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Bitdalsdammen
Leirfossene power plant
Leirfossene power plant is located on the Nid River in Trondheim Municipality in Trøndelag County.
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2008Entered into operation
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45 MWInstalled capacity
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145.8 GWhAnnual production
The power plant is equipped with two Francis turbines of 29MW and 16MW respectively.
The power plant uses a gross height of fall of 61 metres. The water is transferred by shaft and tunnel from the intake reservoir Lake Øvre Leirfoss and down to the power plant. From there the water goes through an approximately 1.5 km-long outlet tunnel that discharges downstream in Lake Nedre Leirfoss.
Leirfossene power plant was commissioned in October 2008 after two years of construction. It is built inside the mountain under the Sjetnemarka district of the city and replaced the Øvre Leirfoss and Nedre Leirfoss power plants from 1901 and 1910 respectively.
The two old plants were not demolished, but converted into small power plants that utilize the minimum water discharge that flows in the Nidelva riverbed parallel to the tunnel system for the new Leirfossene plant.
| Company | Ownership share |
| Statkraft | 100% |
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LeirfosseneMikal SveenEntry portal.
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LeirfosseneMikal SveenFrom the construction of the machine room inside the mountain.
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LeirfosseneMikal SveenThe shaft of the one turbine towers inside the cavern in March 2008.
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LeirfosseneMikal SveenAn extensive building process took place inside the mountain. The photo is from June 2008.
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LeirfosseneNorwegian Museum of Hydropower and IndustryCompleted machine room.