce the provider’s acquisition and asset risk, allowing a lower annual fee. They also reduce the customer’s flexibility.

Feature	Shorter contract	Longer contract
Annual price	Often higher	Often lower
Procurement frequency	More frequent	Less frequent
Ability to change provider	Earlier	Delayed
Exposure to early-exit charges	Usually smaller	Potentially larger
Protection from price changes	Depends on fixed/indexed terms	Longer, but indexation may still apply
Fit for likely site closure	Better	Riskier
Fit for provider-funded meter	May require upfront asset cost	Can spread asset recovery

Elexon implemented CP1612 in March 2026, allowing the MHHS Customer Direct Contract end date held in industry records to extend up to 1,827 calendar days. The stated reason was that five-year customer contracts are common. This is an administrative data limit, not a rule requiring every business to sign for five years.

The commercial contract may also distinguish:

• Initial term
• Minimum term
• Renewal term
• Service commencement date
• Meter installation date
• Industry appointment date
• Invoice anniversary

These dates can differ. A contract signed in January might start charging immediately, while the supplier appointment or installation does not complete until March. The agreement should state whether the customer pays during that gap.

Indexation and price reviews

Common price mechanisms include:

• Fixed annual charges for the full term
• Consumer Prices Index adjustment
• Retail Prices Index adjustment
• A fixed annual percentage
• Inflation plus an additional margin
• Discretionary review for third-party costs
• Change-in-law or industry-change charges

Check the reference month, first increase date, rounding method and whether negative inflation can reduce the fee.

A 3% increase may appear modest, but a five-year contract has the following multipliers:

Year	Charge relative to year one
1	100.00%
2	103.00%
3	106.09%
4	109.27%
5	112.55%

Across all five years, the recurring cost is approximately 5.309 times the first-year charge, not five times.

Early termination charges

Early-exit wording is one of the most important parts of a MOP agreement.

A charge can be based on:

• All remaining annual fees
• A percentage of remaining fees
• Unrecovered meter or communications costs
• A fixed termination fee
• Meter removal or site attendance
• Lost discounts
• Broker commission already paid

Worked early-exit example

Suppose one MPAN has annual recurring charges of £600 and three years remain. The contract requires 75% of remaining charges plus a £250 asset-removal fee.

Remaining charges = £600 × 3 = £1,800

Termination element = £1,800 × 75% = £1,350

Total exit charge = £1,350 + £250 = £1,600 excluding VAT

The provider might also invoice work already completed or unpaid annual charges. The exact result depends entirely on the signed wording.

Ask how the contract treats:

• Permanent site closure
• Lease expiry
• Change of tenancy
• Demolition
• Disconnection
• Supplier failure
• Provider breach
• Regulatory change
• A meter that the new supplier cannot support

Do not assume that stopping electricity consumption ends the MOP liability.

Automatic renewal and notice periods

Some MOP agreements end on a fixed date. Others renew automatically unless notice is served within a defined window.

Check:

1. The earliest date on which notice can be given.
2. The final notice deadline.
3. The required delivery method and address.
4. Whether notice must quote every MPAN.
5. The length and price of any renewal term.
6. Whether an auto-renewal changes the termination charge.

Keep the MOP renewal date in the same contract register as the electricity supply renewal, property lease and telecoms commitments. It may not align with any of them.

What happens when you switch electricity supplier?

A direct MOP contract is separate from the electricity supply contract. Changing supplier will not normally cancel it.

The gaining supplier must appoint the appropriate metering provider in the market systems. If the customer says nothing, the gaining supplier may use its default provider. That can produce several problems:

• The contracted MOP continues invoicing despite losing the appointment.
• The supplier recovers the cost of a different provider.
• The intended provider cannot maintain or read the meter.
• Half-hourly data feeds stop or change.
• Historic portal data becomes fragmented.
• A replacement meter is proposed unnecessarily.
• Settlement or billing uses incomplete technical details.

Supplier-switch checklist

When	Action
Before accepting the supply quote	Tell the proposed supplier that a customer-direct MOP or Metering Service contract exists
During onboarding	Give the supplier the MPAN schedule, provider name, MPID/DIP ID and contract dates
Before the switch date	Obtain written confirmation that the chosen provider will be appointed or retained
After the switch	Ask the MOP and supplier to confirm the effective appointment
First month	Check that interval data, invoices and portal feeds continue
First supplier bill	Check that no second MOP or data-service charge has been added

The provider’s commercial name is not enough. Industry appointments use identifiers such as MPIDs and, under MHHS, DIP IDs. Obtain the exact identifiers from the contracted provider.

