{"id":1399,"date":"2019-09-25T09:35:57","date_gmt":"2019-09-25T09:35:57","guid":{"rendered":"https:\/\/www.trccompanies.com\/insights\/why-coal-ash-impoundments-make-great-solar-sites\/"},"modified":"2025-02-13T14:44:51","modified_gmt":"2025-02-13T14:44:51","slug":"why-coal-ash-impoundments-make-great-solar-sites","status":"publish","type":"news-and-insights","link":"https:\/\/www.trccompanies.com\/fr\/insights\/why-coal-ash-impoundments-make-great-solar-sites\/","title":{"rendered":"Why Coal Ash Impoundments and Landfills Make Great Solar Sites"},"content":{"rendered":"<!-- Start Block: acf\/wysiwyg -->\n\n<section class=\"wysiwyg section-padding bg-white\">\n    <div class=\"container-fluid\">\n        \n        <div class=\"row\">\n                            <div class=\"col-lg-8 columns js-animated-content animated-content\">\n                                        <p>Renewable energy is continuing to grow at a rapid clip in the United States, with more than 10 GW of solar photovoltaic capacity added to the grid in 2018. \u00a0The continued growth of solar provides an opportunity for power generators and developers to utilize existing assets \u2013 namely closed-in-place (CIP) coal combustion residual (CCR) units (coal ash ponds and landfills) \u2013 to site solar facilities.<\/p>\n<p>According to the Environmental Protection Agency, there are more than 310 CCR landfills and 735 CCR ponds in the United States. Some of them are closed and hundreds more will be closing over the next several years, presenting the opportunity to site solar facilities on these otherwise underutilized pieces of land.<\/p>\n<p>So why do coal ash units make such good locations for utility-scale solar farms?<\/p>\n<p>First off, the size is right.\u00a0Coal ash landfills and ponds average 120 and 50 acres, respectively, with many much larger. Assuming five acres per MW of solar, these areas are generally suitable for distributed generation scale solar farms of at least 10 MW. Some may be able to accommodate arrays of 100 MW or more.<\/p>\n<p>Secondly, interconnection is already in place, whether the facility is continuing to generate power or if it has been shut down but has an active switchyard\/substation. This is normally one of the most challenging aspects of siting distributed generation and utility-scale solar.<\/p>\n<p>Finally, permitting can prove easier since the sites are already zoned for industrial use. That often makes it easier to build community support for the project than if building on a greenfield or similar space in a different part of town.<\/p>\n                <\/div>\n                <div class=\"col-lg-4 columns js-animated-content animated-content\">\n                                        <div class=\"wysiwyg__links js-animated-content animated-content\">\n                        <div class=\"wysiwyg__links__top \">\n                                                        <h4>Related Services<\/h4>\n                                                                                    <ul class=\"js-animated-content animated-content\">\n                                                                <li><a href=\"https:\/\/www.trccompanies.com\/services\/remediation-and-materials-management\/coal-ash-management\/\" target=\"_self\">Coal Ash Management<\/a><\/li>\n                                                                <li><a href=\"https:\/\/www.trccompanies.com\/services\/remediation-and-materials-management\/re-power-for-transitioning-and-transforming-power-plant-sites\/\" target=\"_self\">RE POWER\u00ae<\/a><\/li>\n                                                                <li><a href=\"https:\/\/www.trccompanies.com\/services\/remediation-and-materials-management\/\" target=\"_self\">Remediation &amp; Materials Management<\/a><\/li>\n                                                                <li><a href=\"https:\/\/www.trccompanies.com\/markets\/power-and-utilities\/renewables\/solar-power-development\/\" target=\"_self\">Solar Power Development<\/a><\/li>\n                                                            <\/ul>\n                                                    <\/div>\n                                                                                                            <div class=\"wysiwyg__links__bottom\">\n                                    <a href=\"https:\/\/www.trccompanies.com\/services\" target=\"_self\">View All Services<\/a>\n                                <\/div>\n                                                                                                <\/div>\n                <\/div>\n                    <\/div>\n\n            <\/div>\n<\/section>\n<!