Hennepin Island P-2056

General information

Waterway  Mississippi River
Current status   Active 
Type of facility Conventional Hydro
Mode of hydropower generation Run-of-river
Type of permit FERC License

FERC information

FERC docket # P-2056
FERC project name St. Anthony Falls
Permit issued 3/3/04
Permit expiration 2/24/34

Ownership and operation

Owner Northern States Power Co
Owner type Investor-Owned Utility
Year first online (conventional hydro) 1954
Transmission or distribution system owner Northern States Power Co - Minnesota

Power and generating capacity

Number of units 5
Total capacity from hydraulic turbine-generator units within each plant 13.7 MW
Average annual net hydropower generation 74,531.5 MWH

The hydropower facility includes a transition wall extending from the Corps’ lock structure; a horseshoe dam, spillway and roll dam located across the river and several earthen and concrete dams at various locations to control water flows; a main powerhouse located on Hennepin Island; two underground transmission lines connected to the Main Street substation; and several abandoned hydropower structures that are still listed on the license. The powerhouse includes five turbines with a total capacity of 12.4 megawatts, which is enough to provide power to 10,800 households.

The original hydropower license was granted on September 6, 1951, to the St. Anthony Falls Water Power Company. The license was transferred shortly thereafter to Northern States Power Company. The original license included a 16-megawatt Lower Falls. In 1956, a 12.4-megawatt Upper Development hydropower facility at Upper St. Anthony Falls was added to the license. In 1987, the Lower Development hydropower plant failed and has since been removed from the license. The license was reissued on March 8, 2004, for a period of 30 years and only includes the 12.4-megawatt upper development.

In December 2003, FERC, the Advisory Council on Historic Preservation, and the Minnesota State Historic Preservation Officer signed a programmatic agreement for managing the historic properties affected by the hydropower license.

Source: USACE

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