全美50个州中至少有21个有这样的“可再生能源发电配额制”，它要求各地公用事业部门要在规定期限达到标准。
No fewer than 21 of America's 50 states have such "renewable portfolio standards", which local utilities are obliged to meet within a set period.
全美50个州中至少有21个有这样的“可再生能源发电配额制”，它要求各地公用事业部门要在规定期限达到标准。
No fewer than 21 of America's 50 states have such "renewable portfolio standards", which local utilities are obliged to meet within a set period.
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