A total solar eclipse will block sunlight from reaching parts of the Earth for an estimated three hours on August 21. As a result, at least 7 million U.S. homes and businesses that rely on solar power will be directly affected. But there’s no reason to be nervous: electric grid and skilled operators are well-prepared.

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A total solar eclipse is a rare phenomenon which occurs when the moon passes directly between the Earth and the sun. Though it will disrupt solar generation during times of peak generation, the event is not one to fear. According to Julia Prochnik, the Director of Western Renewable Grid Planning, people will not notice any change in their electrical service as electric grid operators across the country have made appropriate preparations.

The last time citizens in the U.S. glimpsed a solar eclipse was in 1979, when solar energy was in its infancy. In the time that has passed, the energy system has changed significantly. Wind and solar energy are now the fastest-growing sources of renewable electricity in the U.S.

Prochnik says that some states will see a larger drop in solar power than others; it all depends on how much the sun is blocked by the moon in their specific location. Fortunately, there are plenty of energy resources available to “fill the gap,” and they include geothermal, wind and hydropower.

Related: Coming Total Solar Eclipse to be an ‘event of the century’, scientists say

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NASA reports that the solar eclipse will block a 70-mile-wide path stretching from Oregon to South Carolina. The longest period of total darkening will be about two minutes and 40 seconds. Nationwide, the moon will still block at least a portion of the sun. At any one spot, the longest period of partial darkness may last three hours.

Arizona can expect to experience a brief interruption in 70 percent of its rooftop solar generation. New York follows with 68 percent, Utah can expect a 39 percent, and Nevada a 24 percent interruption. California and North Carolina may experience the biggest impacts from the eclipse, as they are both major solar producers. The difference can be compensated by reducing energy use and/or by temporarily drawing electricity from the grid.

A few things environmentally-conscious individuals can do to prepare for the eclipse is replace all light bulbs with LEDs, turn off lights, unplug chargers and appliances, and turn down their thermostats. All of these steps will help save energy and reduce load grid pressure. All in all, the celestial event is one to celebrate, as it is one few will likely witness again.


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