Natural Bridges National Monument Solar Power System
Encyclopedia
Natural Bridges National Monument Solar Power System is a demonstration plant using solar cells as the energy source. Anzovin, item # 2070, p. 90 The first power plant using solar cells was dedicated in the United States on June 7, 1980, by Governor Scott Matheson at Natural Bridges National Monument, Utah, USA.
When it was dedicated in June 1980 by the Utah Governor, it was the world's largest solar plant at 100 kW. It is located in the southeastern portion of the state of Utah
in the United States.
, was a joint venture between the U.S. National Park System, the U.S. Department of Energy, and the Massachusetts Institute of Technology's Lincoln Laboratory. The array of solar panels are located on 1 acre (0.404686 ha) near the park's visitor center. It has an observation platform overlooking the solar cells and recorded narration explaining the function of the facility. Natural Bridges' sunny climate makes it an ideal location for a solar cell power system. Its location far from available commercial power sources was a factor in site selection.
The project cost $15 million ($ in 2010 dollars), but a modern power plant would cost about $1.5 million because of technical advances in solar cell production. The power plant operated for 10 years before it was shut down for overhaul and upgrading. The plant was downsized to 50 kW in 1993 and supplemented with a diesel generator backup system which allows the solar array to operate more efficiently. The same year the restoration project added 18 kW of new solar modules, replaced the battery bank and upgraded the wiring. The existing power plant of solar cells provide 90 percent of the National Park community and visitor facilities electric power needs.
power plant was 40 miles (64.4 km) from the nearest electric line and consisted of 266,029 solar cells arranged in 12 rows. The power plant furnished the electricity for the visitors' center, six staff residences, maintenance facilities, and the local water sanitation system. The system is protected with lightning rods.
There are 39 batteries weighing 1200 pounds (544.3 kg) each with a combined capacity of over 600 kilowatt hours. 450 kWh is enough to operate the park for two days without sun. The solar control system limits the battery drawdown to 480 kWh by activating the diesel generator to increase battery life. The control system selectively sheds from one to 48 solar panels to prevent overcharging the battery system.
Compared to diesel generators providing the same energy, there is an estimated savings of $34,000 per year in diesel fuel and maintenance costs by using a photovoltaic system. Also the environmental benefits include a reduction of air and noise pollution compared to diesel generators. The emissions reductions are estimated to be about 400 pounds (181.4 kg) of sulfur oxides, 2100 pounds (952.5 kg) of nitrogen oxides, 170 short tons (154.2 t) of carbon dioxide, and 250 pounds (113.4 kg) of carbon monoxide annually.
When it was dedicated in June 1980 by the Utah Governor, it was the world's largest solar plant at 100 kW. It is located in the southeastern portion of the state of Utah
Utah
Utah is a state in the Western United States. It was the 45th state to join the Union, on January 4, 1896. Approximately 80% of Utah's 2,763,885 people live along the Wasatch Front, centering on Salt Lake City. This leaves vast expanses of the state nearly uninhabited, making the population the...
in the United States.
History
The power plant, located in Natural Bridges National MonumentNatural Bridges National Monument
Natural Bridges National Monument is a U.S. National Monument located about north west of the Four Corners boundary of southeast Utah, in the western United States, at the junction of White Canyon and Armstrong Canyon, part of the Colorado River drainage...
, was a joint venture between the U.S. National Park System, the U.S. Department of Energy, and the Massachusetts Institute of Technology's Lincoln Laboratory. The array of solar panels are located on 1 acre (0.404686 ha) near the park's visitor center. It has an observation platform overlooking the solar cells and recorded narration explaining the function of the facility. Natural Bridges' sunny climate makes it an ideal location for a solar cell power system. Its location far from available commercial power sources was a factor in site selection.
The project cost $15 million ($ in 2010 dollars), but a modern power plant would cost about $1.5 million because of technical advances in solar cell production. The power plant operated for 10 years before it was shut down for overhaul and upgrading. The plant was downsized to 50 kW in 1993 and supplemented with a diesel generator backup system which allows the solar array to operate more efficiently. The same year the restoration project added 18 kW of new solar modules, replaced the battery bank and upgraded the wiring. The existing power plant of solar cells provide 90 percent of the National Park community and visitor facilities electric power needs.
Characteristics
The 100-kilowatt photovoltaic systemPhotovoltaic system
A photovoltaic system is a system which uses one or more solar panels to convert sunlight into electricity. It consists of multiple components, including the photovoltaic modules, mechanical and electrical connections and mountings and means of regulating and/or modifying the electrical...
power plant was 40 miles (64.4 km) from the nearest electric line and consisted of 266,029 solar cells arranged in 12 rows. The power plant furnished the electricity for the visitors' center, six staff residences, maintenance facilities, and the local water sanitation system. The system is protected with lightning rods.
There are 39 batteries weighing 1200 pounds (544.3 kg) each with a combined capacity of over 600 kilowatt hours. 450 kWh is enough to operate the park for two days without sun. The solar control system limits the battery drawdown to 480 kWh by activating the diesel generator to increase battery life. The control system selectively sheds from one to 48 solar panels to prevent overcharging the battery system.
Compared to diesel generators providing the same energy, there is an estimated savings of $34,000 per year in diesel fuel and maintenance costs by using a photovoltaic system. Also the environmental benefits include a reduction of air and noise pollution compared to diesel generators. The emissions reductions are estimated to be about 400 pounds (181.4 kg) of sulfur oxides, 2100 pounds (952.5 kg) of nitrogen oxides, 170 short tons (154.2 t) of carbon dioxide, and 250 pounds (113.4 kg) of carbon monoxide annually.