Duplicate MOP charges

Duplicate cost can occur without two identical MOP invoices.

For example:

• The direct MOP invoices £350 annually.
• The supplier’s standing charge includes its default metering cost.
• A separate data provider also invoices for a service assumed to be bundled.

To investigate, request:

• The supplier’s complete price schedule
• The direct MOP contract and invoice
• The MPAN-specific appointed-party record
• The effective dates of every appointment
• The data-service contract
• Any broker cost schedule
• Evidence of meter ownership

An apparent overlap is not always a true duplicate. The invoices may cover different roles, assets or periods. Compare scope and effective dates before demanding a cancellation.

If the wrong provider has been appointed, correct the market record as well as the invoice. Fixing only the bill can leave the operational problem unresolved.

MOP contracts and MHHS in 2026

Market-wide Half-Hourly Settlement is changing the roles, systems and terminology used for electricity metering in Great Britain.

Permanent migration began in late October 2025. Ofgem’s approved MHHS programme dates, together with its April 2026 P495 decision, include:

• 28 October 2026 for the supplier qualification milestone, M14
• 7 May 2027 for full migration completion, M15
• July 2027 for the move to the faster settlement timetable, M16

Individual MPANs migrate before the final deadline. Two sites with the same supplier may therefore be operating under different arrangements at a particular time.

Legacy and MHHS role mapping

Legacy description	MHHS description for migrated MPANs
Meter Operator Agent	Metering Service Advanced or Metering Service Smart
Half-Hourly Data Collector	Advanced Data Service for the Advanced segment
Non-Half-Hourly Data Collector	Replaced by the applicable Smart/Traditional service model
Data Aggregator	Centralised MHHS processing replaces the old appointment structure
DTC data flows	Many interactions move through the Data Integration Platform

The exact service depends on the market segment and meter, so the table is a procurement guide rather than a one-to-one legal mapping for every edge case.

Why the direct-contract flag matters

For migrated MPANs, the Electricity Enquiry Service can display a Customer Direct Contract Metering Service indicator together with the provider’s identifiers.

However, RECCo’s published EES material says this information is separate from the appointed-agent information. The currently appointed service can set the customer-direct indicator, but a direct-contract flag does not prove that the same provider is the active appointed service.

After migration, check both:

1. The customer-direct contract record.
2. The active Metering Service appointment.

Questions to ask a provider about MHHS

1. Are you qualified for MSA, MSS or both?
2. Which service will apply to each MPAN?
3. What are your MPID and DIP ID?
4. Who will set and maintain the Customer Direct Contract record?
5. Does migration change the price or contract term?
6. Will the existing agreement be amended, novated or simply interpreted using new role names?
7. Which legacy DC/DA services end, and when?
8. Which new Data Service is included?
9. Will portal data and APIs continue without interruption?
10. Who resolves failed migration or appointment messages?
11. Can the supplier appoint you under both legacy and MHHS arrangements?
12. What happens if an MPAN is reverse migrated?

A clause allowing unlimited additional fees for any “industry change” should be challenged. Ask for objective triggers, evidence of cost, notice and a termination right where the change is material.

How to compare MOP quotations

The safest comparison is a like-for-like total-cost schedule.

Step 1: use the same MPAN list

Provide every bidder with:

• MPAN core
• Supply address
• Meter serial number
• Meter type
• Current appointed agent
• Current asset owner, if known
• Current contract end date
• Required data and service levels
• Known migration status

Remove closed or duplicated MPANs. Identify paired import and export supplies separately.

Step 2: define the required service

State whether the quote must include:

• MOP/MSA/MSS
• Meter rental or adoption
• Installation
• Communications
• Data Service
• Customer portal
• API access
• Historic data migration
• Fault attendance
• Multi-site reporting
• Supplier-switch administration

Step 3: build a complete cost schedule

Comparison field	Quote A	Quote B	Quote C
Initial term
Annual MOP/MS fee
Annual data-service fee
Communications
Portal/API
Setup/adoption
Installation
Routine callouts
Indexation formula
Five-year total
Average per MPAN/year
Early-exit formula
Renewal term

Where terms differ, compare a common period but do not invent the renewal price. Mark the uncontracted years as uncertain.

