FERC issues permit for two-part hydropower project in New Hampshire

On Feb. 23, the Federal Energy Regulatory Commission approved an October 2015 application from Grafton Hydro LLC for a preliminary permit, good for three years, covering work to study the feasibility of the proposed Lebanon-Mascoma Project, to be located on the Mascoma River in the city of Lebanon, Grafton County, New Hampshire.

The proposed project would include two developments. Development 1 would be located near the city of Lebanon and Development 2 would be located approximately five miles upstream of Development 1 at the existing Mascoma Lake dam.

  • Development 1 would consist of: a new 110-foot-long, reinforced concrete dam with a 60-foot-long, bottom-hinged, operable crest spillway; a new impoundment with a surface area of less than 2 acres and a normal volume of less than 10 acre-feet; a 1,200-foot-long, 7-foot-diameter steel penstock; a new 40-foot-long, 30-foot-wide reinforced concrete powerhouse containing a new 2,000-horsepower Kaplan-type turbine and a new 1,500-kW synchronous generator; and an approximately 500-foot-long transmission line connecting the generator to a 2.0-kilovolt amp (kVA) transformer.
  • Development 2 would consist of: the existing 18-foot-high, 575-foot-long concrete, gravity Mascoma Lake dam with four 6-foot-wide outlet gates, seven 35-foot-wide stop-log bays, and a 125-foot-long overflow spillway; the existing 1,158-acre Mascoma Lake impoundment; a new 40-foot-long, 30-foot-wide reinforced concrete powerhouse containing four 150-horsepower, horizontal axis, propeller-type turbines, each with a 150-kW asynchronous generator; and an approximately 500-foot-long transmission line connecting the generators to a 1.0-kVA transformer.

The purpose of a preliminary permit is to preserve the right of the permit holder to have the first priority in applying for a license for the project that is being studied. During the course of the permit, the commission expects that the permittee will carry out pre-filing consultation and study development leading to the possible development of a license application.

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.