Negative prices intensify
Negative prices = over-production: abundant midday wind and solar meet weak demand. The negative intervals ARE the arbitrage opportunity: the more of them, the larger the spread towards the expensive evening peak.
Share of negative Day-Ahead intervals per month · zone IE_SEM · source: our ENTSO-E database.
Who earns what — and where?
Irish market roles, cleanly separated.
Balancing responsible / trader
Reads here when charging is worthwhile: at negative prices, you are paid to charge.
Asset operator
More negative intervals = more economically usable cycles for the battery.
Investor
A rising share of negative intervals widens the business case — without extrapolating from a single month.
Grid operator (EirGrid) / SEMOpx
Negative prices reflect over-production; the market clears the surplus, the transmission operator keeps the grid balanced. No trading profit.
Quality data for imbalance settlement
The potential shown here becomes real revenue only if it can be settled cleanly: revenue-quality metering data and the market settlements decide what is billable. Stromfee builds exactly this layer of transparency.