It can save energy consumption by four fifths.

它可以节省五分之四的能源消耗。

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It can save energy for 20-30% as it is a good insulator.

因为它是一个良好的绝缘，它可以节省20 - 30%的能源。

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The third reason for using a bike is that it can save energy for our country.

原因之三是，使用自行车可以为我们国家节省能源。

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Nest claims it can save 20% on energy bills by managing heating more efficiently, and that adjusting temperature by just one degree can knock 5% off your bill.

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It's well known that you can slow a device's clock to save energy.

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It makes things that can be more easily disassembled, reused and recycled, and this can save a huge amount in energy and materials.

FORBES: Magazine Article