At night, when demand is lower, these power stations can be switched off, which means that each unit of electricity has a lower carbon footprint.

到了晚上，需求降低，这些发电站就会关闭。这意味着产生每单位电能所带来的碳足迹降低了。

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An air-conditioning unit outside the house or building runs USES electricity to cool the air and then sends into the building through openings in the rooms of the buildings.

室外的一个空调装置则使用电力将空气的温度下降，下降的空气通过房间的通道送往整栋大楼。

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Jug kettles are fast and convenient, but their fuel - electricity from the national grid - produces almost three times more greenhouse gas for each unit of heat than burning gas in the home does.

电热水壶烧水快而且方便，不过它们的燃料——来自全国电网的电——产生每单位热量所排放的温室气体是自己在家烧煤气的3倍。

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The council said the project was only possible due to a government subsidy which made a payment for every unit of electricity generated by solar panels.

BBC: Leeds City Council solar panel plans "reluctantly" on hold

He said well-designed systems can operate effectively in the UK, delivering in excess of three units of heat for every unit of electricity used to pump the heat in and around the property.

BBC: Heat pumps 'need tighter regulations'

The solar mission in its first phase focused on areas already connected to the grid and had a pricing system that bundled four units of thermal electricity with one unit of solar-based power, which reduced the average per-unit cost of solar electricity.

WSJ: India Plans Subsidies to Boost Solar-Power Sector