Calm Lake Generating Station (9 MW) - Bennett Township: Rainy River

On January 1, 2015, the Ontario Power Authority merged with the Independent Electricity System Operator to create a new organization that combines the OPA and IESO mandates.

Please note that the information on this page is not current and will not be updated. A new format for contract data will be published soon.

The Calm Lake Generating Station is a two-unit hydroelectric station located on the Seine River at the outlet of Calm Lake. The station was originally built in 1928, both turbine runners were replaced in the 1960’s, both generators were rewound in the mid 1980’s, and the main transformer and associated electrical equipment were replaced in 2006. The station has an installed capacity of 9.4 MW at a head of 24 metres.

Located 120 km east of the town of Fort Frances, the station is a run-of-river plant. Operation pertaining to levels and flow are governed under the 2004-2014 Seine River Water Management Plan. The plan specifies the rule curve elevations and flow requirements for the Seine River, including storage dam operations at Raft Lake which is the primary storage point on the river. The station is subject to a minimum flow of 2.5 m3/s at all times, and an instantaneous minimum flow of 10 m3/s during the period from April 15th to June 15th. The station is remotely controlled from the H2O Power LP Operating Center in Oshawa.

The Calm Lake station is categorized as close coupled, and has no penstocks. The station consists of a powerhouse and a concrete gravity section containing the spillway. Each generating unit is provided with two head gates, which are operated by an electrical screw hoist. There is a sluice gate on the spillway, fifteen bays of stop logs on the spillway, and a hydraulic log lifter for log handling. The headpond operates between the minimum elevation of 382.2 metres and maximum elevation of 382.75 metres.

Calm Lake is connected to the IESO grid at Calmlake-115.T1 on circuit M1S.

This hydroelectric generating station generates approximately 55,000 MWh of renewable energy per year.

Location: Bennett Township, District of Rainy River, ON
River System: Seine River
Nameplate Capacity: 9.4 MW
OPA Contracted Capacity: 9 MW
Operator: H2O Power LP
Technology: Hydroelectric, run-of-river
Turbines: Two vertical Francis
Originally Built: 1928
OPA Contract Term Commencement Date: December 1, 2009




Project Contacts:

Ontario Power Authority

Media and Public Relations
T. 416-969-6307 or

H2O Power LP
Marc Mantha
Vice President, Operations
T. 905-438-8539 Ext 203