This dataset has been collected in context of the domOS H2020 project (https://www.domos-project.eu/). The dataset includes data about the electricity consumption of 15 single-family residential households all located around Sion (Switzerland), in the OIKEN service area (https://oiken.ch). All the households are equipped with an individual heat pump providing energy for both space heating and domestic hot water. The ongoing data collection began in January 2021 and includes the households’ total electricity consumption provided by the Smart Meter. It also includes the specific consumption of the heat pump and the production of the solar panels (where applicable) provided by dedicated sub-meters.