Hammeren Hydroelectric Power Station (Norwegian: Hammeren kraftstasjon) is a hydroelectric power station located in Oslo Norway. It is the only power station in Oslo and among the oldest power stations still running in Norway. It has a total installed capacity of 5 MW and an annual production of 16 GWh. The powerstation utilises the waterfalls from Skjærsjøen to Maridalsvannet with a total height of 105 m.
