同受制于欧盟可再生能源指令相比，英国可以自主地为绿色能源发电制定一项较不明确的目标，这意味着电力价格会更加便宜。

Britain would be free to set itself a less exacting target for green-power generation than it is bound to under the EU's renewable-energy directive. That could mean cheaper power.

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这个市场预计将继续增长，因为欧盟成员国努力实现他们的供热和冷却目标，根据欧盟委员会的可再生能源指令。

This market segment is expected to continue growing as EU member states work toward achieving their heating and cooling targets under the European Commission's Renewable Energy Directive.

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其中同样也有外部作用，尤其是欧盟促进可再生能源使用指令，其要求到2020年，英国必须有15%的电力来源于可再生能源。

But external factors have helped, too. In particular, a European Union directive requires Britain to derive 15% of its energy demand from renewables by 2020.

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