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The change could expand backup power and load-shifting options.
Photo Credit: iStock
A new rule in Poland will let households with rooftop solar panels add larger home batteries without automatically having that extra battery power counted toward the system size used for grid connections.
Effective December 1, an amendment to Poland’s Renewable Energy Sources Act will keep a battery connected to a micro-installation out of the installation’s counted power total if two conditions are met: The battery’s rated power is no more than 2.2 times the photovoltaic system’s power, and total power sent to the grid remains below the solar system’s rating, ESS News reported.
In practice, that replaces the earlier setup, which only excluded storage when its rated power stayed at or below the solar array’s rating.
Because the limit is defined by rated output in kilowatts rather than energy storage in kilowatt-hours, a 10-kW photovoltaic system can be matched with a battery rated up to 22 kW.
For homeowners with a 10-kW array, the change could expand backup power and load-shifting options.
Adding battery storage is one of the best ways to protect your home during outages, save money on energy, and gain more energy independence. If you’re comparing options, EnergySage can help you explore home battery storage choices and competitive installation estimates, and EnergySage has teamed up with electrification brand Qmerit to help homeowners get the best price on home battery storage solutions.
If the battery is larger than 2.2 times the photovoltaic system’s rated power, or if exports from the battery and solar system together rise above the photovoltaic system’s rating, then the earlier framework applies again, and the battery’s power is added back into installed capacity.
Under the amendment, electricity sellers must also give prosumers — those who consume and produce energy — a more detailed monthly breakdown: how much power they drew from and sent to the grid in kilowatt-hours, what their exported electricity was worth, and their running prosumer-deposit balance.
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For households on net billing, that added reporting could make it easier to understand how much value their solar-plus-storage setup is delivering.
The update follows Poland’s June retreat from separate building rules that industry groups said would have constrained battery storage for homes and businesses.
A larger battery can also help households store more midday solar generation for later use instead of buying electricity back in the evening. Separately, the Ministry of Climate and Environment’s storage support may cover as much as 30% of battery expenses for qualifying systems, with a cap of PLN 800 ($203) per kWh.
Poland’s Parliament, the Sejm, passed the act on September 4 by a vote of 380 to 2, with 53 abstentions, and the Senate later approved it without amendments on September 24. 
The act itself does not create battery discounts, but the ministry is separately launching a PLN 1 billion ($256.9 million) home storage subsidy. Applications open October 20, and the program is limited to batteries of at least 10 kWh.
In the sixth round of the Mój Prąd rebate program, storage accounted for 60% of applications.
In the U.S., one company offering strong battery backup options is Pila, whose plug-and-play batteries are priced at a fraction of what a whole-home backup system would cost. That means homeowners have multiple ways to think about storage, from larger fixed systems to lower-cost backup options.
Government projections indicate that if 20% of new net-billing prosumers install batteries up to the new limit, total connected storage power would reach about 3.7 gigawatts by the end of 2029.
Poland isn’t the only place where changes to solar rules and battery economics are reshaping homeowners’ decisions. 
• In Connecticut, lawmakers gave home batteries a major advantage as rooftop incentives faced new caps.
• U.S. net metering changes made a home battery hard to justify in many states.
• More homeowners are pairing solar panels with batteries, and the benefits are enormous.
• For solar households, batteries save even more money when local export-credit rules are less generous.
• EnergySage can help homeowners compare solar panel costs as installation decisions grow more complicated.
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© 2025 THE COOL DOWN COMPANY. All Rights Reserved. Do not sell or share my personal information. Reach us at hello@thecooldown.com.

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