Island Falls Generating Station (38 MW) - Smooth Rock Falls: Abitibi 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 Island Falls Generating Station is a four-unit hydroelectric station located on the Abitibi River in Tolmie and Menapia Townships. The station was built in 1925, with two of the four units operating at 25 Hz. In 1996, the station was modernized and all units were converted to 60 Hz operation. The station has an installed capacity of 40 MW at a head of 20.5 metres.

Located 30 km north of the confluence of the Abitibi and Frederickhouse Rivers, the station is a run-of-river plant. Local storage capability allows a moderate level of peaking performance during all but freshet conditions. Operation pertaining to levels and flow are governed under the 2004-2014 Abitibi River Water Management Plan. The site is restricted by a maximum water elevation due to flood constraints and a summer minimum elevation to respect navigational constraints. Operation of the station is primarily coordinated with Iroquois Falls GS upstream and other area storage facilities. The station is subject to a daily average minimum flow of 10 m3/s for fisheries concerns. The station is remotely controlled from the H2O Power LP Operating Center in Oshawa.

The Island Falls station is categorized as close coupled, and has no penstocks. The station consists of a powerhouse, a concrete gravity section containing the spillway and sluice gates, and a short earth section. Each unit has two head gates, which are powered by an overhead crane. Four screw operated motorized sluice gates allow the passing of excess flows. There are ten bays of stop logs, which are handled by two mechanical lifters. The station has a unique feature known as an ejector gate which is installed on each turbine, and can each pass an additional 30 m3/s flow when inflows are in excess of normal turbine capacity. The head pond operates between the minimum elevation of 215.03 metres and maximum elevation of 215.28 metres.

Island Falls is connected to the existing Hydro One 230kV circuit A931 and connects to Ansonville TS.

This hydroelectric generating station generates approximately 260,000 MWh of renewable energy per year.

Location: Smooth Rock Falls, ON
River System: Abitibi River
Nameplate Capacity: 40 MW
OPA Contracted Capacity: 38 MW
Operator: H2O Power LP
Technology: Hydroelectric, intermediate run-of-river
Turbines: Four vertical Francis turbines
Originally Built: 1925
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