The SEE market now needs a dedicated evening block premium index. Week 25 confirmed that the most commercially important price signal is no longer the average daily baseload price, but the spread between solar-heavy midday hours and the evening delivery window. The critical block is increasingly 18:00–23:00, when solar exits the system while cooling demand remains active.
The logic is straightforward. Solar generation rose 8.1% during the week, helping to soften midday pricing. But wind declined 4.4%, hydro weakened in several markets and thermal output had to rise sharply. That combination created a curve where midday electricity looked relatively comfortable, while the evening market repriced around flexibility.
An evening block premium index would track this transition in real time. It would compare prices between midday hours and evening scarcity hours across Serbia, Hungary, Romania, Croatia, Greece, Bulgaria and Italy. It would show where the highest value is being created for batteries, flexible hydro, gas plants and shaped PPAs.
This index would be particularly useful for renewable developers. A solar project’s merchant revenue will depend increasingly on the difference between the price it captures during production hours and the price the system pays later in the day. A battery’s revenue case will depend on the same spread, but in reverse: charging into weaker daytime prices and discharging into evening premiums.
For industrial buyers, the index would expose the hidden risk inside flat contracts. A buyer may secure annual volume, but still remain exposed to the most expensive hours unless the supply structure includes shaping or balancing. SEE electricity is becoming an hourly market, and the evening premium is its new stress signal.
