{"id":18819,"date":"2024-03-08T10:20:40","date_gmt":"2024-03-08T18:20:40","guid":{"rendered":"https:\/\/dornsife.usc.edu\/news\/?p=18819"},"modified":"2024-06-12T09:56:26","modified_gmt":"2024-06-12T16:56:26","slug":"eclipse-solar-power-interruptions","status":"publish","type":"post","link":"https:\/\/dornsife.usc.edu\/news\/stories\/eclipse-solar-power-interruptions\/","title":{"rendered":"April&#8217;s eclipse will mean interruptions in solar power generation, which could strain electrical grids"},"content":{"rendered":"\n\n\n    \n                                \n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--article-hero \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--article-hero\"\n    \n      >\n\n    \n<div class=\"inner-wrapper\">\n          \n<div class=\"f--field f--image\">\n\n    \n    \n    \n    \n    \n    \n              \n      <img\n                            data-src=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2024\/03\/SolarPanels_Eclipse_Top-768x432.png\"\n          data-srcset=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2024\/03\/SolarPanels_Eclipse_Top-1920x1080.png 1920w,https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2024\/03\/SolarPanels_Eclipse_Top-1280x720.png 1280w,https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2024\/03\/SolarPanels_Eclipse_Top-768x432.png 768w\"          data-sizes=\"(min-width:1200px) 75vw, (min-width:768px) 83vw, 100vw\"          class=\"lazyload\"\n        \n                  role=\"none\"\n        \n        \n                                      \/>\n\n    \n    \n  \n  \n\n<\/div>\n  \n      <div class=\"image-caption\">\n          \n<div class=\"f--field f--description\">\n\n    \n  Solar panels convert sunlight into electricity. (Photo: iStock.) \n\n\n<\/div>\n    <\/div>\n  \n  <div class=\"text-wrapper\">\n          <nav aria-label=\"Breadcrumb\" class=\"breadcrumbs\">\n        <ul>\n                      <li><a href=\"\/news\/stories\/\">News<\/a><\/li>\n                      <li><a href=\"\/news\/stories\/\/?category=science-and-technology\">Science and Technology<\/a><\/li>\n                  <\/ul>\n      <\/nav>\n    \n              \n<div class=\"f--field f--page-title\">\n\n    \n  <h1>April&#8217;s eclipse will mean interruptions in solar power generation, which could strain electrical grids<\/h1>\n\n\n<\/div>\n    \n          <div class=\"subtitle\">\n            \n<div class=\"f--field f--description\">\n\n    \n  When the Moon blocks the Sun during an eclipse, utility suppliers have to pull power from the grid to make up for gaps in solar energy.\n\n\n<\/div>\n      <\/div>\n    \n           <strong class=\"author-field\"><span >By<\/span><a href=\"mailto:peroomia@usc.edu\">Vahe Peroomian<\/a><\/strong>\n    \n          <span class=\"post-date-field\">March 8, 2024<\/span>\n      <\/div>\n<\/div>\n\n\n  <\/div><\/div>\n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--social-share \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--social-share\"\n    \n      >\n\n    \n  <div class=\"content-wrapper\">\n    <span class=\"a2a_kit a2a_kit_size_32 addtoany_list\" style=\"line-height: 32px;\">\n      <span class=\"title\">\n        Share\n      <\/span>\n                        <a class=\"a2a_button_copy_link\" target=\"_blank\" href=\"\/#copy_link\" rel=\"nofollow noopener\" title=\"Link\">\n            <span class=\"a2a_svg a2a_s__default a2a_s_copy_link\">\n              <svg height=\"19\" viewBox=\"0 0 19 19\" width=\"19\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"m7.43475275 9.52380952-2.17490843 2.26076008c-1.08745421 1.058837-1.68841575 2.518315-1.68841575 4.0350275 0 1.5167124.60096154 2.9475732 1.68841575 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xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"m8.14285714 9.42857143c-.17142857 0-.34285714 0-.51428571.08571428l7.28571427 