The dam includes five electric generating units with a collective capacity of 583,300 kilowatts (kW).
The electricity generated by the Garrison Dam is marketed through the Western Area Power Administration (WAPA)
. WAPA is one of four power-marketing administrations within the U.S. Department of Energy
Minnkota has been purchasing Garrison Dam power from WAPA since 1955. Currently, Minnkota has an allotment of energy from the project equivalent to approximately 109,000 kW.