TransCanada has completed rehabilitating 32.4-MW Vernon Station, replacing four of ten turbines and increasing generation at the station, on the Connecticut River in Hinsdale, N.H., and Vernon, Vt.
TransCanada initiated the program because the four units were inoperable due to wear and aging. In addition, the company said the original design made it difficult to obtain access to turbine components for maintenance and repair.
TransCanada said the four new 4-MW units ï¿½- brought on line in December 2007 and January 2008 — allow increased generation during periods of high flow. All four new units now generate power for the New England transmission grid. TransCanada said the cost of the 16-MW repowering exceeds $50 million.
The rehabilitation program also included installation of a new overhead crane, new intake and draft tube gates, trashrack repairs, and upgrades to switchgear. Gerace Construction installed that equipment, TransCanada said.
TransCanada seeks tax credits for incremental generation
TransCanada filed an application with the Federal Energy Regulatory Commission July 23 asking FERC to commission certify incremental generation from replacing the four turbines at the project (No. 1904) for federal production tax credits.
With the four units operational, TransCanada said it anticipates an average annual generation of 191,854 MWh directly as a result of replacing the turbines. That figure compares to a baseline average annual generation of 135,453 MWh, or an increase of 56,401 MWh. The percentage of the future anticipated annual average generation due to the unit repowering is 29.4 percent, TransCanada said.