6.34285719c.3428572.2571428.6857143.2571428.9428572 0l7.2857142-6.34285719c-.0857142-.08571428-.2571428-.08571428-.4285714-.08571428zm-1.28571428 1.11428567v.1714286 8.5714286c0 .6857143.6 1.2857143 1.28571428 1.2857143h14.57142856c.6857143 0 1.2857143-.6 1.2857143-1.2857143v-8.5714286c0-.0857143 0-.0857143 0-.1714286l-7.2 6.3428572c-.7714286.6857143-1.8857143.6857143-2.6571429 0z\" fill-rule=\"evenodd\" transform=\"translate(-6 -9)\"\/><\/svg>\n            <\/span>\n            <span class=\"a2a_label visually-hidden\">Email<\/span>\n          <\/a>\n                  <\/span>\n  <\/div>\n\n  <\/div><\/div>\n \n\n\n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--rich-text \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--rich-text\"\n    \n      >\n\n    \n      \n<div class=\"f--field f--wysiwyg\">\n\n    \n  <p>During the most recent total solar eclipse visible in the U.S., on Aug. 21, 2017, the skies darkened as the Moon crossed in front of the Sun. It blocked out all sunlight \u2013 except for that from a golden ring visible around the Moon\u2019s shape, called the corona. Not surprisingly, solar power generation across North America plummeted for several hours, from the first moment the Moon began to obscure the Sun to when the Sun\u2019s disk was clear again. <\/p>\n<p><a href=\"https:\/\/sustainability.usc.edu\/assignment-earth\/\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-thumbnail wp-image-16067\" src=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2023\/07\/AE_News-Rubric-150x150.png\" alt=\"On a gold background, &quot;Asgmt Earth&quot; appears inside a black circle and &quot;USC&quot; inside a small, white circle that slightly overlaps the black circle.\" width=\"150\" height=\"150\" srcset=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2023\/07\/AE_News-Rubric-150x150.png 150w, https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2023\/07\/AE_News-Rubric-500x500.png 500w, https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2023\/07\/AE_News-Rubric-1024x1024.png 1024w, https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2023\/07\/AE_News-Rubric-768x768.png 768w, https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2023\/07\/AE_News-Rubric-320x320.png 320w, https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2023\/07\/AE_News-Rubric.png 1250w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/a><\/p>\n<p>On April 8, 2024, another <a target=\"_blank\" href=\"https:\/\/theconversation.com\/when-the-sun-goes-dark-5-questions-answered-about-the-solar-eclipse-81308\">total solar eclipse<\/a> will track across the U.S., causing perhaps an even greater loss of solar power generation. Although this will be the second total solar eclipse visible in the U.S. in under seven years, these events are a rare occurrence. Nevertheless, they present a unique challenge to power grid operators.<\/p>\n<p><a href=\"https:\/\/dornsife.usc.edu\/profile\/vahe-peroomian\/\">I am a space scientist<\/a> with a passion for teaching physics and astronomy. Though I have seen many partial eclipses of the Sun, I have yet to witness a total solar eclipse. My road trip to Bryce Canyon National Park in Utah in October 2023 to see the \u201cring of fire\u201d <a target=\"_blank\" href=\"https:\/\/theconversation.com\/explainer-what-is-a-solar-eclipse-33019\">annular solar eclipse<\/a> was unforgettable, and April 8 will surely find me handing out <a target=\"_blank\" href=\"https:\/\/theconversation.com\/turn-around-bright-eyes-heres-how-to-see-the-eclipse-and-protect-your-vision-203571\">eclipse glasses<\/a> once again.