From 24 GW to 66 GW — The Flexibility Investment Opportunity of the Decade

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In July 2025, the government — working with Ofgem and NESO — published the Clean Flexibility Roadmap. Its central ask is extraordinary: a two- to three-fold increase in the UK's clean flexibility capacity, from approximately 24 GW in 2023 to 51–66 GW by 2030. By 2050, the Roadmap's central scenario projects flexibility capacity reaching 204 GW — an eightfold increase from today.

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This is not an aspiration. It is a policy commitment backed by regulatory action, market reform, and public investment — and the commercial opportunity it creates is already materialising in the market.

 

What "Flexibility" Actually Means (And Why It Matters Now)

Flexibility is the ability of the power system to match supply and demand as renewable generation output varies with weather and time of day. As the UK grid approaches 95% clean generation by 2030, the variability of wind and solar output means that flexibility — the ability to store, shift, or curtail electricity rapidly — becomes the critical system service.

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The Clean Flexibility Roadmap covers the full technology stack:

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• Short-duration batteries (BESS): The dominant near-term technology. 23–27 GW targeted by 2030, up from approximately 5 GW today.

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• Long Duration Electricity Storage (LDES): 4–6 GW targeted by 2030. Includes pumped hydro, compressed air, liquid air, and flow batteries. The Ofgem cap-and-floor scheme is the primary investment mechanism.

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• Interconnectors: Already 10 GW, rising to 12–14 GW by 2030. Provide cross-border flexibility — but are geopolitically exposed.

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• Low Carbon Dispatchable Power: 2–7 GW targeted. Includes hydrogen-to-power and CCUS-equipped gas — technologies with significant policy and commercial uncertainty still to be resolved.

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• Consumer-Led Flexibility (CLF): Perhaps the most underestimated opportunity. Vehicle-to-grid (V2X), smart tariffs, heat pump demand response, and industrial DSR. P483 (approved August 2025) has already unlocked access for approximately 345,000 households and small businesses previously excluded from the flexibility market.

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• Vehicle-to-Everything (V2X): Expected to grow significantly post-2030, but commercial pilots are active now.

 

The Policy Actions That Matter Most

The Roadmap is not a wish list. It contains specific, time-bound actions with named owners. The most commercially significant are:

 

• LDES cap-and-floor scheme: First projects expected to be approved by Q2 2026, with preliminary cap and floor levels set at that stage. A second application window decision was due by Q1 2026 — watch for that announcement.

 

• Skip rate reform: NESO is tasked with addressing the systematic bypassing of battery bids in the Balancing Mechanism, even when batteries are the cheapest available option. This reform, if delivered, could materially improve BESS revenue capture.

 

• Market-Wide Half-Hourly Settlement (MHHS): Expected in 2026, MHHS will expose electricity suppliers to the true half-hourly cost of serving customers — creating a structural incentive for smart tariffs and consumer flexibility products at scale.

 

• Blended finance for LDES: The government committed to exploring blended finance (combining grant, debt, and equity instruments) specifically to de-risk LDES investment in technologies not yet commercially ready for the cap-and-floor scheme alone.

 

• Carbon reporting for flexibility actions: By April 2026, NESO is exploring options for large industrial consumers to report carbon savings from flexibility actions — creating a direct link between flexibility participation and ESG reporting frameworks.​

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The Tension in the Market

The flexibility agenda is not without structural tension. The LDES cap-and-floor scheme introduces subsidised competition into markets currently served by unsubsidised short-duration BESS — a conflict that Zenobē and others have publicly challenged. LCP Delta has warned that poorly designed LDES subsidy could jeopardise up to 20% of projected BESS build-out by depressing balancing and ancillary service revenues for short-duration assets.

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For investors, the practical implication is that the revenue stack for all flexibility assets — BESS, LDES, DSR — is subject to continuing policy risk from market design decisions that are still being made. Duration, location, technology, and commercial structure all affect exposure to this risk differently.

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Getting those choices right — now, before the market structures are locked in — is the difference between an asset that delivers returns and one that underperforms its investment case.

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Flexibility is the backbone of Clean Power 2030. CM Energy Insight helps developers, investors, and utilities position for this market.