Step 4: score service as well as price

A practical evaluation might allocate weight to:

• Total cost
• MHHS capability
• Fault-response service level
• Appointment management
• Data completeness and latency
• Portal usability
• API and data ownership
• Geographic coverage
• References for similar sites
• Contract flexibility

The cheapest quote can be poor value if missing data delays invoicing or if no one takes responsibility for a failed supplier appointment.

Direct MOP contract versus supplier-arranged service

Issue	Direct customer contract	Supplier-arranged service
Price visibility	Usually clearer	May be bundled or embedded
Choice of provider	Greater	Usually limited to supplier panel
Continuity after supplier switch	Contract can continue, but appointment must be managed	New supplier normally manages its own arrangement
Separate invoice	Common	Less common
Separate renewal date	Yes	May align with supply term
Data portal	Can be selected independently	Depends on supplier offer
Administration	Customer must coordinate more parties	Supplier carries more coordination
Early-exit exposure	Directly governed by MOP agreement	May sit within supply contract
Portfolio consistency	One provider can cover multiple suppliers	Can fragment across suppliers
MHHS transition	Customer should verify provider qualification	Supplier selects compatible service

A direct arrangement often suits a multi-site business that values consistent data and periodically changes energy supplier. Supplier-arranged service can suit a smaller organisation that prefers a single commercial relationship and does not need an advanced independent portal.

Contract clauses to check before signing

Parties and authority

Confirm the legal company name and registration number of the provider. If a broker arranged the agreement, identify whether it is the contracting party, an agent or only an introducer.

Check that the person accepting the contract has authority. Read any letter of authority carefully; permission to obtain data or quotations is not necessarily permission to sign a contract.

MPAN schedule

The site schedule should be part of the agreement and version-controlled. It should explain how MPANs can be added, removed or corrected and whether a minimum portfolio volume applies.

Scope and exclusions

List the physical, data and administrative services precisely. Avoid relying on sales emails if the contract contains an entire-agreement clause that excludes earlier statements.

Asset ownership

Record the manufacturer, model, serial number and owner where available. State what happens to rented, adopted and purchased equipment at expiry.

Charges and VAT

Confirm whether every figure is inclusive or exclusive of VAT, when invoices are issued and whether the fee is per meter, MPAN, channel or site.

Indexation

Define the index, reference period, cap, floor, first increase and treatment of negative inflation.

Service commencement

State whether charging starts at signature, appointment, adoption, installation or successful data flow.

Service levels

Include acknowledgement, remote-response and site-attendance times. Separate routine faults from safety emergencies and communications failures.

Access and abortive visits

Define reasonable notice, permitted working hours, induction requirements, security clearance and the abortive-visit charge.

Data rights

The business should know what data it can download, how quickly, for how long and in which format. Address onward sharing with consultants, landlords, tenants and replacement providers.

Change of supplier

Require the provider to supply appointment identifiers promptly and support gaining-supplier onboarding. State who bears cost if the provider fails to accept a valid appointment.

MHHS change

Specify how MOP/MOA services transition to MSA or MSS and how DC/DA transitions to the appropriate Data Service. Prevent duplicate charging for legacy and replacement services over the same period unless justified.

Termination

Set out notice, breach remedies, remaining-fee calculations, asset costs and removal. Include treatment of permanent closure, disconnection and loss of lease.

Renewal

Confirm whether the agreement expires, rolls monthly or renews for another fixed term.

Liability and insurance

Review exclusions for lost data, inaccurate technical details, business interruption and physical damage. A liability cap should be assessed against the plausible loss at the site.

Subcontracting

Identify whether fieldwork, communications or data processing can be subcontracted and who remains responsible.

Complaints and disputes

Record the complaints address, escalation route, governing law and any mediation, arbitration or court clause.

Common MOP contract mistakes

Assuming the supplier will find the direct contract

Give each gaining supplier written notice and the provider’s industry identifiers. A broker note buried in procurement paperwork is not reliable appointment instruction.

Comparing only the annual MOP line

Add data, communications, portal, setup, inflation and termination risk.

