{"id":765,"date":"2019-10-08T12:03:24","date_gmt":"2019-10-08T19:03:24","guid":{"rendered":"https:\/\/solarpowergenie.com\/?p=765"},"modified":"2023-02-10T01:48:55","modified_gmt":"2023-02-10T09:48:55","slug":"which-direction-should-solar-panels-face","status":"publish","type":"post","link":"https:\/\/solarpowergenie.com\/which-direction-should-solar-panels-face\/","title":{"rendered":"Which Direction Should Solar Panels Face?"},"content":{"rendered":"<style>img#mv-trellis-img-1::before{padding-top:66.666666666667%; }img#mv-trellis-img-1{display:block;}<\/style>\n<p>The sale and installation of solar panels\naround the world continues to be a booming economy, with an estimated 250\ngigawatts of energy now available via solar panels.&nbsp; Experts expect that figure to approach 4500\ngigawatts by 2050. The cost has continued to drop to where solar panel prices are easily in\nthe range of the average homeowner, who may or may not know enough about solar panels to get the best benefit from them.\n<\/p>\n\n\n\n<p>Which\ndirection should solar panels face?&nbsp; <strong>The direction solar panels should face is\neither south or west.<\/strong> <strong>Traditionally,\nthe best direction has always been south. &nbsp;But new research favors the west when applying\nsupply-and-demand factors. East is not considered a good choice, and north is\ntotally out of the question.<\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><noscript><img loading=\"lazy\" decoding=\"async\" width=\"924\" height=\"616\" src=\"https:\/\/solarpowergenie.com\/wp-content\/uploads\/2019\/10\/which-direction-should-solar-panels-face-1024.jpg\" alt=\"Which direction should solar panels face?\" class=\"wp-image-806\" srcset=\"https:\/\/solarpowergenie.com\/wp-content\/uploads\/2019\/10\/which-direction-should-solar-panels-face-1024.jpg 924w, https:\/\/solarpowergenie.com\/wp-content\/uploads\/2019\/10\/which-direction-should-solar-panels-face-1024-300x200.jpg 300w, https:\/\/solarpowergenie.com\/wp-content\/uploads\/2019\/10\/which-direction-should-solar-panels-face-1024-768x512.jpg 768w, https:\/\/solarpowergenie.com\/wp-content\/uploads\/2019\/10\/which-direction-should-solar-panels-face-1024-1024x683.jpg 1024w\" sizes=\"(max-width: 760px) calc(100vw - 20px), 720px\"><\/noscript><img loading=\"eager\" decoding=\"async\" width=\"924\" height=\"616\" src=\"data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20viewBox='0%200%20924%20616'%3E%3Crect%20width='924'%20height='616'%20style='fill:%23e3e3e3'\/%3E%3C\/svg%3E\" alt=\"Which direction should solar panels face?\" class=\"wp-image-806 eager-load\" sizes=\"(max-width: 760px) calc(100vw - 20px), 720px\" data-pin-media=\"https:\/\/solarpowergenie.com\/wp-content\/uploads\/2019\/10\/which-direction-should-solar-panels-face-1024.jpg\" id=\"mv-trellis-img-1\" data-src=\"https:\/\/solarpowergenie.com\/wp-content\/uploads\/2019\/10\/which-direction-should-solar-panels-face-1024.jpg.webp\" data-srcset=\"https:\/\/solarpowergenie.com\/wp-content\/uploads\/2019\/10\/which-direction-should-solar-panels-face-1024.jpg.webp 924w, https:\/\/solarpowergenie.com\/wp-content\/uploads\/2019\/10\/which-direction-should-solar-panels-face-1024-300x200.jpg.webp 300w, https:\/\/solarpowergenie.com\/wp-content\/uploads\/2019\/10\/which-direction-should-solar-panels-face-1024-768x512.jpg.webp 768w, https:\/\/solarpowergenie.com\/wp-content\/uploads\/2019\/10\/which-direction-should-solar-panels-face-1024-1024x683.jpg.webp 1024w\" data-svg=\"1\" data-trellis-processed=\"1\"><\/figure><\/div>\n\n\n<p>There are dozens of factors that need to be considered when installing solar panels, not the least of which being the direction they face.  Factors like climate, obstructions, trees, and surrounding terrain go into the equation, making some homes and some techniques more suitable for solar panel installation than others.  An often overlooked factor is being able to match electrical demand with production.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Follow the Sun<\/h2>\n\n\n\n<p>Southern exposure is a valuable commodity in\nreal estate.&nbsp; The most flattering light\nfor a home or storefront generally comes from the south.&nbsp; Eastern-facing structures receive full-on sun\nin the mornings, and western-facing structures have it in the afternoons.&nbsp; But the southern exposure receives sunlight,\nalbeit at various angles, all day long, from dawn to dusk.&nbsp; By contrast, a building or home with a\nnorthern exposure would always be in the shadows.<\/p>\n\n\n\n<p>Based on that factor, conventional wisdom has\nsaid to face solar panels south. And it would not be wrong to do so.