The system USES solar energy as power supply, so it isn't restricted by the condition of commercial power supply.

控制系统以太阳能作为能源，因此使用不受市电供电条件的限制。

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The 12v dry cell is used to replace an external power transformer for power supply, which can not be affected by commercial power supply.

用12 V干电池取代外置电源变压器供电从而不受市电供电的影响。

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For the construction of new commercial buildings and satellite towns, the city will be looking at energy systems that address problems of power supply, use and efficiency.

未来的商务楼、卫星城的建设中，要把分布式能源系统纳入规划设计中，使大城市供能系统逐步走上集中与分散相结合的合理布局。

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But companies like these have an excess of commercial power in their particular supply chain that shifts business risks, like the non-availability of goods on a production line, to a supplier without shifting the associated profit.

ECONOMIST: Pakistan's problems