How does an aggregator take your business battery to grid markets?

An aggregator combines assets and manages the market interface for your battery, subject to service-specific qualification. NESO's current DFS entry threshold is 0.1 MW [S3], but that is not a universal battery minimum. Check the proposed market, fees, dispatch rights, metering and exit arrangements before signing. Treat asset ownership and operational control as separate questions. Checked October 2026.

Last checked 18 October 2026

What does a battery aggregator actually do?

An aggregator combines flexibility from separate assets into a portfolio. NESO describes its role as handling coordination, compliance and communications so smaller asset owners can reach national services. Direct registration remains another route for organisations able to manage the technical and commercial work. [S1]

For your site, start with a responsibility map. Identify who submits market instructions, who controls the battery, who receives settlement money and who answers a disputed payment. Ask whether these jobs sit with the business signing your contract or with subcontractors. Request a diagram showing the route from your meter to the final statement you receive.

Ofgem’s market-access programme includes work to simplify registration of flexible assets across markets. That policy work does not validate a particular contract or establish your site’s income. Ask which registration process applies to the market you are joining, rather than assuming one approval covers every service. [S5]

Use the battery guides for the equipment basics. This guide concerns the route to market, rather than whether purchasing a battery will pay back.

How can your battery reach the Balancing Mechanism and Dynamic Services?

The Balancing Mechanism, or BM, lets NESO instruct registered participants to change generation or demand. An aggregator can manage registration and dispatch complexity. Ask which registered unit will contain your battery and how your delivered contribution will be separated from the rest of the portfolio. [S1]

NESO’s wider-access announcement describes a 1 MW entry threshold and the virtual lead party route using secondary BM units. That describes market access for a unit, rather than requiring every battery in an aggregation to be that size. Obtain the current qualification requirements for the precise route proposed; do not buy equipment solely against a historic threshold announcement. [S2]

Dynamic Services include Dynamic Containment, Dynamic Moderation and Dynamic Regulation. They have their own pre-qualification requirements. Ask for the onboarding checklist, evidence that the proposed hardware and controls can pass testing, and responsibility for remedial work if they cannot. [S4]

Keep power and energy separate. Kilowatts, or kW, describe power; kilowatt hours, or kWh, describe stored energy. Megawatts, or MW, describe power at a larger scale. State the battery’s usable operating limits and the headroom your site can release while its normal activities continue. Name fleet charging and essential loads that must take priority in the proposed control schedule.

Does DFS still provide a route to market this winter?

NESO’s current Demand Flexibility Service, or DFS, page describes a year-round service, rather than a winter-only scheme. Its service threshold is 0.1 MW, with bidirectional flexibility and a self-nominated baseline option. Check eligibility against the current service terms and the aggregator’s own onboarding criteria. [S3]

For the service detail, read demand flexibility and DSR revenue. For separate market commitments, use Capacity Market and grid services. Ask the aggregator to identify which permissions it needs for each proposed route; a general promise to access grid markets is too vague for a site operating plan.

How should you check aggregator fees and revenue shares?

NESO says aggregators typically offer revenue-sharing arrangements. It does not provide a universal percentage on its onboarding page. Request the proposed fee schedule and a sample settlement statement, rather than treating an uncited market average as a budget input. [S1]

These are structures to check in the proposed contract, not quoted market prices:

Ask for a reconciliation in the order money changes hands: market receipts, permitted deductions, service fee, revenue allocation and amount payable to your site. Put the treatment of charging energy, conversion losses and extra battery cycling beside that reconciliation. Without those items, a headline share cannot tell you what reaches your bank account. No revenue estimate or fee percentage is assumed here.

What metering, baseline and data terms should your contract cover?

Use the Dynamic Response guidance to distinguish qualification, operational data and the measurement used for settlement. An existing electricity bill is not itself evidence that a unit meets the selected service’s technical requirements. Require the proposed metering specification and identify the test that demonstrates compliance. [S7]

Ask the counterparty to complete this handover checklist:

• Identify each meter, its location and the equipment it measures.
• Explain the baseline: the reference against which a change is assessed.
• Show how site activity, solar output and unavailable data affect that calculation.
• Demonstrate access to raw readings, dispatch records and settlement adjustments.
• Specify how long you can challenge a statement and how corrections are paid.
• Set the process for loss of communications, site override and restoration of control.

Test these questions using a sample day from your site. Ask what happens if your fleet needs the stored energy when the market instruction arrives. Record the override consequence, rather than assuming an emergency override has no contractual cost.

Who keeps the asset and what happens when the arrangement ends?

Ask your solicitor to check the term, renewal, notice, early-exit charges and removal of remote access. Specify ownership of the battery, control equipment, software access and measurement records separately. Ask what happens if the counterparty fails, sells the contract or no longer supports your inverter.

For fully funded, part funded or self funded equipment, request the same explanation of dispatch rights. Funding terminology alone does not answer who can reserve energy, change operating settings or move the asset to another market. Agree a return-of-control test and a data export at exit. Check accounting and tax treatment with your accountant; this page does not advise on either.

What should you do next?

Ask for a written market-access plan with the contract schedule attached. Check stacking permissions using NESO’s DFS list and require the aggregator to explain how it prevents overlapping obligations. [S6] Keep energy-price shifting separate using battery tariff arbitrage.

Start with earn more from your site and the site check, then get matched with an installer that covers your area.

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