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Nuclear power is definitely on its way out, Barry. With the Japan scare, people and governments are going to keep well away from building new nuclear power stations.
Tom, electricity is usually obtained through movement. Vapour can only create electricity (in the viable form) through turning turbines. The same goes for wind and water.
Then there is the more recent and more expensive way of using light to create electricity without movement of turbines. But this needs more research to become financially practical on a large scale.
Then there is the atomic energy process, which is very expensive, and dangerous.
The idea of using great temperatures from molten rock, as you suggested, to heat water and create vapour to turn turbines, would encounter a problem: the infrastructure would be too expensive, if placed deep underground, and would risk melting, or collapsing.
Any outburst of lava could send it back up out of the ground in a million unrecognisable fragments.
The ecological options of wind, solar and water energy are each possible and in use. Water where there are water-falls, such as dams in hilly areas; solar in hot areas, and wind in windy regions.
Solar energy at present requires very expensive infrastructure, whether the energy comes through vapour turning a turbine or through the transformation of light into electricity (this in particular is very expensive and economically out of rangel at this stage).
That leaves us with wind and water energy as the two clean and commercially viable options, with an eye on solalr energy research too. Obviously, we can't go on burning coal, gas and petrol to produce electricity, as these resources pollute, are limited and are becoming increasingly more expensive.
We should be focusing on clean energy from wind, water and sun, and to improve the infrastructure-models we need more research. A type of wind-turbine that costs a lot less and can turn in high winds would be ideal, even though it may need integrating with other power supplies for the periods when there is little wind.
Research is required in order to obtain new and better energy-producing proto-types.
It's just a technical aspect, the answer is round the corner, and some-one will get there first, and present a patented model. It's just a matter of time.