However, this form of energy requires expensive plants to turn the gas into liquid at source.

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The bill would allow for the early payment of the winter fuel allowance to people whose homes are not connected to the mains gas grid and whose principal source of fuel is home fuel oil, liquid petroleum gas or propane gas.

BBC: Winter Fuel Allowance Payments Bill

Although the exact mechanism is still not entirely understood, it turns out that illuminating the liquid crystal, applying a voltage across a small region of it, and then turning off the light source causes a small amount of charge to be stored in that region.

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