Mälarenergi AB is a city-owned electric power and district heating provider based in Västerås Sweden. Mälarenergi has around 570 employees and four daughter corporations: Elnät AB Stadsnät AB Försäljning AB and Vattenkraft AB The company owns the grid and produces electricity district heating and cooling with a turnover of 3.0 billion SEK and 145 000 customers as of 2009.