New York City wins FERC license for 14-MW hydro project

On May 13, the Federal Energy Regulatory Commission issued an original license to the City of New York for a 14.08-MW hydroelectric project that would tap a reservoir for the city’s water supply.

In February 2012, the city applied for an original license to construct, operate and maintain the proposed Cannonsville Hydroelectric Project. It will be located at the city’s existing Cannonsville Reservoir, on the West Branch of the Delaware River, near the Town of Deposit in Delaware County, N.Y.

Cannonsville Reservoir is located on the West Branch of the Delaware River in New York state’s Catskill Mountains. The West Branch of the Delaware River is the principal drainage channel for the basin and delivers flows from northeast to southwest through a relatively narrow, flat-floored valley. From Cannonsville Reservoir, the West Branch of the Delaware River flows about 18 miles to its confluence with the East Branch of the Delaware River, forming the Delaware River.

The existing 12-foot-diameter conduit leading from the low-level inlet structure to the existing low-level release works building will be tapped with a wye connection to a 12-foot-diameter steel pipe. The 12-foot-diameter pipe will run in a south-to-north direction and will be tapped with four individual wye connections to convey the flow to four individual steel penstocks leading to four turbines.

A new approximately 168-foot-long by 54-foot-wide powerhouse will be constructed adjacent to the existing low-level release works building. The powerhouse will contain four horizontal-shaft, Francis-type turbine-generator units with a total hydraulic capacity of 1,500 cubic feet per second (cfs) and a total station capacity of 14.08 MW. The rated head, based on a headpond elevation at the spillway crest elevation, is approximately 122 feet.

A tailrace will be excavated adjacent to the existing low-level outlet worksbuilding to allow generation flows to connect with the West Branch of the Delaware River immediately below the dam.

From the powerhouse, electricity will run through a 150-foot-long, 12.47-kV underground transmission line, then a 1,200-foot-long overhead 12.47-kV line to a proposed project step-up substation. The interconnection between the substation and the New York State Electric & Gas transmission system will be via a new 460-foot-long, 46-kV overhead transmission line.

About Barry Cassell 20414 Articles
Barry Cassell is Chief Analyst for GenerationHub covering coal and emission controls issues, projects and policy. He has covered the coal and power generation industry for more than 24 years, beginning in November 2011 at GenerationHub and prior to that as editor of SNL Energy’s Coal Report. He was formerly with Coal Outlook for 15 years as the publication’s editor and contributing writer, and prior to that he was editor of Coal & Synfuels Technology and associate editor of The Energy Report. He has a bachelor’s degree from Central Michigan University.