&nbsp; Installations go on every day with the panels\nfacing south.&nbsp; But is that the absolute\nbest?<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Is West Best?<\/h3>\n\n\n\n<p>While it&rsquo;s true that solar panels will receive\nmore light overall when oriented toward the south, it doesn&rsquo;t necessarily equal\nmore electricity at the crucial time it&rsquo;s needed.&nbsp; As solar-equipped homes are normally part of\nthe community energy grid, the important factor is not the raw numbers of\npotential electrical production, but the reduction in demand across the entire\ngrid.<\/p>\n\n\n\n<p>The solar panels on top of your house may have\nall this potential energy available at 10:00 a.m., but it isn&rsquo;t much help to a\ngrid system that is easily keeping up with demand at that time of day.&nbsp; But in the afternoon, when demand typically\npeaks, the grid can use all the help it can get from the homes with solar\npower.<\/p>\n\n\n\n<p>So the theory is, face the solar panels west\nso that they receive full-on sun at the time when the energy is needed the\nmost.&nbsp; South-facing panels receive\nglancing blows of sunlight all day long, but at the critical time of the day,\nthe real solar action is in the west.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Pecan Street Research Institute\nReport<\/h3>\n\n\n\n<p>The Pecan Street Research Institute blew a\nhole in a lot of theories regarding solar energy production and the direction\nsolar panels face when it extracted numbers that took supply and demand into\naccount.<\/p>\n\n\n\n<p>What researchers were looking for was the impact that solar energy production had in reducing demand across the power grid.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><em>&ldquo;The research is the first of its kind to evaluate the energy production of solar panels oriented in different directions.&nbsp; Pecan Street analyzed 50 homes in the Austin, TX area.&nbsp; Some had only south-facing panels, others had west-facing panels, and some had both.<\/em><br> <em>&nbsp;<\/em><br><em>South-facing panels produced a 54 percent reduction overall, while west-facing solar PV panels produced a 65 percent peak reduction.&rdquo;<\/em> <\/p><cite>Katherine Tweed, Greentech Media <\/cite><\/blockquote>\n\n\n\n<p>From the standpoint that solar panels produce\nenergy on demand as it&rsquo;s being consumed, the Pecan Street project determined\nthat west-facing panels produced 49 percent more energy than south-facing\npanels.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">TOU &ndash; Time of Use Pricing<\/h3>\n\n\n\n<p>The impact solar energy production has had on\ntraditional energy grids is widespread and is morphing into many components\nthat offer more and more ways for consumers to save money.&nbsp; Tax incentives in various forms have been in\nplace for some time, rewarding homeowners who install their solar panels with a\ntax credit or tax deduction.&nbsp; Some\nincentives are set to expire soon but may be replaced with new ones.<\/p>\n\n\n\n<p>A growing trend in many places across the\ncountry is the adoption of Time-of-Use Pricing (TOU), meaning energy that is\nused during peak hours is more expensive than at other times of the day.<\/p>\n\n\n\n<p>So for a homeowner with solar panels on his\nroof, being able to use solar power rather than power from the utility company\nduring peak hours results in significant savings.&nbsp; For the most part, peak time &ndash; as it was in\nthe Austin, Texas research project &ndash; is 3:00 to 7:00 p.m.<\/p>\n\n\n\n<p>At that time of day, of course, the sun is in\nthe west, so orienting your solar panels in that direction makes a lot of\nsense.&nbsp; The question could be asked about\nthe effectiveness of aiming solar panels to the east.&nbsp; While the sun would shine directly onto the\npanels in the morning hours, the demand is less, and therefore, the actual\noutput would be diminished by the relative shortfall in demand.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Roof Pitch Makes a Difference<\/h3>\n\n\n\n<p>It&rsquo;s the age-old paradox of fashion versus\nfunction.&nbsp; American homes, in particular,\nreflect the housing trends that were in play at the time of construction,\nranging from Victorian to ranch, with stops along the way at French provincial\nand Tudor.<\/p>\n\n\n\n<p>It&rsquo;s a safe bet that the builder of any home\nbuilt before the mid-2010s would have given little regard to the pitch of the\nroof as it relates to the mounting of solar panels.&nbsp; Even now, any discussion of roof pitch is\ngoing to focus more on style or water-shedding than its suitability for as a\nplace upon which to mount solar panels.