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1 day ago · Onshore wind cost per kilowatt-hour between 1983 and 2017 [87] Onshore wind is an inexpensive source of electric power, cheaper than coal plants and new gas plants. [ 9 ] According to BusinessGreen , wind turbines reached grid parity (the point at which the cost of wind power matches traditional sources) in some areas of Europe in the mid-2000s, and in the US around the same time.
1 day ago · The solar constant is equal to approximately 1,368 W/m 2 (watts per square meter) at a distance of one astronomical unit (AU) from the Sun (that is, at or near Earth's orbit). [98] Sunlight on the surface of Earth is attenuated by Earth's atmosphere , so that less power arrives at the surface (closer to 1,000 W/m 2 ) in clear conditions when the Sun is near the zenith . [ 99 ]
1 day ago · The high speed trains ran at 125 miles per hour (201 km/h) speeding up journeys between towns and cities and is still known as the InterCity 125. Amtrak was formed in the United States in 1971, assuming responsibility for inter-city passenger operations throughout the country.
