TC Ravenswood LLC filed an Oct. 19 notice with the New York State Public Service Commission, New York Independent System Operator, Consolidated Edison Co. of New York and the New York State Reliability Council that it intends to mothball gas turbines (GTs) 4, 5 and 6 on or about April 30, 2016, depending on the physical status of the units and market conditions.
GTs 4, 5 and 6 commenced operations in 1970. Over the past 24 months, several operational and maintenance issues have occurred, including evaluation and repairs resulting from Hurricane Sandy earlier this decade. These units are reaching end of life unless substantial investment is made to numerous components. Such an investment may or may not be economic depending on market conditions and environmental issues, as well as other considerations including but not limited to various risks associated with operating and maintaining these older units, said TC Ravenswood, a unit of TransCanada Corp. (TSX: TRP) (NYSE: TRP).
GT 7 was previously mothballed after it experienced an over speed condition, high vibrations, a rotor ground and discovery of failed bolts in the turbine rotor first stage section.
TC Ravenswood said it continues to evaluate various components of equipment and has not made a final determination but wanted to ensure sufficient notice was provided with respect to the potential mothballing of these units. TC Ravenswood will notify all the parties to this notice once a definitive decision is made.
The nameplate capacities of these affected units are: GT 4 (21.1 MW); GT 5 (21.1 MW); and GT 6 (22 MW).
The Ravenswood Generating Station, located in Queens, N.Y., is a 2,480-MW plant that consists of 21 units employing steam turbine, combined cycle and combustion turbine technology. Units 10, 20 and 30 are gas/oil-fired boilers, Unit 40 is a dual-fuel capable combined cycle unit, and there are 17 dual-fuel capable combustion turbines.