{"id":19744,"date":"2019-11-15T15:45:17","date_gmt":"2019-11-15T20:45:17","guid":{"rendered":"http:\/\/blogs.edf.org\/energyexchange\/?p=19744"},"modified":"2019-11-15T17:14:13","modified_gmt":"2019-11-15T22:14:13","slug":"long-considered-a-clean-energy-source-hydropower-can-actually-be-bad-for-climate","status":"publish","type":"post","link":"https:\/\/blogs.edf.org\/energyexchange\/2019\/11\/15\/long-considered-a-clean-energy-source-hydropower-can-actually-be-bad-for-climate\/","title":{"rendered":"Long considered a \u201cclean\u201d energy source, hydropower can actually be bad for climate"},"content":{"rendered":"<p><a href=\"https:\/\/blogs.edf.org\/energyexchange\/wp-content\/blogs.dir\/38\/files\/2019\/11\/Hydro.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-medium wp-image-19748\" src=\"https:\/\/blogs.edf.org\/energyexchange\/wp-content\/blogs.dir\/38\/files\/2019\/11\/Hydro-300x199.jpg\" alt=\"\" width=\"300\" height=\"199\" srcset=\"https:\/\/blogs.edf.org\/energyexchange\/wp-content\/blogs.dir\/38\/files\/2019\/11\/Hydro-300x199.jpg 300w, https:\/\/blogs.edf.org\/energyexchange\/wp-content\/blogs.dir\/38\/files\/2019\/11\/Hydro-768x510.jpg 768w, https:\/\/blogs.edf.org\/energyexchange\/wp-content\/blogs.dir\/38\/files\/2019\/11\/Hydro-1024x680.jpg 1024w, https:\/\/blogs.edf.org\/energyexchange\/wp-content\/blogs.dir\/38\/files\/2019\/11\/Hydro.jpg 1200w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>A new EDF study published this week in <a href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/acs.est.9b05083\"><em>Environmental Science and Technology<\/em><\/a> shows that hydropower \u2014 the leading renewable energy technology projected to grow rapidly \u2014 is not always as good for the climate as broadly assumed. Moreover, continuing to assume that it <em>is<\/em> could mean that projects meant to reduce greenhouse emissions will unintentionally increase them instead.<\/p>\n<p>Motivated by pervasive misconceptions of the climate impacts of hydropower, we assessed the warming impacts over time of sustained greenhouse gas emissions estimated from nearly 1,500 existing hydropower plants around the globe. We also looked at the implications of future hydropower development.<\/p>\n<p><!--more--><\/p>\n<p>If minimizing climate impacts are not a priority in the design, construction and geographic placement of new hydropower facilities, we could end up generating electricity that yields more warming \u2014 especially in the near-term \u2014 than fossil fuels.<\/p>\n<p><strong>How hydropower can be worse for the climate than fossil fuels<\/strong><\/p>\n<p><a href=\"https:\/\/www.eia.gov\/energyexplained\/hydropower\/\">Hydropower<\/a> is produced when water stored behind a dam is released, using the power of gravity to spin turbines, which generate electricity. There is no fossil fuel burning or smokestacks involved. Which is why, on average, electricity from a hydropower facility has a smaller carbon footprint per unit of energy than electricity generated from fossil fuels.<\/p>\n<span class='bctt-click-to-tweet'><span class='bctt-ctt-text'><a href='https:\/\/x.com\/intent\/tweet?url=https%3A%2F%2Fblogs.edf.org%2Fenergyexchange%2F2019%2F11%2F15%2Flong-considered-a-clean-energy-source-hydropower-can-actually-be-bad-for-climate%2F&#038;text=Long%20considered%20a%20%E2%80%9Cclean%E2%80%9D%20energy%20source%2C%20hydropower%20can%20actually%20be%20bad%20for%20climate%20&#038;via=EDFEnergyEx&#038;related=EDFEnergyEx' target='_blank'rel=\"noopener noreferrer\">Long considered a \u201cclean\u201d energy source, hydropower can actually be bad for climate  <\/a><\/span><a href='https:\/\/x.com\/intent\/tweet?url=https%3A%2F%2Fblogs.edf.org%2Fenergyexchange%2F2019%2F11%2F15%2Flong-considered-a-clean-energy-source-hydropower-can-actually-be-bad-for-climate%2F&#038;text=Long%20considered%20a%20%E2%80%9Cclean%E2%80%9D%20energy%20source%2C%20hydropower%20can%20actually%20be%20bad%20for%20climate%20&#038;via=EDFEnergyEx&#038;related=EDFEnergyEx' target='_blank' class='bctt-ctt-btn'rel=\"noopener noreferrer\">Share on X<\/a><\/span>\n<p>But the reservoirs where water is stored also produce both carbon dioxide and <a href=\"https:\/\/www.edf.org\/climate\/methane-other-important-greenhouse-gas\">methane<\/a> (an even more potent greenhouse gas, with over 80 times the warming power of CO2 for the first 20 years after it\u2019s released). Both carbon dioxide and methane are released when vegetation decomposes under water. And here, there are enormous differences from facility to facility due to a range of varying reservoir features and meteorological characteristics.