MOP, DC and DA Charges Explained: The Metering Lines on Your Bill

What MOP, DC and DA charges cover, why they matter, and how to stop overpaying on the non-commodity costs you can actually negotiate.

Look closely at a half-hourly electricity bill and you will find three charges most businesses never question: MOP, DC and DA. They are small, they are fixed, and, unlike almost every other non-commodity cost, they are ones you can actually shop around on.

What These Charges Are

If your business is on a half-hourly or advanced meter, your electricity bill carries a set of charges that most smaller sites never see: MOP, DC and DA. They cover the cost of installing and maintaining your meter and of collecting, validating and processing the data it produces. Individually the amounts are modest, but they are fixed charges that appear on every bill, every day, so over a contract term they add up, and because they are often arranged separately from your supply, they are one of the few non-commodity costs you can actively shop around on.

They belong to the wider family of non-commodity costs that make up the majority of a modern business energy bill. The difference is that, unlike network or policy charges, these are contestable, you have a genuine choice of provider.

Meter Operator (MOP) Charges

The Meter Operator, or MOP, is the company responsible for installing your meter, maintaining it, and keeping it working correctly. Any business with a half-hourly or advanced (AMR) meter must have a MOP contract in place. The MOP charge is a fixed fee, usually quoted as a daily or annual amount per meter, and it is entirely separate from the cost of the electricity itself.

Crucially, you can arrange your MOP contract directly with a meter operator rather than letting your supplier appoint one by default. Left to a supplier’s default arrangement, MOP charges are frequently higher than they need to be, and an out-of-contract meter can even be charged at penalty rates. Reviewing your MOP arrangement is one of the simplest ways to trim a recurring cost with no downside to your operation.

Data Collection and Data Aggregation (DC/DA)

Once your meter is recording consumption, that data has to be retrieved, checked and passed into the industry settlement system so that everyone is billed correctly. Two roles handle this. The Data Collector (DC) retrieves the readings from your meter and validates them. The Data Aggregator (DA) then aggregates that validated data and submits it for settlement. In practice DC and DA are often provided together and shown as a single “DC/DA” charge, again as a fixed fee per meter.

As with the MOP, these services are contestable. A half-hourly site typically holds a combined MOP and DC/DA arrangement, and reviewing both together at renewal is good practice.

Why They Matter

On their own these charges will not transform your bill, but they matter for two reasons. First, they are recurring and fixed, so an uncompetitive arrangement quietly overcharges you for years. Second, they are within your control in a way that network and policy charges are not, you cannot negotiate TNUoS, but you can negotiate your MOP. That makes them low-hanging fruit in any serious review of energy cost. They also become more relevant as more sites move onto half-hourly metering, a shift accelerating under the industry’s move to market-wide half-hourly settlement.

How to Manage Them

The practical steps are straightforward. Ask for your metering charges to be shown as separate, quantified figures rather than folded into your all-in unit rate. Check whether your MOP and DC/DA are on a live contract or defaulting to a supplier-appointed arrangement, and whether any meter is sitting out of contract on penalty rates. Then review the arrangement in the market, a competitive MOP and DC/DA contract can usually be secured with no disruption to supply. Because these charges sit alongside every other line on the bill, it is worth tackling them as part of a full review rather than in isolation; our walkthrough on how to read your business energy bill shows where they appear, and a structured approach to energy procurement brings metering, supply and non-commodity costs into a single view. The regulatory framework behind metering roles sits under Ofgem’s energy regulation.

What This Means for Your Business

MOP, DC and DA charges are the metering lines on your half-hourly bill: small, fixed, recurring, and, unusually among non-commodity costs, something you can actively negotiate. For any business with one or more half-hourly meters, checking that these arrangements are on competitive contracts rather than expensive defaults is a quick win, and one that is easy to miss because the amounts look trivial line by line.

Further reading: Market-wide Half-Hourly Settlement (MHHS) explains why the half-hourly data your data collector and data aggregator handle is becoming the basis on which the entire electricity market is settled.

If you would like us to review your metering arrangements alongside the rest of your bill, our team can identify where you are overpaying and put competitive contracts in place. Get in touch to speak to one of our energy consultants today.