
The prolonged drought in California, now entering its fourth year, has altered the state's mix of energy generation sources, according to the U.S. Energy Information Administration (EIA). That's mixed news for those pushing for more reliance on renewables and less on fossil fuels.
The EIA issued a report yesterday that showed that, with the state's reservoirs currently at 42 percent of their normal levels for this time of year, the ability of hydroelectric dams to produce power has been cut in half. The dams, which normally produce about 20 percent of the state's power, are now producing only 10 percent.
With hydro power production at a ten-year low, reliance on natural gas hit a ten-year high. That's not good news, since fracking for natural gas requires copious amounts of water and has stirred up opposition in the state. (While most fracking in California is for oil, it also sits on large natural gas reserves).
According to the EIA, "In California, natural gas-fired capacity is often used to help offset lower levels of generation from hydropower facilities. The chart below shows how this inverse relationship can work: when monthly hydropower generation dips under 10-year average levels, monthly natural gas generation often rises above its 10-year average in response. From January through June of 2014, natural gas generation in California was percent higher compared to the same period in 2013 and 16 percent higher compared to the January-June average from the previous 10 years."
But on the positive side, the EIA says, "Wind and solar generation are also playing an increasingly significant role in California's generation mix.
Wind-generated energy exceeded hydropower for the first time in February and March, producing 30 percent of the state's power.
While hydropower is often thought of as clean and renewable, the hydroelectric dams have been controversial among environmentalists and tribal groups for the way they impact the land and the distribution of water resources. For instance, the Shasta Dam, one of the country's largest, has stirred anger for the way it has changed the region's ecological footprint and buried tribal lands in order to provide hydroelectricity and water for agriculture in the Central Valley.
"As drought and climate change intensify, we need to focus on the best and highest use of our rivers," said Gary Wockner of the Save the Colorado River and Poudre Waterkeeper. "Wind and solar are the best ways to generate electricity, whereas hydro-electric dams destroy rivers and cause methane emissions that accelerate climate change. Our rivers and water should flow as fast and freely as possible and be used to sustainably quench the thirst of people, fish and wildlife so that all three can continue to thrive."
Currently almost 6o percent of California in under severe or extreme drought, according to the latest U.S. Drought Monitor. Governor Jerry Brown declared a drought emergency in January.
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