
Flatenfoss is situated between Nelaug and Bøylefoss in Nidelva (the Arendal river). The power plant came in to operation in 1927.
Flatenfoss 2
Flatenfoss 2 was commissioned in 1981. The station has a horizontal Kaplan turbine.
- Intake: Nidelva river
- Height of fall: 10 m
- Generator: 1 set
- Nominal water flow: 60 m3/s
- Installed capacity: 5.5MW
- Average annual production: 35 GWh
Flatenfoss 3
Flatenfoss 3 came in to operation in 2009, replacing the earlier power plant Flatenfoss 1. The plant has a vertical Kaplan turbine.
- Intake: Nidelva river
- Height of fall: 10 m
- Generator: 1 set
- Nominal water flow: 80 m3/s
- Installed Capacity: 7.1MW
- Average annual production: 45 GWh

- Kontakt
- Jan Roald Evensen, Plant Manager: +47 900 60 164
- Operations Center: +47 900 60 161
- Morten Henriksen, EVP at AFK