To establish a house saving energy system, this text first analyses several net structures, and chooses power line as the correspondence medium, and also USES DTMF coding mode.

为了建立节能控制系统，本文首先分析了几种常见的住宅内的网络结构，从中选用了以电力线为通信介质的通讯网络，并介绍了一种基于DTMF编码方式的电力线通信系统。

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Gore subsequently has installed solar panels, a geothermal heating and cooling system, compact fluorescent light bulbs and other energy-saving technologies in his home.

随后，戈尔在家中安上了太阳能电板、地热供热和制冷系统、节能荧光灯和其他节能技术。

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We improved policies on saving energy and reducing emission of pollutants, and established a general responsibility system for meeting energy saving and pollution discharge reduction targets.

完善节能降耗、污染减排政策，普遍建立节能减排目标责任制。

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With the right combination of capacity, performance and rapid power cycling storage system designs can pump more iron while keeping cool and saving energy.

FORBES: Pumping Iron and Keeping Cool

Of course the total energy used by a hard disk drive depends upon the actual usage and power saving modes, and caching of data can reduce the energy used by a HDD in a computer system.

FORBES: Seagate Discontinuing 7,200 RPM Drives--A Focus on Capacity?