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Northfield Mt. Hydro-Electric Facility - FirstLight Power Resources

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The powerhouse was built entirely underground and located about 5.5 miles (8.9km) up the Connecticut River from Turners Falls Dam. A stretch of the Connecticut River, extending some 20 miles (32km) north from this dam to the Vernon Dam, Vermont, serves as the station's lower reservoir. During periods of lower electrical power demand, the plant pumps water from this lower reservoir through the Northfield Mountain Tailrace Tunnel to a man-made upper reservoir. At times of high demand, water is released to flow downhill from this upper reservoir through a turbine generator, where it then collects in the lower reservoir to be stored until again pumped to the upper reservoir. Northfield Mountain's upper reservoir covers 300 acres (120ha) at 800 feet (240m) above the river, with total storage of 5.6billion US gallons (21Gl) of water. Its underground powerhouse lies at 700 feet (210m) below the surface and is accessible through a 2,500-foot (760m)-long tunnel; it includes four large reversible turbines, each of which can pump 15,200 cubic feet (430m3) of water per second and release 20,000 cubic feet (570m3) of water per second to generate 1,143 megawatts (1,533,000hp) of electricity. The turbines can ramp up in 10 minutes and deliver full power for 8 hours. Source: Northfield Mountain (hydroelectricity facility) -Wikipedia
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>>> The date of the item is in the File Name, i.e., 1eg67nfmt.jpg >>> the number in the name (67) is the year of the image . . . 1967.