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Price per watt
:''See also: Cost of electricity by source for a comparison of prices per watt by generation source''
Price per watt, or $/W is a common way to compare the capital costs of various forms of electricity generation. It refers to the number of dollars one would have to spend to buy a machine capable of producing one watt of electricity. It is calculated by dividing the total project capital cost by the amount of peak power or watts-peak (Wp) it can produce.
== Installation costs ==
Coal power plants are generally one of the least expensive sources of electricity by this measure, at a construction cost around $2.10 a watt.〔John Markoff, ("Start-Up Sells Solar Panels at Lower-Than-Usual Cost" ), ''New York Times'', 18 December 2007〕 Large hydroelectric systems can be even less expensive by this measure; the Three Gorges Dam is reported to have cost ¥180 billion (US$26 billion), about $1 a watt, but actual costs are widely believed to be much higher.〔("Three Gorges dam wall completed" ), BBC News, 20 May 2006〕 Solar panels are currently selling for as low as US$0.70 per watt (7-April-2012) in industrial quantities; the balance of system costs (inverters, racks, wiring, marketing) made the median price in 2011 of large (>100 kW) systems $2.60/watt in Germany and $4.87/watt in the US.〔("Photovoltaic pricing trends" )〕 The price difference between German and US photovoltaic systems was analyzed in 2013 by Lawrence Berkeley National Laboratory.〔"Why are residential PV prices so much lower in Germany than in the US?" ()〕 Large wind turbines cost about $2 a watt.〔("How much do wind turbines cost? )〕 Natural gas-fired peaking power plants are around $1 per watt ($1,000/kW) of electrical capacity.〔("Updated Capital Cost Estimates for Utility Scale Electricity Generating Plants )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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