Day-ahead market

The day-ahead electricity market is the principal wholesale mechanism by which European power prices are set. Bids from generators and retailers are submitted by midday for delivery in each hour of the following day; the market clears at a single price per bidding zone per hour. On 13 April 2026, day-ahead prices diverged sharply across Europe: Italy cleared at €133/MWh, France at €96/MWh, and Spain at €29/MWh, illustrating how interconnector capacity, generation mix, and gas exposure create radically different price outcomes within the single market.

European day-ahead markets are coordinated through the EUPHEMIA algorithm, administered by EPEX SPOT, Nord Pool, and other exchanges. The single European price coupling (SDAC) mechanism links national day-ahead markets to optimise power flows across borders. Market splitting — where a single bidding zone splits into two when interconnectors are congested — explains the Spain-France-Italy spread visible in April 2026: Spain's surplus renewables and LNG capacity cannot flow north freely.

The day-ahead price is also the reference for many commercial and industrial electricity contracts in Europe. When day-ahead prices in Germany or Italy exceed €100/MWh sustained over weeks, the competitiveness impact on energy-intensive industries becomes severe, triggering the kind of plant closure announcements seen from Ineos and Solvay in 2026.