May 3, 2019: The Low Impact Hydropower Institute has received a complete application for Low Impact Certification of the Canaan Hydroelectric Project. LIHI is seeking public comment on this application. Specifically, we are interested in knowing whether you think the Project meets the LIHI Low Impact Certification Criteria, as revised in the 2nd Edition Handbook. Please review the program and criteria in LIHI’s revised Handbook and then review the Project’s application materials below.
Comments that are directly tied to specific LIHI criteria (flows, water quality, fish passage, etc.) will be most helpful, but all comments will be considered. Comments may be submitted to the Institute by e-mail at email@example.com with “Canaan Project Comments” in the subject line, or by mail addressed to the Low Impact Hydropower Institute, 329 Massachusetts Avenue, Suite 6, Lexington, MA 02420. Comments must be received on or before 5 pm Eastern time on July 2, 2019 to be considered. All comments will be posted to the web site and the applicant will have an opportunity to respond. Any response will also be posted.
The Canaan Hydroelectric Project is located on the northern Connecticut River in the towns of Canaan, VT, and Stewartstown, (West Stewartstown Village) NH. It is situated at river mile 370, 10 miles below Murphy Dam at Lake Francis and 82 miles above Moore Dam. The run-of-river plant is operated automatically as a base load unit generating power whenever adequate river flows are available. The Project is owned and operated by Central Rivers Power NH, LLC.
|Owner||Central Rivers Power NH, LLC|
|Location||River Mile 370 on the Connecticut River in NH and VT|
|Installed Capacity||1.1 MW|
|Average Annual Generation||6,189 MWh
|Facility Type||Run of river|
The concrete gravity dam is approximately 275 feet long and 18 feet tall, located on the Connecticut River in Stewartstown, NH approximately ¼ mile upstream of West Stewartstown Village. A concrete section is located at the south abutment and is 56 feet wide with stoplogs supported by steel stanchions. The main spillway is a concrete gravity, ogee-shaped section approximately 150 feet long and equipped with 3.5 feet high pipe-supported flashboards. A waste gate is located to the right of the main spillway. It consists of a 20-foot wide concrete sluiceway equipped with an electrically operated 15-foot high steel tainter gate.
A steel penstock, 1,360 feet long with diameter of 9 feet, and two steel surge tanks, 15′ 4″ in diameter and 21′ 4″ in height, convey water to the powerhouse located about 200 feet downstream of the surge tanks. These facilities are all located in Canaan, Vermont. The powerhouse contains a single vertical Francis turbine with 1.1 MW capacity.
The bypassed reach is approximately 1,600 feet long and composed of ledge, cobble, and boulders. The current minimum flow requirements under the existing license are to release a 165-cfs minimum flow into the bypassed reach year-round.