The Inchinnan-based firm plans to sell enough electricity to the national grid to supply all of its stores.

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But huge investments in hydropower in Bhutan (in return for the guaranteed supply of fixed-price electricity into India's grid) helped both countries.

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In fact, a battery system can perform more than a dozen tasks, from sending short bursts of power to stabilize the electric grid to releasing a steady supply of electricity over a longer period of time when there is a lot of demand for power.

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For instance, homes equipped with solar-power panels could feed unused electricity back into the grid, adding to the total available supply.

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For ten years he's been trying to convince utilities and automakers that electric cars could draw power at night, when power is cheaper, and then discharge some of that juice back into the grid during the day to balance supply and demand for electricity.

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Both stations supply power to the National Grid at peak times when there is extra demand for electricity.

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When a car is sitting in the garage, its fuel cells could supply the power needed to run a house--maybe even sell electricity back to the grid.

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Because utilities and state regulators are putting a premium on solar energy when they evaluate and approve power purchase agreements even though solar electricity production typically fluctuates and makes it more difficult to balance the supply and demand in an electric grid.

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Wind power is also being experimented with in a small way for power generation in northern and western China, where it could supply electricity to rural villages in windswept and increasingly arid Inner Mongolia and Gansu Province that are still not on the grid.

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