<\/p>\n<h2>When the Moon\u2019s shadow blocks the Sun<\/h2>\n<p>During <a target=\"_blank\" href=\"https:\/\/theconversation.com\/explainer-what-is-a-solar-eclipse-33019\">a solar eclipse<\/a>, the Moon partially or completely blocks the view of the Sun. Since the Moon is nearly 400 times smaller than the Sun and nearly <a target=\"_blank\" href=\"https:\/\/www.universetoday.com\/17109\/the-sun-and-the-moon\/\">400 times closer<\/a>, the <a target=\"_blank\" href=\"https:\/\/www.forbes.com\/sites\/startswithabang\/2017\/02\/08\/the-strangest-eclipse-fact-of-all-the-moons-shadow-isnt-a-circle\/?sh=be76f8c17bd3\">Moon\u2019s shadow<\/a>, visible from Earth, tapers to a width of <a target=\"_blank\" href=\"https:\/\/cmase.uark.edu\/_resources\/pdf\/nasa\/NASAConnect\/pathoftotality.pdf\">70 to 100 miles<\/a> (112 to 161 kilometers).<\/p>\n<p>Within this region, called the path of totality, observers see a total solar eclipse. Observers close to but outside this path witness a partial eclipse of the Sun, where the Moon covers a fraction of the Sun\u2019s disk. <\/p>\n<p>During the April 8, 2024, total solar eclipse, the <a target=\"_blank\" href=\"https:\/\/science.nasa.gov\/eclipses\/future-eclipses\/eclipse-2024\/where-when\/\">path of totality<\/a> in the continental U.S. will extend from Texas in the south to Maine in the northeast. Elsewhere in the U.S., Miami will see a partial eclipse in which a maximum of 46% of the Sun\u2019s disk obscured. In Seattle, far from the path of totality, the Moon will cover only a maximum of <a target=\"_blank\" href=\"https:\/\/www.timeanddate.com\/eclipse\/map\/2024-april-8\">20% of the Sun<\/a>. In southern Texas, where the path of totality first crosses into the U.S., the eclipse will last just under three hours, with totality a mere 4 minutes and 27 seconds. <\/p>\n<figure>\n<div class=\"video-embed\"><iframe loading=\"lazy\" width=\"440\" height=\"260\" src=\"https:\/\/www.youtube.com\/embed\/sOpYoO_SK7o?wmode=transparent&amp;start=0\" frameborder=\"0\" allowfullscreen=\"\"><\/iframe><\/div><figcaption><span class=\"caption\">The path of the 2024 solar eclipse.<\/span><\/figcaption><\/figure>\n<h2>Increasing reliance on solar power<\/h2>\n<p>The worldwide trend toward renewable energy has seen a significant increase in solar, or photovoltaic, power generation in the last decade. Solar power generation capacity is set to <a target=\"_blank\" href=\"https:\/\/www.iea.org\/data-and-statistics\/data-tools\/renewable-energy-progress-tracker\">double worldwide<\/a> between 2022 and 2028, and the U.S. now has the capacity to generate <a target=\"_blank\" href=\"https:\/\/ember-climate.org\/data-catalogue\/yearly-electricity-data\/\">three times more solar energy<\/a> than at the time of the 2017 total solar eclipse.<\/p>\n<p>The most obvious obstacle to solar power generation is cloud cover. On a cloudy day, the energy produced by solar panels drops to <a target=\"_blank\" href=\"https:\/\/www.forbes.com\/home-improvement\/solar\/solar-panels-cloudy-days-night\/\">10% to 25%<\/a> of its output on a sunny day. <\/p>\n<p>The North American power transmission grid is divided into <a target=\"_blank\" href=\"https:\/\/www.nerc.com\/AboutNERC\/keyplayers\/Pages\/default.aspx\">six major regions<\/a> and <a target=\"_blank\" href=\"https:\/\/alternativeenergy.procon.org\/questions\/what-is-the-electricity-grid\/\">more than 150<\/a> local and regional subgrids. Electrical system operators in each local grid continuously balance the amount of electricity production with the \u201cload,\u201d or the demand for electricity by consumers. <\/p>\n<p>System operators can tap into energy from <a target=\"_blank\" href=\"https:\/\/science.howstuffworks.com\/environmental\/energy\/power.htm\">various power generation mechanisms<\/a> like solar, wind, hydroelectric, natural gas and coal. Local grids can also import and export electricity to and from their grid as needed.