Building turbines on land can be just as controversial, suitable locations for fixed-base shallow-water turbines are limited and a new generation of big turbines will need lots of space: only a couple can be placed in each square kilometre.
With not enough water to go through the turbines, power stations are not firing on all four cylinders.
Run-of-the-river dams like Baglihar consume nothing, since water must flow to run turbines.
Hydro dams can be reversed and pump water uphill so that the next day, when gravity pulls the water back down, the turbines spin to make electricity.
Moreover, even if it does rain in the region, it would take two to three days for that water intake to be recorded at the dam, since it takes that much time for the water to travel to the turbines.
Not making electricity is not an option on the river, the BPA argues, because only a limited amount of water can be kept out of turbines and spilled over federal dams.
The biomass power station would burn rubbish, animal manure, woodchips, seaweed, corn stalks and other wastes, to heat water to create steam to turn turbines to produce around 300 megawatts of electricity.
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The viable business ideas ranged from highly advanced water meters to de-icing wind turbines.
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In a full-scale tokamak this heat would be tapped to boil water, which would then drive steam turbines to generate electricity.
It would hold on to water and then let it out through turbines at both high and low tides which would generate electricity.
When energy demand is high, the water is allowed to run back downhill through turbines.
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Currently, wind turbines are situated in relatively shallow water -- around 40 meters.
In global renewable energy news, we learned that engineers in Hong Kong are working on using water mains to create electricity by attaching small turbines to them that can each pump out about 80 volts.
The power is used to pump water up into the reservoirs that feed the hydroelectric turbines.
Eligible improvements (PDF) include not only energy-saving equipment such as insulation, lighting, and HVAC systems but onsite renewable energy (rooftop PV, wind turbines, and fuel cells) and water-saving upgrades such as low-flow plumbing fixtures and grey water systems.
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Hundreds of acres of virgin forest will be inundated with water in order to build the reservoir to power the turbines that will generate electricity.
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Its two turbines provided the country's first toe in the water for offshore wind power in December 2000.
As the water flows downhill, it picks up the speed necessary to spin the turbines in the powerhouse and create electricity.
Similarly, solar thermal energy--which harnesses the heat of the sun to generate steam-powered turbines--consumes more than 2, 600 liters of water per megawatt hour, 200 liters more than coal-powered generation needs to produce the same energy.
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