While the urban sprawl around Honolulu consumes the bulk of the energy, most potential renewable sources are far from the city, 150 miles southeast or 100 miles to the northwest.

檀香山城市的周边消耗大量的能源，而最有潜力的可再生能源却来自于城市东南150英里或西北100英里远的偏远地区。

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Copenhagen aims to be the world's first carbon-neutral capital city by 2025; malmo to be powered entirely by renewable energy by 2030.

哥本哈根立志到2025年成为世界第一座碳中立首都城市；马尔默计划到2030年完全依靠可再生能源发电。

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The City of Bilbao's metro service has announced that the transportation system was powered completely by renewable sources last year, making it the first metro system in the world to do so.

毕尔巴鄂市地铁公司宣布，自去年起全市地铁系统已完全以可再生能源为动力，这是世界上第一个这样的交通系统。

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For its part, the city says that renewable energy would immediately comprise half of its offerings for the same cost that its citizens now pay Xcel.

FORBES: Boulder Battles for Control of Xcel Energy's Assets

Peterborough City Council is proposing to build renewable energy parks on three sites near the city.

BBC: Peterborough farmers fight council's solar panel farm

While Colorado has a 30 percent renewable portfolio standard, the city wants to increase that to as much as 90 percent by 2020.

FORBES: Boulder Battles for Control of Xcel Energy's Assets