When Grand Coulee Dam was completed in 1942, it was called the “Eighth Wonder of the Modern World.” With its 151-mile-long reservoir and ability to produce 6,809 megawatts of electricity, no one could imagine a bigger or more powerful dam — and no one realized the scope of economic development that low-cost, reliable hydropower would create.
Actually someone did. China.
This year, China completed its gargantuan Three Gorges hydroelectric project with triple the power generation of Grand Coulee. The controversial project is the largest dam in the world. The Chinese government defends it and other proposed hydro projects as critical to curbing disastrous flooding on the Yangtze River and generating electricity needed to power China’s economic growth.
New mega-dams are also planned on the Amazon and Mekong rivers.
Renaissance of sorts
What’s behind this renaissance of hydropower?
First, hydropower produces no greenhouse gases and generates large amounts of electricity in one spot.
The electricity produced by the Three Gorges Dam is equivalent to the output of 15 nuclear reactors. The comparison to wind and solar power is even more striking. It takes thousands of acres of wind turbines and solar panels to produce an equivalent stable supply of electricity, that generation occurs only when the wind blows or the sun shines.