Norway, like Germany, Austria and Switzerland uses single phase 15 kV AC railway electrification at 16 2/3 Hz (precisely) for electric train systems. However there are differences in the supply of power. Nearly all power is derived from rotary converters or static inverters in the substations, which are fed with three-phase AC of 50 Hertz from the public grid. There are only two power stations generating single phase AC. That at Kjofossen, feeds its power directly in the overhead wire, while that at Hakavik supplies a small 55 kV single phase AC network, which feeds five substations. However at two substations, there are also converters. In earlier days, Nygårds Hydroelectric Power Station delivered single phase AC for line between Narvik and Kiruna. The single phase AC line running to Sweden is now used between and as the 15 kV line for feeding the overhead wire.
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From Haugevik Power Plant, two 55 kV long single phase AC powerlines depart, one to Sande and the other to Sundhaugen Switching Station. At Sundhaugen Switching Station, the lines depart: one over Skollenborg railway substation and Noragutu Substation to Neslandsvatn Substation and the other to Asker substation, which has an interesting track. It runs from Sundhaugen Switching Station northward and shares north of Foss at the towers of a three phase AC lines. It runs then eastwards and passes three substations:
South of Ulvenvn substation at , it runs again on own towers overhead until termination tower at . The rest of line is underground.
| Name | Town | Power | Year of inauguration | Coordinates |
|---|---|---|---|---|
| Hakavik | Øvre Eiker | 7 MW | 1922 | |
| Kjofossen | Sogn og Fjordane. | 3.5 MW | 194? |
| Place | Coordinates |
|---|---|
| Asker | |
| Neslandsvatn | |
| Nordagutu | |
| Sande | , east of powerline crosses railway line at |
| Skollenberg |
| Place | Coordinates |
|---|---|
| Sundhaugen |
In Norway nearly all railway substations uses motor-generators which converts three phase AC from public grid into single phase AC. Most of these device are mounted on rail-cars for quick replacement. Some substations are in blind-ending tunnels.
The list may be incomplete and coordinates may be incorrect.
| Place | Technology | Power | Year of inauguration | Coordinates |
|---|---|---|---|---|
| Alnabru | ||||
| Asker | ||||
| Bergen | ||||
| Dale | ||||
| Dombas | ||||
| Fåberg | ||||
| Fron | ||||
| Ganddal | ||||
| Haugastøl | ||||
| Holmlia | ||||
| Hønefoss | ||||
| Jessheim | ||||
| Kielland | ||||
| Kongsvinger | ||||
| Krossen | ||||
| Larvik | ||||
| Leivoll | ||||
| Lillestrøm | ? | |||
| Lundamo | ? | |||
| Lunner | ||||
| Mjøllfell | ||||
| Narvik | ||||
| Nelaug | ||||
| Neslandsbyen | ||||
| Nordagutu | ||||
| Otta | ||||
| Rudshøgda | ||||
| Sarpborg | ||||
| Sira | ||||
| Smørbekk | ||||
| Ski | ||||
| Skoppum | ||||
| Stavne | ||||
| Tangen |