Low capture factor and grid stress challenge Poland’s solar growth

As per Pexapark insight, curtailments in Poland reached 400 GWh and solar capture factor fell to 0.54 amid low prices and limited BESS, triggering PSE redispatch.

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Nearly 27 % of solar generation in April was exposed to zero or negative prices for 75 total hours.

Nearly 27 % of solar generation in April was exposed to zero or negative prices for 75 total hours. Image Credit/Source: Gustavo Fring/Pexels

Poland’s solar PV sector has faced significant grid strain in spring 2025 as rapid capacity growth exceeded system flexibility. According to Pexapark, the solar capture factor dropped to a record low of 0.54, with 27% of April generation exposed to negative pricing for 75 hours. Polskie SieciElektroenergetyczne (PSE), the state transmission operator headquartered in Konstancin-Jeziorna, issued redispatch orders on 25 days in April, curtailing 223GWh of solar output. Between January and April, total curtailment reached 400GWh, with preliminary May data showing 1.7GW curtailed on a single day. In 2024, Poland added 4GW of PV, bringing total installed capacity to over 22GW. However, only 200MW of battery storage was operational by mid-2025. To address this gap, 5GW of de-rated BESS capacity has been awarded through recent T-4 Capacity Market auctions and capital support schemes.

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