But the conventional activated sludge process technology has some shortcomings: long water residence time, low processing power per unit area, large area reactor, sludge bulking and so on.

但是传统的活性污泥法工艺存在工艺流程长、污水停留时间长、单位面积处理能力低、反应池占地面积大、污泥膨胀等缺点。

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However, a spokesperson for Enron told the BBC that the average price of power per unit sold to the state government in the last year came to five Rupees and the cost will come down further once the Dabhol Power Co becomes a fully gas-based plant.

BBC: India casts doubt on Enron project

But the sober message about wind and solar applies to all renewables: All renewables, much as I love them, deliver only a small power per unit area, so if we want renewable facilities to supply power on a scale at all comparable to our consumption, those facilities must be big.

CNN: Commentary: Let's get real about alternative energy

And the logic works with servers as well as storage, as each device category continues to decrease in size, improve in capacity and performance, and reduce its power consumption per unit of work with each new generation.

FORBES: The Case for the Infinite Data Center