<\/p>\n<p>Some hydropower reservoirs are actually carbon sinks, taking in more carbon through photosynthesis by organisms living in the water than they emit through decomposition, while others have carbon footprints equal to or greater than, fossil fuels. In fact, of the nearly 1,500 plants worldwide that we examined and account for half of global hydropower generation, more than 100 facilities have greenhouse gas emissions that cause more warming than fossil fuels.<\/p>\n<p>Further, some regions, such as Africa and India, have proportionally more plants with high greenhouse gas emissions from hydropower compared to the rest of the world. Unfortunately, these also happen to be hotspots for future hydropower growth. For example, electricity generation from hydropower in India is projected to increase by 230% between 2015 and 2040.<\/p>\n<p><strong>Timeframes matter<\/strong><\/p>\n<p>It is also important to note that if we are building new hydropower facilities with the expectation of climate benefits, those benefits will be significantly smaller in the near-term than over the long haul. This is due to methane emissions\u2019 powerful near term impacts, and also the large amount of carbon dioxide released from newly-flooded reservoirs.<\/p>\n<p>For example, after 50 years of operation, a hydropower facility could cause less than 40% of the warming that would be caused by a coal-fired plant. But in the first decade after the hydro facility is built, it could cause more warming than a coal-fired power plant. Our study finds that over 200 existing hydropower facilities across the globe potentially cause more warming in the near-term than fossil fuel plants.<\/p>\n<p><strong>Why it matters and what to do<\/strong><\/p>\n<p>Despite the rapid growth of wind and solar, hydropower accounts for two-thirds of renewable energy generation worldwide. Thousands of new hydro facilities are either planned or under construction globally. The International Energy Agency predicts that hydropower could grow by nearly 80% by 2040 as society works to displace fossil fuels.<\/p>\n<p>Our research shows why it is important to ensure that future hydropower projects don\u2019t hurt, but help, the climate. For example, if new hydropower plants in India have greenhouse gas emissions properties similar to existing Indian hydro plants, they could be worse for the climate than emissions from average natural gas plants over the first 50 years of operation, due to methane emissions as well as carbon dioxide emissions from reservoir creation.<\/p>\n<p>There are things that can be done when planning a new hydropower project that can help keep emissions down.<br \/>\nFor example, if a facility draws from a large reservoir, but generates a relatively small amount of electricity \u2013 it\u2019s likely to produce disproportionate greenhouse gas emissions. Keeping this ratio in mind is a valuable part of the planning process as this \u201cpower density\u201d has been found to be the best indicator of overall greenhouse gas emissions from hydropower facilities.<\/p>\n<p>Temperature of the reservoir water can also play a role in the production of methane emissions, and therefore avoiding development in extremely hot places could also lower emissions.<\/p>\n<p>Overall, we must dispel the myth that hydropower is universally low-carbon, and be mindful of the potential for high emissions when developing new facilities. This paper gives us a more effective way to assess these projects so we can ensure new developments deliver climate benefits and not disbenefits.