Tellingly, about two-thirds of bids for solar energy contracts last year (by electricity generated) were for photovoltaic projects and only a third were for solar thermal power plants, which deploy vast arrays of mirrors to heat liquids and produce steam to drive an electricity-generating turbine.
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That changed a lot when the heat of fire was used for boiling water into steam to drive industry, which became large scale and controlled by a few people with countless labourers and employees, whose smaller scale business had come to be totally outcompeted and had no choice but to accept the working conditions that suited these new tycoons.
In a full-scale tokamak this heat would be tapped to boil water, which would then drive steam turbines to generate electricity.
There are many nontrivial ancillary challenges too, especially the secondary procedure of actually getting the energy out of the reactor into a useful form, i.e. heat to drive steam-turbines as with all other kinds of thermal power stations, to generate electricity.
It is then run back through the heat exchanger to drive the steam turbine when needed.
To keep turbine sales spinning, Immelt has turned to a process that partially burns pulverized coal in the presence of pure oxygen to turn it into a flammable gas that can drive linked gas and steam turbines.
This gas is used to drive the turbine just as steam would be.
The steam turns turbines, which in turn drive electric generators.
The efficiency of his design is further improved by using the moving piston to drive water through a special steam nozzle, which increases the effectiveness of the heat transfer between the inside and outside of the reactor.
The drive to recall him picked up steam last November, after unions defeated a similarly restrictive collective-bargaining law in a referendum in Ohio.
Many construction firms, in particular, are hoping for a big expansion of public sector work as the government drive to boost public services gathers steam.
The drive to recall Mr Walker picked up steam last November after unions defeated similar measures at a referendum in Ohio, and since then over 900, 000 Wisconsinites have signed the petition demanding Mr Walker face a fresh election, almost twice the number needed.
As you drive through the country, you are likely to notice steam leaking from crevices or spewing ahead on the horizon -- evidence of geothermal vents and hot springs.
This meant either having to download games from a digital distribution service such as Steam or Origin, or having to lug about a portable optical drive.
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Analysts said that as the mining boom starts to run out of steam, the other sectors of the economy will have to take over and drive growth.
An international drive against tax evasion and the use of tax havens has been picking up steam.
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