Signing before confirming the current contract end date

Overlapping contracts can create two commercial liabilities even though only one provider can hold the active appointment at a time.

Treating MOP and DC as the same service

A contract can include one and exclude the other. Ask for separate role descriptions.

Ignoring meter ownership

A cheap annual service can rely on an asset that must be purchased, rented or removed separately.

Allowing the term to begin before service starts

Tie charging to a clear event and require credit for avoidable appointment delays.

Forgetting vacant and closed sites

Zero kWh consumption does not automatically remove a fixed metering contract charge.

Accepting vague MHHS wording

The provider should identify its applicable service, qualification and price after migration.

Giving a broker excessive authority

Limit an LOA to the required information and actions. Do not assume a standard document is non-signing.

Cancelling the direct debit before resolving the contract

Stopping payment does not necessarily end liability and can add debt-recovery cost. Dispute the invoice formally and follow the contractual process.

How to appoint or change a MOP

1. Check the current position

Gather the electricity bill, MPAN, meter details, existing MOP invoices, supply contract and any broker paperwork.

Ask the current provider for the contract end date, notice terms, asset ownership and appointed identifiers.

2. Confirm the requirement

Decide whether the business wants only metering, or an integrated metering, data and reporting package.

3. Obtain comparable quotations

Use the same site list, scope and start date. Require an all-in term cost.

4. Check qualification and compatibility

Confirm that the chosen provider can perform the applicable legacy and MHHS roles. Elexon publishes Industry Standing Data and information about qualified market participants.

5. Sign subject to clear conditions

Where appropriate, make commencement conditional on appointment, adoption and any required installation work.

6. Instruct the supplier

Give the supplier the correct company name, MPID, DIP ID, effective date and customer-direct contract information.

7. Monitor the appointment

Do not assume silence means success. Obtain confirmation from both supplier and provider.

8. Validate the first data and invoices

Check meter serial number, multiplier, interval data, start date and every charge.

Read our business electricity meter installation guide if the project also requires a new meter or connection.

Managing a multi-site MOP portfolio

Multi-site businesses should maintain a metering register containing:

Field	Why it matters
MPAN core	Unique supply-point reference
Site and billing address	Prevents misallocated invoices
Meter serial number	Connects the contract to the physical asset
Meter type and CT ratio	Supports technical and billing checks
Import or export	Prevents paired MPANs being confused
Current supplier	Identifies the appointing party
Appointed MOP/MS	Confirms operational responsibility
Direct-contract provider	Identifies commercial liability
MPID and DIP ID	Supports correct appointment
Data Service	Identifies data-flow responsibility
Contract start and end	Controls renewal
Notice deadline	Prevents unwanted rollover
Annual fee and index	Supports budgets
Asset owner	Clarifies replacement and exit
MHHS status and segment	Determines current role model
Portal and API status	Confirms customer data access

Reconcile this register against supplier records after every acquisition, disposal, tenancy change, supplier switch and meter exchange.

MOP contracts for landlords and tenants

The supply-account holder is not always the property owner.

A lease should be checked for:

• Responsibility for utility contracts
• Ownership of tenant-installed equipment
• Landlord consent for meter changes
• Rights of access to plant rooms
• Reinstatement at lease expiry
• Transfer of contracts to an incoming tenant
• Historic data access
• Dilapidations and removal costs

If the tenant signs a five-year MOP agreement with only two years left on the lease, an early-exit charge can survive the move. Align the term with the lease or negotiate a documented transfer or closure provision.

At a multi-let property, distinguish the landlord’s incoming meter from tenant sub-metering. A private sub-metering contractor is not necessarily the settlement MOP for the MPAN.

MOP contracts for generation and export

On-site solar, wind, CHP or battery projects can require new or reconfigured export metering.

Check:

• Whether the existing meter records import and export separately
• Whether a new export MPAN is required
• DNO connection approval
• Meter Code of Practice and accuracy requirements
• The MOP and Data Service for the export MPAN
• Who receives export data
• Whether the PPA or SEG counterparty specifies a provider
• Whether import and export services share communications
• Responsibility for commissioning before generation starts

Do not assume the import MOP contract automatically covers export. The export MPAN can have its own appointment, data and commercial requirements.

How to dispute a MOP charge or service failure

Start by identifying which contract created the charge.