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A new EDF study published this week in Environmental Science and Technology shows that hydropower \u2014 the leading renewable energy technology projected to grow rapidly \u2014 is not always as good for the climate as broadly assumed. Moreover, continuing to assume that it is could mean that projects meant to reduce greenhouse emissions will unintentionally &#8230;<\/p>\n","protected":false},"author":40054,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[55717],"tags":[663],"coauthors":[],"class_list":["post-19744","post","type-post","status-publish","format-standard","hentry","category-methane-2","tag-water"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Long considered a \u201cclean\u201d energy source, hydropower can actually be bad for climate - Energy Exchange<\/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:\/\/blogs.edf.org\/energyexchange\/2019\/11\/15\/long-considered-a-clean-energy-source-hydropower-can-actually-be-bad-for-climate\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Long considered a \u201cclean\u201d energy source, hydropower can actually be bad for climate - Energy Exchange\" \/>\n<meta property=\"og:description\" content=\"A new EDF study published this week in Environmental Science and Technology shows that hydropower \u2014 the leading renewable energy technology projected to grow rapidly \u2014 is not always as good for the climate as broadly assumed. Moreover, continuing to assume that it is could mean that projects meant to reduce greenhouse emissions will unintentionally ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.edf.org\/energyexchange\/2019\/11\/15\/long-considered-a-clean-energy-source-hydropower-can-actually-be-bad-for-climate\/\" \/>\n<meta property=\"og:site_name\" content=\"Energy Exchange\" \/>\n<meta property=\"article:published_time\" content=\"2019-11-15T20:45:17+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2019-11-15T22:14:13+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/blogs.edf.org\/energyexchange\/wp-content\/blogs.dir\/38\/files\/2019\/11\/Hydro-300x199.jpg\" \/>\n<meta name=\"author\" content=\"Ilissa Ocko\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@ilissaocko\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Ilissa Ocko\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/blogs.edf.org\\\/energyexchange\\\/2019\\\/11\\\/15\\\/long-considered-a-clean-energy-source-hydropower-can-actually-be-bad-for-climate\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/blogs.edf.org\\\/energyexchange\\\/2019\\\/11\\\/15\\\/long-considered-a-clean-energy-source-hydropower-can-actually-be-bad-for-climate\\\/\"},\"author\":{\"name\":\"Ilissa Ocko\",\"@id\":\"https:\\\/\\\/blogs.edf.org\\\/energyexchange\\\/#\\\/schema\\\/person\\\/0157686ede269eea903c874a6ea5cf1f\"},\"headline\":\"Long considered a \u201cclean\u201d energy source, hydropower can actually be bad for climate\",\"datePublished\":\"2019-11-15T20:45:17+00:00\",\"dateModified\":\"2019-11-15T22:14:13+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/blogs.edf.org\\\/energyexchange\\\/2019\\\/11\\\/15\\\/long-considered-a-clean-energy-source-hydropower-can-actually-be-bad-for-climate\\\/\"},\"wordCount\":826,\"image\":{\"@id\":\"https:\\\/\\\/blogs.edf.org\\\/energyexchange\\\/2019\\\/11\\\/15\\\/long-considered-a-clean-energy-source-hydropower-can-actually-be-bad-for-climate\\\/#primaryimage\"},\"thumbnailUrl\":\"http:\\\/\\\/blogs.edf.org\\\/energyexchange\\\/wp-content\\\/blogs.dir\\\/38\\\/files\\\/2019\\\/11\\\/Hydro-300x199.jpg\",\"keywords\":[\"Water\"],\"articleSection\":[\"Methane\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/blogs.edf.org\\\/energyexchange\\\/2019\\\/11\\\/15\\\/long-considered-a-clean-energy-source-hydropower-can-actually-be-bad-for-climate\\\/\",\"url\":\"https:\\\/\\\/blogs.edf.org\\\/energyexchange\\\/2019\\\/11\\\/15\\\/long-considered-a-clean-energy-source-hydropower-can-actually-be-bad-for-climate\\\/\",\"name\":\"Long considered a \u201cclean\u201d energy source, hydropower can actually be bad for climate - 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