<\/p>\n\n\n\n<p>Research is lacking, but early indicators\nsupport the concept that solar panels installed on flat roofs, or on roofs with\na relatively low pitch, produce more energy than those mounted on steeply\npitched roofs.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Weather and Solar Panels<\/h3>\n\n\n\n<p>If you own solar-powered garden lights or\npathway lights, you&rsquo;ve probably that they don&rsquo;t last as long after dark\nfollowing a cloudy day as they do on a sunny day.&nbsp; If the day was particularly gloomy, they\nmight not light up at all.<\/p>\n\n\n\n<p>The same is true of solar panels, but not on\nthe scale as you might expect.&nbsp; While the\nsun is the source of the energy that is transitioned to electricity, the\nindividual solar cells don&rsquo;t necessarily require direct sunlight.&nbsp; The sun emits photons into the earth&rsquo;s\natmosphere, and it&rsquo;s the photons that react with the components of solar cells\nthat create the current.<\/p>\n\n\n\n<p>There&rsquo;s no question that direct sunlight is\nbest, however.&nbsp; On cloudy days, solar\ncells might produce only 25% of their normal capacity.&nbsp; On stormy, exceptionally gloomy days, the\noutput could be as little as 15% of capacity.<\/p><p>This article is owned by SolarPowerGenie.com and was first published on October 8, 2019<\/p>\n\n\n\n<p>Therefore, locales in Nevada, Utah, Arizona,\nand parts of California would be more conducive to solar panels, while places\nwith frequent clouds, like Washington, Oregon, and Florida (despite its\nnickname, The Sunshine State) would be less so. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Before You Buy<\/h3>\n\n\n\n<ol><li>Fix the roof.<\/li><li>Look for additional ways to save energy.<\/li><li>Know the two main ways to use solar power.<\/li><li>Confer with local power supplier about being connected to\n     the grid.<\/li><li>Hire an experienced installer who&rsquo;ll honor the warranty.<\/li><li>Sometimes leasing panels makes better sense.<\/li><li>Get the contract right.<\/li><\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Roof<\/h3>\n\n\n\n<p>The first obvious factor is whether your roof\nis structurally sound enough to support the weight of solar panels and whether\nit&rsquo;s in need of reshingling, or will be within a few years.&nbsp; Solar panels are no replacement for shingles\nand could make roof leaks worse if the shingles are worn out, so get all\nstructural shortcomings taken care of first. <\/p>\n\n\n\n<p>Your roof should be sunny for as much of the\nday as possible. If it&rsquo;s shaded by trees, nearby buildings or surrounding\nterrain (like a tall hill or mountain due west of your location), then solar\npanels might not work well enough to justify the expense.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Other Things You Can Do<\/h3>\n\n\n\n<p>Make sure your home is already\nenergy-efficient, with proper insulation, weather stripping, and other\nenergy-saving practices before embarking on a solar panel project.<\/p>\n\n\n\n<p>Good overall energy efficiency practices:<\/p>\n\n\n\n<ul><li>Attic insulation &ndash; 12 to 15 inches\nof insulation to bring to rating to R-38 or R-49<\/li><li>Energy-efficient doors and windows\n&ndash; Fiberglass and vinyl are better insulators than steel or wood.&nbsp; Gaskets and seals should be in good shape.<\/li><li>Close fireplace flues.&nbsp; Wood-burning fireplaces are infamous wasters\nof energy.&nbsp; Ventless gas logs can be set\nin the fireplace opening and provide more heat than a real fire.<\/li><li>Run AC at 74 degrees in the\nsummer, 68 degrees in the winter.<\/li><\/ul>\n\n\n\n<p>If your home is not energy efficient overall,\nputting solar panels will not produce the savings they otherwise could.&nbsp; Home energy checklists are available in\nnumerous locations and online.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Different Types of Solar Power<\/h3>\n\n\n\n<p>There are two basic types of solar\ntechnologies: photovoltaic and thermal.&nbsp;\nPhotovoltaic converts light into electricity and thermal uses sunlight\nto heat water or air for use inside the house.<\/p>\n\n\n\n<p>Most homes would be best served by the\nphotovoltaic process, but homes in extremely cold locales might do better if\nthe solar assist went into heating water or air.<\/p>\n\n\n\n<p>Photovoltaic is the easier of the two to\ninstall, and there are more experienced installers for this process.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Connecting to the Grid<\/h3>\n\n\n\n<p>The process differs by state, county, and\nmunicipality, so be sure to contact the local power supplier and whatever\ncommunity governing board may be in place to regulate hook-ups.