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Avery
The Avery Dam is a 435kW hydroelectric project located on Opechee Bay in the center of Laconia, New Hampshire. The powerhouse, constructed in 1986, contains a variable pitch E7650R Flygt turbine and one fixed blade E7620 Flygt turbine.
Brighton
The Brighton Project is located on the Patuxent River near Laurel, Maryland at the outlet of the Triadelphia Reservoir. The Triadelphia reservoir, with a storage capacity of approximately 19,500 acre-feet, is fed by two major tributaries: the Upper Patuxent and Cattail Creek. The dam is a 995-foot-long, 55-foot-high rockfill buttress dam built in the 1940’s. The spillway section of Brighton Dam has thirteen Tainter gates, each 15 feet high. There are two turbine-generator sets, each with a 187-kW rating at 50 cubic feet per second and 52 feet of head.
Brockway
The Brockway Project is located on the Williams River near Chester, Vermont. The Project works consist of: a 135-foot-long and 15-foot-high concrete dam with a 107-foot-long ogee spillway section with provisions for 3-foot-high flashboards; an intake structure located just upstream of the dam at the right river bank; a 406-foot-long penstock; a powerhouse containing a single Ossberger cross-flow turbine, with two guide vanes, rated 564 kW and connected to a synchronous generator; a tailrace returning flow to the Williams River approximately 300 feet downstream of the dam; 400 feet of underground transmission line; and appurtenant facilities. The Project was constructed in 1984.
Burt Dam
Burt Dam Project is located on the Eighteen Mile Creek in Niagara County, New York. The Project consists of a concrete dam approximately 328 feet long with a maximum height of approximately 59.5 feet. The concrete dam consists of the following structures: a left and right non-overflow section, an ogee overflow spillway, and the intake/powerhouse structure. The concrete powerhouse is located on the downstream face of the right non-overflow spillway and contains a single vertical Francis turbine-generator unit rated 600 kW. The rated head and discharge of the turbine are 46 vertical feet and 215 cfs, respectively. The project was originally placed in-service in 1924 but received a major overhaul and FERC exemption in 1987.
Campton
The Campton Project consists of a dam and a three-unit powerhouse with a total nameplate capacity of 766 kW. The project operates as an automated run-of-river facility. The dam, owned by the U.S. Forest Service and is leased to Relevate Power under a Special Use Permit, is a reinforced concrete gravity structure approximately 341 feet long, with a maximum structural height of about 37 feet above the foundation. The spillway ogee section is 151 feet long. It contains a 36-inch-diameter mud gate, which has been used to drain the pond as required. This dam was constructed in 1935 by the Civilian Conservation Corps for recreational purposes, replacing a timber crib structure owned and operated in the 1800’s. The project intake feeds a 78-inch steel penstock running 600 feet downstream to the powerhouse, where it trifurcates to feed each turbine.
Collins
The Collins Hydroelectric project is a 1.5MW facility located on the Chicopee River in the towns of Ludlow and Wilbraham, Massachusetts. Collins Dam is located at River Mile 12.6 between the upstream Red Bridge Dam and Putts Bridge Dam. The Project includes an approximate 430-foot-long dam that consists of (from right to left): a 56-foot-long spillway section; an approximately 40-foot-wide concrete intake/generating station with trashracks, two hydraulically operated concrete stoplog panels, two submerged ESAC bulb turbines, an elevated control room, and two concrete dewatering panels for the draft tubes; and an approximate 334-foot-long spillway section with four concrete piers dividing the spillway into five spans approximately 64 feet long.
Dundee
The Dundee Project, originally constructed in 1913, is located on the Presumpscot River in Cumberland County, Maine. Dundee is one of five individual hydroelectric plants on a 9-mile stretch of the Presumpscot River at the outlet of Sebago Lake in southwestern Maine.The project includes: a 1,492-foot-long dam, a powerhouse containing three horizontal turbine-generators, a bypass reach, a tailrace channel, and an eel lift. The dam is comprised of: a 175-foot-long, 50-foot-high earthen east (left) embankment; a 1,050-foot-long, 50-foot-high earthen west (right) embankment; a 90-foot-long concrete non-overflow section; a 150-foot-long, 42-foot-high concrete spillway; and a 27-foot-long gated concrete canal intake structure. A 1,075-foot-long bypass reach exists between the dam and the downstream end of the tailrace channel. The tailrace channel is 1,075 feet long, 30 feet wide, and 11 feet deep.