<\/p>\n<p>System operators have accurate models for the amount of solar power generated across the U.S. on a daily basis, and these models account for the parts of the continental U.S. that may have cloudy skies. By pairing solar power generation with battery storage, they can access electricity from solar even when the Sun isn\u2019t shining \u2013 on cloudy days or at night. <\/p>\n<p>To plan for an eclipse, electrical system operators need to figure out how much the energy production will drop and how much power people will draw from the reserves. On the day of the 2017 total solar eclipse, for example, solar power generation in the U.S. <a target=\"_blank\" href=\"https:\/\/www.nrel.gov\/docs\/fy18osti\/71147.pdf\">dropped 25%<\/a> below average. <\/p>\n<p>Because solar power production falls quickly during the eclipse\u2019s peak, grid operators may need to tap into reserves at a rate that may strain the <a target=\"_blank\" href=\"https:\/\/www.osha.gov\/etools\/electric-power\/illustrated-glossary\/transmission-lines\">electrical transmission lines<\/a>. To try to keep things running smoothly, grid operators will rely on local reserves and minimize power transfer <a target=\"_blank\" href=\"https:\/\/www.nrel.gov\/docs\/fy18osti\/71147.pdf\">between grids<\/a> during the event. This should lessen the burden on transmission lines in local grids and prevent temporary blackouts. <\/p>\n<h2>Renewable energy during eclipses<\/h2>\n<p>Solar isn\u2019t the only type of renewable energy generation that goes down during an eclipse. Since it\u2019s not as sunny, temperatures along the path of the eclipse fall by as much as <a target=\"_blank\" href=\"https:\/\/eclipse2017.nasa.gov\/temperature-change-during-totality\">10 degrees Fahrenheit<\/a> (5.5 degrees Celsius). Lower temperatures lead to <a target=\"_blank\" href=\"https:\/\/doi.org\/10.1093\/astrogeo\/atx135\">slower wind speeds<\/a> and less wind power generation. <\/p>\n<p>During the August 2017 eclipse, the loss of renewable power generation added up to nearly <a target=\"_blank\" href=\"https:\/\/www.nrel.gov\/docs\/fy18osti\/71147.pdf\">6 gigawatts<\/a>. That\u2019s equivalent to the energy usage of <a target=\"_blank\" href=\"https:\/\/www.energy.gov\/eere\/articles\/how-much-power-1-gigawatt\">600 million LED lightbulbs<\/a> or <a target=\"_blank\" href=\"https:\/\/www.cnet.com\/home\/energy-and-utilities\/gigawatt-the-solar-energy-term-you-should-know-about\/\">4.5 million homes<\/a>. <\/p>\n<p>Grid operators compensated by planning ahead and increasing power generation at <a target=\"_blank\" href=\"https:\/\/www.nrel.gov\/docs\/fy18osti\/71147.pdf\">natural gas and coal-powered plants<\/a>, which don\u2019t depend on sunlight. <\/p>\n<p>Over the duration of the eclipse, this increase in nonrenewable energy use led to approximately <a target=\"_blank\" href=\"https:\/\/www.eia.gov\/tools\/faqs\/faq.php?id=74&amp;t=11\">10 million pounds<\/a> of extra carbon dioxide emissions. That\u2019s about the annual carbon dioxide emissions of 1,000 cars.<\/p>\n<p>On April 8, <a target=\"_blank\" href=\"https:\/\/theconversation.com\/astro-tourism-chasing-eclipses-meteor-showers-and-elusive-dark-skies-from-earth-207969\">eyes across the U.S. will turn upward<\/a> to catch a glimpse of the eclipsed Sun.<\/p>\n<p>Thanks to the vigilance of electric grid operators, the lights should stay on, and observers won\u2019t have to worry about anything but the stunning show in the sky.<!-- Below is The Conversation's page counter tag. Please DO NOT REMOVE. --><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/counter.theconversation.com\/content\/220824\/count.gif?distributor=republish-lightbox-basic\" alt=\"The Conversation\" width=\"1\" height=\"1\" style=\"border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important\" referrerpolicy=\"no-referrer-when-downgrade\" \/><!