<\/p>\n\n\n\n<p>In some communities, solar owners are\nreimbursed for energy that&rsquo;s consumed via their solar panels (and therefore\ndoes not come off the community power grid).&nbsp;\nOften the rate is the same rate as it would have been if it was the\nother way around &ndash; if the homeowner was drawing power from the grid.&nbsp; Also, determine the formula that is used for this\npurpose.&nbsp; Do you live in a state or city\nthat uses time-of-use billing?&nbsp; Find out\nbecause this can be a huge factor.<\/p>\n\n\n\n<p>Some states are far more generous than others\nwhen it comes to incentives and energy reimbursements, and it makes great sense\nto familiarize yourself with the state or city&rsquo;s policy before making the\ninvestment to purchase and install solar panels.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Find a Reputable Installer<\/h3>\n\n\n\n<p>With solar panels, the technology sometimes\noutpaces the competency, not only of the homeowners but also of would-be\ninstallers.&nbsp; In areas where solar\ninstallations are a novelty rather than an established practice, the issue of\nfinding an experienced installer becomes more difficult.<\/p>\n\n\n\n<p>It&rsquo;s a challenge, but try to find an installer\nwho will be around long enough to honor the warranty.&nbsp; There&rsquo;s not a lot to do with the solar panels\nregarding maintenance, but things sometimes break prematurely, and you want to\nhave someone to call when it does.<\/p>\n\n\n\n<p>Make sure that the supplier of solar panels\nalso services them, rather than contracting the service work out to a third\nparty.&nbsp; That third party may not even do\nregular business in your area.<\/p><p>This article is owned by SolarPowerGenie.com and was first published on October 8, 2019<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Lease or Buy?<\/h3>\n\n\n\n<p>It might never enter the minds of many buyers,\nbut the solar panels may outlive their residency at that particular address. &nbsp;For this and a few other reasons, leasing the\nsolar panels becomes a viable option.<\/p>\n\n\n\n<p>Lease terms vary, of course, but primarily,\nthe leasing company maintains ownership of the panels, and you pay the company\nfor the electricity used (at a rate less than that charged by the local energy\nprovider, of course).&nbsp; When the lease is\nup, or when you move, you walk away, and the leasing company takes back its\nsolar panels and associated hardware.<\/p>\n\n\n\n<p>The benefit of owning your own system is that\nall the energy savings go to you and no one else, and once the benefits exceed\nthe purchase price, you&rsquo;ll enjoy an unfettered rate of return.<\/p>\n\n\n\n<p>The panels themselves could last for 30 years\nor more, but the supporting electronics won&rsquo;t be able to match that\nperformance.&nbsp; That all needs to be\nfactored in your decision to lease or buy.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Contract<\/h3>\n\n\n\n<p>Your contract should detail the financing\nterms, warranties, and performance expectations. This may be new territory for\nyou, but it certainly isn&rsquo;t for the supplier, so don&rsquo;t be bashful about asking\nquestions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Solar Technology is Not As Cutting\nEdge as You Might Think<\/h3>\n\n\n\n<p>In 1839, Edmond Becquerel of France,\nexperimenting in his father&rsquo;s laboratory, created the world&rsquo;s first\nphotovoltaic cell.&nbsp; He found that\nelectrodes coated in silver chromide or silver bromide generated pulses of\ncurrent when exposed to light.<\/p>\n\n\n\n<p>The far-reaching possibilities of the\nphotovoltaic process were not fully realized for many years, but Becquerel\nbusied himself in many other disciplines regarding light and photochemistry.<\/p>\n\n\n\n<p>A century later, scientists made important\ndiscoveries in the same realm.&nbsp; Maria\nTelkes, a Hungarian who came to the U.S. in 1925, refined methods for\ngenerating and storing energy derived from solar sources, and in 1954, three\nresearchers hoping to produce a renewable battery for remote telephone use &ndash;\nchemist Calvin Fuller, physicist Gerald Pearson, and engineer Daryl Chapin\nbuilt a silicon solar cell.<\/p>\n\n\n\n<p>The first solar-powered phone call was placed\nOct. 4, 1955, using a bank of cells on a flat panel pointed at the sun. The\ndevice bears a strong resemblance to today&rsquo;s solar panels.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Composition of Solar Panels<\/h3>\n\n\n\n<p>Solar technology is clearly a &ldquo;green&rdquo;\ntechnology, but even the physical components of the solar panels are\nearth-friendly.