01 — THE WIND-PLUS-STORAGE CASE
Wind isn’t a curtailment-free generation source anymore. National aggregate curtailment runs single-digit across most European markets, but the picture changes in wind-dense bidding zones during high-generation low-demand hours. German offshore wind saw curtailment peak near 24% of actual production in 2023 — driven by redispatch and heavy congestion episodes. The economics that drove the merchant wind boom now require the operator to either accept the loss or build storage at the same connection point.
Curtailment is the dominant economic loss. ACER and the ENTSO-E Transparency Platform both track curtailment and redispatch trends rising across grid-constrained zones, with Germany taking the heaviest absolute hit and offshore wind absorbing a disproportionate share during redispatch hours. PPAs and CfD contracts typically cover only part of the lost revenue. Storage co-located on the wind farm’s DC link or AC connection captures the otherwise-clipped energy and discharges it back into the grid during higher-priced hours, recovering revenue that would otherwise evaporate at the substation breaker.
Ancillary services have become the second revenue layer. Wind operators bidding into balancing markets need fast-response capacity to qualify for FCR-D, FFR, aFRR, and mFRR. The wind plant alone can’t deliver sub-second response under the ENTSO-E network code requirements that frame these markets. A battery sized for the AC connection point provides that response within the same interconnection envelope — and stacks the revenue on top of the wind PPA without competing with it.
02 — WHAT THE BATTERY DOES
03 — INTEGRATION ARCHITECTURE
Mode A
Mode B
Mode C
04 — SIZING LOGIC
Lever 01 — Energy
Lever 02 · Power
Lever 03 — Duration
Rule of thumb
Onshore wind farm 50–100 MW: typically a 20–40 MWh BESS with PCS sized to the contracted ancillary-services MW commitment. Offshore wind farm 200–500 MW: typically 80–200 MWh distributed across multiple substations, with the architecture choice driven by the offshore platform’s converter topology. These are starting points for feasibility, not engineering numbers — detailed sizing studies factor in TSO interconnection rules, FCR/FFR price curves, and PPA shaping clauses on a project-specific basis.
05 — RECOMMENDED HENLEY PLATFORM
06 — REFERENCE PROJECTS
Note from engineering
The closest direct analogue we’ve shipped to a wind+BESS project is utility solar-plus-storage and PV-storage-diesel hybrids — Inner Mongolia, Ningxia, Hebei, Henan, Shandong provinces in China, plus a Sahel-region microgrid in Chad. Across that deployed portfolio, the platform performance metrics that translate directly to wind+BESS — grid-forming PCS response time (sub-cycle on our containerised platform), curtailment-recovery dispatch logic, ENTSO-E network-code compliance work — are the same hardware and firmware path Henley engineers ship today. The container, the cell stack, the BMS protocol are generation-agnostic.
What we learned on the China utility ESS deployments that transfers directly to wind: the ramp-profile tuning developed for solar-plus-storage during 2023–2024 commissioning rounds maps almost 1:1 to wind-output ramp profiles. The EMS firmware paths for both run on the same dispatch-engine codebase. The curtailment-recovery dispatch logic technical brief is released on request — single-document NDA, not the full bankability package.
Wind-specific commissioned reference projects with our brand on the nameplate are in development across European bidding zones for 2026–2027. Pre-commissioning wind references and engineering studies are shared after NDA on request.
If your project needs a fully wind-deployed reference site with our brand on it as a pre-condition to specification, we’ll say so openly rather than over-promise. Browse current project portfolio →
07 — FAQ
08 — RELATED SOLUTIONS
