Hammeren Hydroelectric Power Station
| Hammeren Power Station | |
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 Location of Hammeren Power Station in Norway
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| Official name | Hammeren kraftstasjon |
| Country | Norway |
| Location | Oslo |
| Coordinates | 59°59′48″N 10°45′00″E / 59.99667°N 10.75000°ECoordinates: 59°59′48″N 10°45′00″E / 59.99667°N 10.75000°E |
| Status | Operational |
| Commission date | 1900 |
| Owner(s) | E-CO Vannkraft AS |
| Pumped-storage power station | |
| Upper reservoir | Skjærsjøen |
| Lower reservoir | Maridalsvannet |
| Hydraulic head | 105 m |
| Generating units | 1 × 5.6 MW |
| Power generation | |
| Units decommissioned | 6 |
| Nameplate capacity | 5.6 MW |
| Capacity factor | 32.6% |
| Annual output | 16 GW·h |
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 power station utilises the waterfalls from Skjærsjøen to Maridalsvannet, with a total height of 105 m. It was established in 1900 by the company Christiania Elektricitetsværk, originally with 4 generator units, and increased to six units in 1901. In 1927 the six generators were replaced by a single 5.6 MW unit.
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