How a battery earns in Slovakia

Slovakia's grid is run by transmission operator SEPS (Slovenská elektrizačná prenosová sústava), while OKTE, a.s. operates the day-ahead market as the Slovak bidding-zone NEMO — coupled with the Czech and wider CORE region and now moving to 15-minute settlement. The system is capacity-constrained: SEPS added 763 MW in July 2024 to open roughly 2,600 MW for new generation, yet connection queues and multi-year lead times persist as solar climbs (+243 MW in 2025, 1,357 MW cumulative). There is no dedicated standalone-battery subsidy; instead storage is eligible under the EU Recovery & Resilience Facility RES call (up to €64 million), with grid tariffs and charges set by the regulator ÚRSO. Against this backdrop a battery's core revenue is arbitrage: the 30-day day-ahead spread averaged about €168/MWh — roughly 140% of the average price — the value a well-timed charge × discharge cycle can capture, on top of FCR/aFRR balancing markets SEPS joined in 2024.

€168/MWh

day-ahead spread — 140% of the average price (30 days)

€64million

EU Recovery & Resilience RES call — batteries eligible (no standalone-BESS scheme)

2,600MW

grid capacity opened for new generation by SEPS (+763 MW in Jul 2024)