IE-SEM · battery revenue index
What a battery earns in Ireland (SEM)
The daily BESS revenue index for IE-SEM: perfect-foresight day-ahead arbitrage per MW — the transparent, reproducible ceiling — for standard 1h, 2h and 4h assets, methodology-versioned (BESS-v2) and never restated. Real projects earn less; the explorer haircuts it with your exact efficiency, cycles, availability and degradation — and shows what trading on our forecast (instead of a crystal ball) actually captures.
1h system · last 30 days
€2,912
per MW · avg €97/day
best day: €570 (2022-03-09)
weakest month: €635 (2020-07)
2h system · last 30 days
€5,505
per MW · avg €184/day
best day: €1,140 (2022-03-09)
weakest month: €1,177 (2020-07)
4h system · last 30 days
€9,932
per MW · avg €331/day
best day: €2,095 (2022-03-09)
weakest month: €2,073 (2020-07)
Daily revenue, 2h system · last 90 days · €/MW
Warm bars = strong days, cool = weak — both stay on the record. Peak in window: €427/MW.
How to read these numbers
The index is the arbitrage ceiling: a battery that knew each day's prices in advance, charging the cheapest hours and discharging the most expensive at 90% round-trip efficiency, one cycle per day. It's deliberately simple — simple is auditable, and auditable is the point. Your project's number is lower: forecast error (see the explorer's Volt foresight capture rate), availability, degradation strategy, grid fees. The ceiling's job is to be the stable benchmark those haircuts apply to — comparable across every zone and every year back to 2015, through the 2021–22 crisis the newer indices' histories don't reach.
Where IE-SEM has the data, the API also returns the day's IDA1-arbitrage figure and the FCR/aFRR capacity alternatives — shown side by side, never summed, because the same megawatt can't do both at once. Full method, including what v2 does not model: methodology.
Cite freely with attribution: "Voltcast Battery Revenue Index" + link. Data: ENTSO-E / SMARD (CC BY 4.0) day-ahead auction results.