The number of consumers producing electricity at home, i.e., “prosumers”, is rapidly increasing in many European countries. This article analyses the electricity consumption and energy-saving behaviours of households that own photovoltaic (PV) systems in Sweden. Earlier studies of how home production of electricity affects consumption patterns are few and their results are mixed. We interviewed prosumers in Sweden and collected electricity-consumption data one year before and after they installed PVs. The differences between households were large and no general behavioural change could be detected. The interviews indicated that awareness of the energy system increased among all prosumers, but led to no substantial changes in how or when activities were performed. Most prosumers thought that the benefits of shifting their electricity load to other times were too small. The changes prosumers did make mostly concerned smaller adjustments. Households that increased their consumption justified this by their access to “free” electricity. Automation, i.e., using a timer, was relatively unknown or not used when known.