In this case, however, the front electric motor-which is now supplied with energy by the TDI engine-operates exclusively as a generator and a power source for the electric motor at the rear.

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Driving those market valuations is the expectation of more growth ahead: Analysts both in industry and in the government anticipate that solar will be the fastest-growing alternative source of electric power over the next 25 years.

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Crews have been working for a long time on the electric lines above the tracks, the power source for the trains.

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Nuclear: Nuclear is the energy source for the majority of electric power generation for the long term.

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Bob Gibson, VP for market intelligence at the Solar Electric Power Association (SEPA), pointed to one large source of growth for the industry: utilities expanding their energy mix to include solar.

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On the other hand, this conflation makes far more sense in the long term, as our electrical grid becomes more sophisticated, and as electric vehicles begin the inevitable switch from internal combustion engines to electric motors or some other renewable source of power.

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It will also be able to power cars indirectly, as an electricity source for electric vehicles starting to arrive in showrooms.

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Dr Wilkinson, whose work is funded by the Tampa Electric Company, said that vegetation was likely to prove a useful source of power for many robots.

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The laptops will have a low-tech independent source of energy, so they can be used in towns with little or no electric power.

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