-- End of code. If you don't see any code above, please get new code from the Advanced tab after you click the republish button. The page counter does not collect any personal data. More info: https:\/\/theconversation.com\/republishing-guidelines --><\/p>\n<p><span><a target=\"_blank\" href=\"https:\/\/theconversation.com\/profiles\/vahe-peroomian-749331\">Vahe Peroomian<\/a>, Professor of Physics and Astronomy, <em><a target=\"_blank\" href=\"https:\/\/theconversation.com\/institutions\/usc-dornsife-college-of-letters-arts-and-sciences-2669\">USC Dornsife College of Letters, Arts and Sciences<\/a><\/em><\/span><\/p>\n<p>This article is republished from <a target=\"_blank\" href=\"https:\/\/theconversation.com\">The Conversation<\/a> under a Creative Commons license. Read the <a target=\"_blank\" href=\"https:\/\/theconversation.com\/aprils-eclipse-will-mean-interruptions-in-solar-power-generation-which-could-strain-electrical-grids-220824\">original article<\/a>.<\/p>\n\n\n\n<\/div>\n\n\n  <\/div><\/div>\n\n\n\n  \n        \n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--article-related-stories \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--article-related-stories\"\n    \n      >\n\n    \n  <div class=\"inner-wrapper\">\n              \n<div class=\"f--field f--section-title\">\n\n    \n  <h2>\n          Related Articles\n      <\/h2>\n\n\n<\/div>\n    \n                  <article>\n              \n<div class=\"f--field f--cta-title\">\n\n    \n  <h3>\n          <a href=\"https:\/\/dornsife.usc.edu\/news\/stories\/usc-dornsife-student-researches-solar-energy\/\" \n                        class=\"\" \n      >Solar energy research takes center stage<\/a>\n      <\/h3>\n\n\n<\/div>\n        <\/article>\n              <article>\n              \n<div class=\"f--field f--cta-title\">\n\n    \n  <h3>\n          <a href=\"https:\/\/dornsife.usc.edu\/news\/stories\/power-to-the-people\/\" \n                        class=\"\" \n      >Power to the People<\/a>\n      <\/h3>\n\n\n<\/div>\n        <\/article>\n              <article>\n              \n<div class=\"f--field f--cta-title\">\n\n    \n  <h3>\n          <a href=\"https:\/\/dornsife.usc.edu\/news\/stories\/solar-energy-system-up-and-running-at-uscs-catalina-island-facility\/\" \n                        class=\"\" \n      >Solar energy system up and running at USC\u2019s Catalina Island facility<\/a>\n      <\/h3>\n\n\n<\/div>\n        <\/article>\n            <\/div>\n\n\n  <\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>When the Moon blocks the Sun during an eclipse, utility suppliers have to pull power from the grid to make up for gaps in solar energy.<\/p>\n","protected":false},"author":13,"featured_media":18822,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[16],"tags":[87,83],"class_list":["post-18819","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science-and-technology","tag-expert-viewpoint","tag-the-conversation"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>April&#039;s eclipse will mean interruptions in solar power generation, which could strain electrical grids<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dornsife.usc.edu\/news\/stories\/eclipse-solar-power-interruptions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"April&#039;s eclipse will mean interruptions in solar power generation, which could strain electrical grids\" \/>\n<meta property=\"og:description\" content=\"When the Moon blocks the Sun during an eclipse, utility suppliers have to pull power from the grid to make up for gaps in solar energy.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/dornsife.usc.edu\/news\/stories\/eclipse-solar-power-interruptions\/\" \/>\n<meta property=\"og:site_name\" content=\"USC Dornsife News\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/uscdornsife\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-08T18:20:40+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-06-12T16:56:26+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2024\/03\/SolarPanels_Eclipse_Top-1024x589.png\" 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