Eel Weir
The Eel Weir Project is located on the Presumpscot River at the outlet of Sebago Lake in the towns of Windham and Standish, Maine. Eel Weir is one of five individual hydroelectric plants on a 9-mile stretch of the Presumpscot River at the outlet of Sebago Lake in southwestern Maine. The project headgates were installed in the mid-1800s at the outlet of Sebago Lake and the generating facilities were later commissioned in 1903. The project includes: a 1,350-foot-long dam; a 900-foot-long non-overflow concrete retaining wall and earth-fill east (left) embankment; a 115-foot-long, 22-foot-high stone masonry and concrete spillway; a 35-foot-long, 17-foot-wide stone masonry and concrete river gatehouse with five 6.4-foot-high, 4.8-foot-wide wooden gates; a 260-foot-long stone masonry and earth-fill west (right) embankment; a 90-foot-long fish screen with ¾-inch clear-bar spacing located immediately upstream of the canal intake gatehouse; a 40-foot-long, 19-foot-high canal waste gate structure with three 17-foot-wide, 11-foot-high steel slide gates; a minimum flow gate located within each steel slide gate; a powerhouse containing three horizontal Hercules turbines with a total installed capacity of 1.8 MW; and a 3.5-mile-long 11 kV transmission line.
Forestport
The Forestport development is located at the confluence of the Black River and Alder Creek and consists of two separate impoundments, the Black River reservoir and Alder Pond. The Black River Reservoir is directed to Alder Pond through a short feeder canal. Alder Pond is then channeled to the Black River Feeder Canal, which was originally constructed as a feeder for the Erie Canal to transport lumber, and then to the facility’s intake. The powerhouse contains a single 3.30-MW generating unit.
Gambo
The Gambo Hydroelectric Project is located on the Presumpscot River in Cumberland County, Maine. The site was originally developed as a sawmill in the 18th century. In 1912, the current dam was constructed. Gambo is one of five individual hydroelectric plants on a 9-mile stretch of the Presumpscot River at the outlet of Sebago Lake in southwestern Maine. The project includes a dam, spillway, canal intake, powerhouse, two turbines, bypass reach, and upstream eel passage facilities. The dam is a 300-foot-long, 24-foot-high reinforced concrete structure, consisting of a 250-foot-long overflow section. One-foot-four-inch-high wooden flashboards exist on the spillway section of the dam. The canal intake structure is 50 feet long leading to a sluice gate structure and a 737-foot-long, 15-foot-deep concrete-lined intake canal. The powerhouse is a concrete and brick structure containing two identical vertical Francis turbines direct-connected to generators with a total installed capacity of 1.9 MW.
Little Falls
The Little Falls Hydroelectric Project is located on the Presumpscot River in Maine and is the fifth hydro project downstream of the Sebago Lake outlet. The project includes the dam, intake structure, powerhouse, four vertical Francis turbines, a bypass reach, and upstream eel passage facilities. The dam is a 331-foot-long, 14- foot-high, reinforced concrete and masonry structure incorporating a 160-foot-long spillway section, a 101.5-foot-long spillway and sluice gate section, and a 70.5-foot-long intake structure. A mid-century modern masonry powerhouse and office is also integral to the dam. It contains four vertical Francis turbines direct-connected to generators with a total installed capacity of 1 MW.
Mallison Falls
The Mallison Hydroelectric Project is located on the Presumpscot River in Maine and is the sixth hydro project downstream of the Sebago Lake outlet. The project site has been used for a variety of manufacturing purposes since c. 1740, but the site was developed specifically for hydroelectric generation in the early 1900s to power the local paper mill. The project includes: the dam, intake canal, powerhouse, two turbines, and upstream eel passage facilities. The dam is a 358-foot-long, 14-foot-high diversion structure, consisting of a 113.5-foot-long cut granite spillway section, a 174.5-foot-long reinforced concrete spillway section, and a 70-foot-long canal headgate structure with five gates. The intake canal is 675 feet long, 41 feet wide, and six feet deep. The powerhouse contains two identical vertical Francis turbines directly connected to synchronous generators with a total installed capacity of 0.8 MW.
Mill Pond
Mill Pond is located on the Catskill Creek in Leeds, New York. The facility was constructed in 1988 at an existing dam with used, but robust, components from the early 1900s. The Project includes: a 4-foot-high, 165-foot-long dam; an intake structure; penstock; and powerhouse with two identical generating units. Mill Pond has an installed capacity of 1,000 kW and produces 2.24 Gigawatt hours (GWH) of energy per year, on average.
Mount Ida
The Mount Ida generating station, constructed in 1983, is located on Poestenkill Creek in Troy, New York. It consists of a low-hazard timber A-frame type dam, reinforced intake structure, a water conveyance tunnel, and powerhouse. Water is diverted from the streambed at the top of Poestenkill Gorge, a 160 foot natural rockfall, and channeled through a 525-foot-long underground rock tunnel and a 775-foot-long reinforced concrete/steel penstock, before falling into a 94-foot-deep reinforced concrete caisson that contains (2) 1,460 kW Boving Francis turbines.
