Poland has changed its grid-connection rules to make it easier for households to pair PV systems with larger batteries, through an amendment to its Renewable Energy Sources Act that also revises the energy law.

From Dec. 1, the rated power of a battery connected with a micro-installation will not count toward the micro-installation’s installed power, as long as the battery’s power is no more than 2.2 times that of the PV system. Combined grid feed-in from the PV system and battery must also stay below the micro-installation’s installed power.

Under the previous rule, storage power was excluded only if it did not exceed the PV system’s power, effectively a 1:1 ratio. Above that, the battery’s power counted toward the microinstallation’s installed power.

The limit applies to rated power in kilowatts, not storage capacity in kilowatt-hours. A 10 kW PV system could therefore be paired with a battery of up to 22 kW, and the provision does not limit energy capacity. Owners will need export controls to keep feed-in below the PV system’s rating. If either condition is not met, the battery’s power counts toward installed capacity as before.

The amendment also requires electricity sellers to give prosumers more detailed monthly information, including grid imports and exports in kWh, the value of exported electricity and their prosumer deposit. It changes rules for energy cooperatives and introduces an auction system for biomethane plants above 1 MW. The act itself does not provide battery subsidies.

The Sejm passed the act on Sept. 4 by 380 votes to 2, with 53 abstentions, and the Senate approved it without amendments on Sept.

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