If the MOP invoices directly

Use the MOP’s formal complaints or dispute procedure. Send:

• Legal business name
• MPAN and site address
• Contract and invoice numbers
• Meter serial number
• Disputed period and amount
• The relevant contract clause
• Appointment evidence
• Supplier correspondence
• The outcome required

Ask the provider to place collection activity for the genuinely disputed amount on hold while it investigates, without withholding undisputed sums.

If the supplier bills or appointed the service

Raise a formal complaint with the electricity supplier. Ask it to identify the appointed provider, effective dates and contractual basis for the charge.

Ofgem says eligible micro and small businesses can take unresolved supplier complaints to the Energy Ombudsman. Larger businesses generally need to use the contract and civil courts. A dispute arising solely under a direct MOP contract is not automatically within the Ombudsman’s scope, so check whether the provider and complaint type are covered before relying on that route.

If a broker arranged the agreement

Complain to both the broker and the contracting provider where the dispute concerns authority, disclosure or commission. Keep the signed LOA, call recording request, quotation, acceptance evidence and complete terms.

Questions to ask before signing

1. What exact legacy and MHHS roles are included?
2. Are you qualified for the market segment of every MPAN?
3. What are your MPID and DIP ID?
4. Is the Data Service included or separate?
5. Does “data access” mean raw, validated or settlement data?
6. Who owns the meter?
7. Are adoption, installation and communications included?
8. What can cause an additional site charge?
9. When does billing start?
10. How is the annual increase calculated?
11. What is the complete cost across the initial term?
12. What happens if the supplier does not appoint you?
13. What support is provided when the customer changes supplier?
14. What happens when the MPAN migrates to MHHS?
15. Will legacy and MHHS services ever be charged simultaneously?
16. What fault-response times are contractual?
17. Is out-of-hours attendance included?
18. What is the abortive-visit fee?
19. Can data be downloaded through an API?
20. How long is data retained after termination?
21. What is the notice deadline?
22. Does the contract renew automatically?
23. How is early termination calculated?
24. What happens if the site closes or the lease ends?
25. Is broker commission included in the price?
26. Are all figures exclusive or inclusive of VAT?

Frequently asked questions

Final MOP contract checklist

Before signing or renewing, confirm:

• Every MPAN and site is correct.
• The current contract end date and notice deadline are known.
• The active appointed provider has been verified.
• The proposed provider’s MPID and DIP ID are recorded.
• The applicable MOP, MSA or MSS role is clear.
• Data Service responsibilities are documented separately.
• Meter ownership is confirmed.
• Installation, adoption and communications are priced.
• The service commencement date is objective.
• Fault and attendance service levels are contractual.
• Portal, API and historic-data rights are stated.
• All annual and one-off fees are included.
• Indexation has been modelled over the complete term.
• VAT treatment is consistent across quotations.
• Broker fees and authority are disclosed.
• Supplier-switch responsibilities are allocated.
• MHHS migration cannot create unexplained duplicate charges.
• Renewal and notice rules are diarised.
• Early termination has a calculable formula.
• Closure, disconnection and tenancy changes are covered.
• The complaints and dispute route is clear.

Final verdict

A MOP contract can give a business greater control over metering cost, service levels and half-hourly data. It can be particularly valuable for a multi-site organisation that wants one metering provider to remain consistent while electricity suppliers change.

The customer should not confuse commercial choice with formal appointment. The electricity supplier appoints the Meter Operator or Metering Service in the market systems, while a direct contract sits alongside that appointment. Both records need to agree.

In 2026, every new or renewed agreement should also address MHHS. “MOP” remains familiar shorthand, but migrated MPANs use Metering Service Advanced or Metering Service Smart and new data-service arrangements. Qualification, MPID and DIP ID details should be confirmed before signing.

Do not select a contract from the annual MOP fee alone. Compare the full cost of metering, assets, communications, data, setup, indexation and exit across the complete term. Then test how the arrangement will behave when the business switches supplier, closes a site or reaches its lease expiry.

Finally, review metering alongside the wider electricity contract. A competitive MOP fee cannot compensate for an unsuitable business electricity tariff, and a cheap energy quotation can be undermined by undisclosed metering and data costs. The best procurement treats the supply contract and metering contract as separate agreements that must work together.