GB battery storage · 50 MW / 200 MWh

Example of revenue stacking

50 MW · 200 MWh 4-hour duration
Defaults: GB T-4 2029/30
£27.10/kW/yr · de-rating ≈ 44%
4-hour stress duration · 87% RTE

State of charge across the day

Discharge — sell Charge — buy DC-High (+ overnight charge) CM reserved capacity

The numbers

De-rated capacity

22.0 MW

Fixed CM payment

£594k

≈ £1,627/day

Reserved energy

88 MWh

Daily revenue stack

Morning discharge · 62 MWh+£7,068

Evening discharge · 82 MWh+£9,348

Afternoon charge · 71 MWh−£6,414

Overnight charge · 71 MWh−£5,188

143 MWh bought + 20 MWh absorbed in DC-High to deliver 144 MWh — 19 MWh lost to 87% RTE

Energy arbitrage (net)+£4,814

DC-High availability · 16h × 50 MW+£4,800

Capacity Market (fixed/day)+£1,627

Total per day£11,242

Annualised (identical days)≈ £4.10M/yr

Arbitrage 43% DC-High 43% Cap. Market 14%

De-rating factor (4h)44% → 22.0 MW

CM clearing price£27/kW/yr

Stress delivery duration4 h

Round-trip efficiency87%

Reserve window

Morning sell £/MWh

Evening sell £/MWh

Afternoon buy £/MWh

Overnight buy £/MWh

DC-High £/MW/h

DC-High = Dynamic Containment High — GB's fast post-fault frequency-response service, which absorbs power (charges the battery) when grid frequency rises above 50 Hz.

Arbitrage: sell at day-ahead peak £114/MWh; buy at £90 (pre-peak afternoon) and £72.8 (deep night) — volume-weighted average £81.4/MWh, the implied off-peak. The ~20 MWh absorbed during DC-High activation is treated as free charging (settled via the response service, not wholesale). DC-High rate is an illustrative placeholder; the CM line is the only contracted figure. Round-trip efficiency is applied to purchased volumes. Source: NESO / EMR Delivery Body — Auction Results