Spite your landlord and make your own energy in 1 easy step

A tenant in Berlin can walk into a hardware store and buy a two-panel solar kit for about €300. Hang it on the balcony railing, plug it into the wall socket, and one online form registers it with the grid operator. Start to finish, the process takes about a week. Then the generation starts, saving up to €180 a year on electricity bills. The landlord can't say no. This legal right most tenants are likely unaware of comes from the EU Renewable Energy Directive adopted in 2023. Article 21 requires every member state to allow anyone to generate, store, and sell their own solar power. Germany's 2024 solar package allows landlords to refuse a balcony system only on narrow grounds: a proven safety risk, a serious change to the building's appearance, or genuine structural damage. A landlord who simply dislikes the idea has no case. By the end of 2025, more than 1.2 million of these balcony kits were registered in Germany, and new ones are still arriving at a rate of roughly a thousand a day. The law protects tenants and apartment owners alike, which matters in a country where 53% of the population rents, the highest share anywhere in the EU. But elsewhere, the progress has been much slower. In Spain, solar self-consumption rules were built around large rooftop systems. These require professional installation, formal registration, and, in most apartment blocks, a vote at the building's annual owners' meeting before anyone touches a shared railing or facade. Just outside the EU, the picture is not simple either. Recently changed wiring rules in the UK mean a plug-in kit can be legally connected, but only by a certified electrician wiring it directly into the consumer unit. Plugging the same kit into an ordinary wall socket, the exact step that makes balcony solar quick and cheap elsewhere, remains non-compliant, though the government may clear the way soon.