&nbsp; Solar cells are made out\nof silicon, the second most abundant element in the earth&rsquo;s crust. (Oxygen\nbeing number one.)<\/p>\n\n\n\n<p>Silicon doesn&rsquo;t have to be mined. It can be\nproduced.&nbsp; It&rsquo;s &ldquo;grown&rdquo; in a tube as a\ncrystal, rolled out like salami, and cut by lasers into extremely thin wafers\nthat become the prominent element of a solar cell.<\/p>\n\n\n\n<p>Solar cells have efficiency ratings based on the amount of electricity converted per square inch of exposed space.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><em>&ldquo;Let&rsquo;s say you have 100 square feet available on your roof. In this limited space, if panels are 10 percent efficient, its less than 20 percent. Efficiency means how many electrons they can produce per square inch of silicon wafers. The more efficient they are, the more economics they can deliver.&rdquo;<\/em><\/p><cite>Robert Margolis, a senior energy analyst at the National Renewable Energy Laboratory <\/cite><\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">A Recent Discovery of Interest<\/h3>\n\n\n\n<p>While\nsilicon has proven to be a reliable root element in the manufacturing of solar\ncells, scientists continue to investigate new methods and new materials that\nmight be better than what is currently in place.&nbsp; For example, silicon has an upper limit of 29\npercent efficiency in converting light to energy.<\/p>\n\n\n\n<p>A mineral known as perovskite has been shown to achieve efficiency ratings of up to 20 percent, which is less than that of silicon, but it is much easier to artificially produce, and its light-to-energy process is much simpler. But the findings occurred in a sterile lab environment.&nbsp; Real-world capabilities are still under scrutiny. <\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\">\n\n\n\n<p>Title image by <a href=\"https:\/\/www.flickr.com\/photos\/waltstoneburner\/6170496511\/in\/photolist-apgpCT-qQTQfG-4cUNBm-fJsNQW-a7qwDV-d8muf-5EPcxw-eqfA6n-cYzNus-3CYFU-8DKfJu-5CsUyY-bUZpUc-dAVeN1-9mmM1d-3o5xG8-3rHKxa-aCrRdi-9NtWtb-bKHkXZ-aDFzKq-UmnqzQ-bMUqjB-fToHP-dQCSx8-9V19Tg-7TkNjq-9vvkeN-5RptxB-qxNehQ-5gRp3-brMgCJ-7TkMGU-aTghxP-4qJnqP-bMUrvV-qN5Aq3-ZEwSVt-4yVk4h-5tto69-55tKSn-6PqY5g-3vCnig-3vBJLK-9ia6EX-WMBh8F-9idkzL-9iae2Z-9iduXN-9ia9S8\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"Walt Stoneburner (opens in a new tab)\">Walt Stoneburner<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Related Articles<\/h2>\n\n\n\n<p><a href=\"https:\/\/solarpowergenie.com\/how-to-find-out-if-solar-panels-too-heavy-for-your-roof\/\">How to Find Out if Solar Panels are Too Heavy for Your Roof?<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/solarpowergenie.com\/how-weather-resistant-are-solar-panels\/\">How weather resistant are solar panels<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/solarpowergenie.com\/6-factors-that-affect-solar-panel-output\/\">6 Factors That Affect Solar Panel Output<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/solarpowergenie.com\/why-solar-pool-heating-is-worth-it\/\">Why Solar Pool Heating is Worth It<\/a><\/p><p>This article is owned by SolarPowerGenie.com and was first published on October 8, 2019<\/p>\n\n\n\n<p><a href=\"https:\/\/solarpowergenie.com\/how-to-install-solar-panels-on-a-flat-roof\/\">How to Install Solar Panels on a Flat Roof<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The sale and installation of solar panels around the world continues to be a booming economy, with an estimated 250 gigawatts of energy now available via solar panels.&nbsp; Experts expect that figure to approach 4500 gigawatts by 2050. The cost has continued to drop to where solar panel prices are easily in the range of &hellip;<\/p>\n","protected":false},"author":3,"featured_media":807,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","disable-in-feed":false,"article-schema-type":"","disable-critical-css":false},"categories":[7],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Which Direction Should Solar Panels Face? - SolarPowerGenie.com<\/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:\/\/solarpowergenie.com\/which-direction-should-solar-panels-face\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which Direction Should Solar Panels Face? - SolarPowerGenie.com\" \/>\n<meta property=\"og:description\" content=\"The sale and installation of solar panels around the world continues to be a booming economy, with an estimated 250 gigawatts of energy now available via solar panels.&nbsp; Experts expect that figure to approach 4500 gigawatts by 2050. 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