DER/CER Visibility and Access Roadmap | National Energy System Operator

What this is about

NESO wants operational visibility over — and eventual dispatch access to — the growing volume of distributed and consumer energy resources connected below the transmission-distribution boundary. This means commercial batteries, small-scale wind, rooftop solar, EVs, and home batteries: assets that currently sit outside NESO's direct operational picture.

The trigger is arithmetic. DER capacity is growing fast enough that NESO can no longer operate the system safely or efficiently without knowing what these assets are doing. When several gigawatts of embedded generation and flexible demand are invisible to the system operator, forecasting errors widen, balancing costs rise, and curtailment increases. NESO frames this as enabling Clean Power 2030, but the underlying problem is permanent: a system operator that cannot see a material share of supply and demand is flying partially blind. The consultation sets out a roadmap of capabilities and data requirements NESO believes it needs, and asks industry whether the ambition is right, the proposals are practical, and anything is missing.

The structural question is more significant than the consultation framing suggests. "Visibility and access" is diplomatic language for a substantial expansion of centralised operational control. Today, most DERs respond to price signals — wholesale prices, network charges, balancing mechanism cashflows — or to DNO instructions under Active Network Management schemes. NESO seeing these assets is one thing. NESO dispatching them is another. The roadmap encompasses both, and the difference matters: visibility is data collection; access is control. The consultation conflates them, but respondents should not.

Questions being asked

#### Ambition and scope

- Is the level of ambition for DER/CER visibility and access appropriate? *[Translation: should NESO aim for full operational visibility of all distributed assets, or is a more limited scope — say, assets above a capacity threshold — sufficient? This is the central question. The answer determines whether millions of domestic assets fall within NESO's operational perimeter.]*

- Are the proposed capabilities and data requirements complete, or are there gaps? *[Translation: has NESO identified everything it needs to see and control, or has it missed asset classes, data fields, or operational scenarios? Respondents with operational experience of DER aggregation or DNO coordination should look for blind spots.]*

#### Practicality and delivery

- Are the proposals practical and proportionate for industry to implement? *[Translation: can aggregators, DNOs, manufacturers, and asset owners actually deliver the data sharing and dispatch availability NESO is asking for, at reasonable cost? This is where the compliance burden question lives. Small battery operators and EV charge point networks face very different implementation costs than large commercial portfolios.]*

- How can NESO and industry best collaborate to deliver DER/CER visibility and access? *[Translation: who does what? NESO cannot build this alone — it needs DNO data feeds, manufacturer communication standards, and aggregator cooperation. This question is asking industry to volunteer for delivery roles and flag where NESO's dependencies are unrealistic.]*

#### System benefits

- How can improved DER/CER visibility best improve system efficiency, resilience, and renewable generation use? *[Translation: make the case for the benefits. NESO is looking for industry to quantify or at least articulate how visibility reduces curtailment, lowers balancing costs, or improves security of supply. This is the cost-benefit evidence base for whatever NESO proposes next.]*

What respondents should think about

There are no distinct options presented — this is a single roadmap with a request for challenge — but four tensions run through it that will shape responses:

Visibility vs. control. The consultation bundles data collection and dispatch access into a single roadmap, but these are different capabilities with different implications. Providing NESO with aggregated data on DER output and availability is a relatively modest ask. Giving NESO the ability to dispatch individual assets or instruct aggregators to change output is a fundamental change in operational architecture. Respondents should be precise about which they support and under what conditions.

Centralised dispatch vs. price signals. DERs currently respond to market prices. A battery charges when power is cheap and discharges when it is expensive. An EV shifts charging to overnight troughs. These are decentralised decisions driven by the price system. If NESO gains dispatch access, it introduces a second coordination mechanism — direct instruction — that may conflict with the price signal. A home battery dispatched by NESO to provide system balancing may not be available to respond to a DNO constraint, or may be forced to operate against the owner's commercial interest. The interaction between dispatch instructions and market incentives is not addressed in the consultation framing but is the core design question.

DNO coordination. DNOs already manage distributed assets through Active Network Management, flexible connections, and local constraint markets. NESO's roadmap creates a second layer of operational control over the same assets. The risk of conflicting instructions — NESO dispatching an asset up while the DNO needs it constrained down — is real and unresolved. The consultation acknowledges that "success depends on strong collaboration across the industry" but does not specify the coordination mechanism. Respondents should press for clarity on the NESO-DNO operational interface.

Cost allocation. The consultation does not address who pays for the visibility infrastructure: the data platforms, communication standards, metering upgrades, and system integration work. Three candidates exist. Network charges (socialised across all consumers), asset owners (compliance costs for data sharing), or NESO's own allowed revenue. The choice determines who bears the cost and who benefits. If the costs are socialised but the benefits accrue primarily to NESO's operational efficiency, the question is whether consumers see those savings passed through — or whether this becomes another layer of system cost without a visible consumer benefit.

The calculation problem. NESO's implicit model is that centralised visibility produces better outcomes than decentralised price response. This is an empirical claim, not an axiom. Millions of small assets responding to local price signals may coordinate more efficiently than a central operator issuing dispatch instructions based on aggregated forecasts. The consultation assumes the opposite — that the system operator needs to see and control everything — without testing it. Respondents with experience of aggregation platforms, virtual power plants, or peer-to-peer energy trading should challenge this assumption with evidence.

How to respond

Deadline: Thursday 30 April 2026.

Method: Online feedback form, linked from the consultation page on NESO's website (search "DER/CER Visibility and Access Roadmap" on the NESO website, or follow the "Consultation Feedback Form" link on the publication page).

Engagement sessions: NESO is offering engagement sessions for respondents who want to discuss feedback or seek clarification before submitting. Registration is available via the consultation page.

Format: The consultation does not prescribe a response format beyond the feedback form. Respondents with detailed technical or commercial input may wish to supplement the form with a written submission.