Pine Valley
The Pine Valley Hydroelectric Project consists of a concrete gravity dam and a generating station located on the Souheagan River in Milford, New Hampshire. The generating station contains two 292 kW Camel Back Francis turbine-generator units. The dam is 200 feet long and 23 feet high and utilizes wooden flashboards. The project was constructed and put in service in 1912.
Rochester
The Rochester Project is located on the Cocheco River in Rochester, New Hampshire. The project consists of a 20-foot-high and 106-foot-long concrete gravity dam with a maximum storage capacity of seven acre-feet, a 72-inch-diameter and 285-foot-long riveted steel penstock, a powerhouse containing a single 184 kW horizontal Francis generating unit with a hydraulic capacity of 85 cfs, and a 400-foot-long transmission line.
Sebec
The Sebec Hydroelectric Project is aptly located on the Sebec River at the outlet of Sebec Lake in the Town of Sebec, Maine. The spillway is a roughly “Z” shaped stone-filled timber crib structure with a reinforced concrete cap. The total hydraulic length of the water impounding structures is 276 feet, including: a 20-foot-long concrete abutment section on the left (north) end, a 178-foot-long spillway (constructed in three sections), a 20-foot-long fish passage structure, and a powerhouse, which forms the right abutment. The maximum dam height is 15 feet. Wood flashboards are installed across all three spillway sections. The powerhouse contains two semi-Kaplan bulb turbine-generator units, one with a 550 kW capacity and the second with a 317 kW capacity. Water is channeled to the powerhouse via a 60-foot-long, 30-foot-wide, and 14-foot-deep forebay canal and controlled at the powerhouse by two 10-foot by 11-foot hydraulically operated slide gates. The original timber crib dam was constructed pre-1882 and was reconstructed in 1920. The original powerhouse (built circa 1920) burned down in 1940, and a new powerhouse was constructed between 1984 and 1985.
Steels Pond
The Steels Pond Hydroelectric Project is located on the North Branch of the Contoocook River in New Hampshire. The Project consists of a 173-foot-long and 20-foot-high concrete gravity dam impounding a reservoir (Steels Pond) with negligible storage capacity; headgates; a 66-inch-diameter and 1,550-foot-long steel penstock; a powerhouse with five turbine-generators; a 1,100-foot-long transmission line; and other appurtenances. One of the five turbine-generators has a 75 kW capacity, two have 150 kW capacities each, and the last two have 300 kW capacities each. All turbines are of a fixed guide vane, propellor type.
Tannery
The Tannery Project is located on the Black River in Carthage, New York. The Project works consist of three separate dams: Tannery Dam "A” - a 14-foot-high, 125-foot-long timber crib dam with concrete cap; Spicer Dam "B” - a 6-foot high, 115-foot-long concrete gravity dam; and Spicer Dam "C” – a 6-foot high, 290-foot-long concrete gravity dam. The project contains a 50-foot-long by 36.5-foot-wide open-flume-type powerhouse structure containing five Flygt submersible-type turbine/generators having a generating capacity of 1,875 kW at 15.8 feet net head.
West End
The West End Hydroelectric Project is located on the Black River in Carthage, New York. The project works consist of a 1,500 foot long, low-hazard dam with an uncontrolled spillway, a non-overflow concrete wall section, a sluice gate, and a powerhouse with an integral intake. The Powerhouse is a concrete structure containing two turbine-generator units with a total capacity to generate 5.0 MW, and an overhead crane. The uncontrolled spillway is 1,300 feet wide and 18 feet tall with a crest elevation of 702.0 feet. It extends to the right power canal wall of the Lathrop Project (P-4636-NY) located along the left bank of the Black River. These projects each control and maintain the structures within their respective project boundaries.
Weston
The Weston Dam Project is located on the Upper Ammonoosuc River in the Town of Groveton, New Hampshire. The Project consists of a concrete-covered stone and timber crib dam with an overall height of 18 feet without flashboards. Metal-hinged flashboards on the spillway crest raise the reservoir level by another 4.6 feet (to the normal pool elevation of 867.7 feet). The Project has an overall width of approximately 200 feet, which includes a 120-foot-wide spillway, four hydraulically-operated flood gates, and two turbine inlet gates located upstream of the powerhouse structure that supply two double-regulated Kaplan turbines inside the powerhouse. The Unit 13 generator has a capacity of 243 kW and the Unit 15 generator has a capacity of 325 kW. The transmission line is 480 Volts (V), which is stepped up by three pole-mounted 250 kVA transformers. Co-located on the site is a 45-kW solar array that provides power of plant service.
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