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４月２５日美国议会通过了美国国内能源法案第S５１７号部分联邦新能源标准（RPS）以及为期５年的风能发电减免税法案。这项法案同时也会对小型风电系统（用于家庭、农场及小商业）的投资实行减税制度。RPS规定至２００５年可再生能源发电将以每年１％的速度递增，截止到２０２
On April 25, the U.S. Congress passed the US National Energy Act No. S517 Federal Renewable Energy Standard (RPS) and a five-year wind power generation tax relief act. The act also imposes a tax deduction on investments in small-scale wind power systems (for homes, farms and small businesses). RPS stipulates that by 2005 renewable energy power generation will be an annual rate of 1% increase, as of 202