This article studies the implications of the Fourth Energy Package and relevant EU Directives for households and explores their potential benefits in Ukraine. Understanding the effects of energy policies on the residential sector is crucial for promoting sustainability amidst global energy and climate challenges. Methods of descriptive legal studies and investment analysis are used to examine the primary EU legislation on renewable energy communities and citizens’ groups, focusing on their applicability to homes and renewable energy cooperatives. The analysis of Ukraine’s experiences with the adoption of green power and incentives have revealed challenges for small solar home installations operating without the feed-in tariff. Introducing net-billing makes projects unfeasible without such a tariff, and even selling electricity through aggregators on the intraday market does not help. Consequently, the payback period for small installations with batteries becomes unreasonably long (exceeding twenty-five years), while larger facilities have shorter payback termsolytechnic Institute, Ukraine (fifteen to seventeen years). These findings highlight the need for careful consideration of household green-power policies. Implementing the Fourth Energy Package in Ukraine requires measures to address the financial feasibility of small solar installations, particularly those lacking feed-in tariff support. Expanding legislative provisions to include consumers of green power, especially those in multi-apartment buildings, can enhance their participation in the electricity producers’ market. Moreover, raising household electricity prices may be necessary to support sustainable energy practices. Overall, this study underscores the importance of evidence-based policymaking for successful power transitions in homes and the broader energy sector.

There are many financial ways to intensify the construction of new renewable energy sources installations, among others: feed in tariff, grants. An example of photovoltaic grant support in Poland is the “Mój Prąd” [My Electricity] program created in 2019. This program, with a budget of PLN 1 billion, is intended for households in which installations with a capacity range of 2–10 kWp have been installed. During its first edition 27,187 application were submitted. Over 98% of installations cost less than PLN 6,000/kWp. The total installed capacity is 151.3 MWp, which gives the average amount of co-funding per unit of power at the level of PLN 884.7/kWp. The average power of the installation on the national scale is 5.57 kWp, the indicator per 1000 inhabitants is 3.94 kWp, and per unit of area is 0.484 kWp/km2. These installations will produce around 143.5 GWh of electricity annually, contributing to the reduction of CO2 emissions by approximately 109,800 Mg per year. Most applications came from the Silesian Province (3855), which translated into the largest installed capacity of 21.82 MWp, as well as 4.81 kWp/1000 inhabitants and 1.77 kWp/km2 (over 3 times higher than the average in Poland). The installed capacity in the individual province was closely correlated with the population of the province (correlation coefficient – 0.95), while the installed capacity indicator per 1,000 inhabitants with insolation (0.80). The highest power ratio per 1000 inhabitants was achieved in the Podkarpackie Province and amounted to 5.05, and the lowest in the West Pomeranian Province (2.41).