-- End Block: acf\/wysiwyg -->\n\n<!-- Start Block: acf\/wysiwyg -->\n\n<section class=\"wysiwyg section-padding bg-purple\">\n    <div class=\"container-fluid\">\n                    <div class=\"wysiwyg__wrapper\">\n        \n        <div class=\"row\">\n                        <div class=\"col-lg-12\">\n                                                                                \n                                                <\/div>\n\n                            <div class=\"col-lg-12 js-animated-content animated-content\">\n                    <h2 style=\"text-align: center;\">Factors to Consider<\/h2>\n<p style=\"text-align: center;\">When considering a CCR unit as a potential site for distributed and utility-scale solar power generation, it\u2019s important to account for the following:<\/p>\n                <\/div>\n                                <\/div>\n\n                    <\/div>\n            <\/div>\n<\/section>\n<!-- End Block: acf\/wysiwyg -->\n\n<!-- Start Block: acf\/innerpage-half-text-half-image -->\n\n<section class=\"half-and-half flex-row section-padding image-block-left bg-white text-column-one image-size-cover\">\n    <div class=\"half-and-half-image\">\n        <div class=\"half-and-half-image__wrap\">\n                                                <img decoding=\"async\" width=\"1024\" height=\"575\" src=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-2158054241-1024x575.jpg\" class=\"object-fit\" alt=\"GettyImages-2158054241\" srcset=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-2158054241-1024x575.jpg 1024w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-2158054241-300x169.jpg 300w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-2158054241-768x432.jpg 768w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-2158054241-1536x863.jpg 1536w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-2158054241-2048x1151.jpg 2048w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-2158054241-1068x600.jpg 1068w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>                                    <\/div>\n    <\/div>\n    \n    <div class=\"half-and-half-text\">\n        <div class=\"half-and-half-text__wrapper js-animated-content animated-content\">\n                                        <h3>Regulatory Matters<\/h3>\n<p>Closure compliance is a must for both the unit owner and the solar developer . The closure must comply with federal (40 CFR 257, Subpart D) and state CCR regulations, as well as with other unit-specific requirements (such as landfill requirements), including cap requirements, post-closure care (if applicable), and ancillary plans (SWPPP, NPDES, etc.). It is especially important for a third-party developer to demonstrate this compliance to secure financing and limit future liability.<\/p>\n                    <\/div>\n    <\/div>\n<\/section>\n<!-- End Block: acf\/innerpage-half-text-half-image -->\n\n<!-- Start Block: acf\/innerpage-half-text-half-image -->\n\n<section class=\"half-and-half flex-row section-padding image-block-right flex-opposite bg-white text-column-one image-size-cover\">\n    <div class=\"half-and-half-image\">\n        <div class=\"half-and-half-image__wrap\">\n                                                <img decoding=\"async\" width=\"1024\" height=\"767\" src=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-2042546258-1024x767.jpg\" class=\"object-fit\" alt=\"GettyImages-2042546258\" srcset=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-2042546258-1024x767.jpg 1024w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-2042546258-300x225.jpg 300w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-2042546258-768x575.jpg 768w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-2042546258-1536x1150.jpg 1536w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-2042546258-801x600.jpg 801w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-2042546258.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>                                    <\/div>\n    <\/div>\n    \n    <div class=\"half-and-half-text\">\n        <div class=\"half-and-half-text__wrapper js-animated-content animated-content\">\n                                        <h3>Engineering and Design<\/h3>\n<ul>\n<li>Closure status: Units that have already been closed in place must be evaluated to ascertain cap thickness, materials, slope, construction, etc., to ensure the solar array design, especially the racking and cabling systems, can be accommodated. For units yet to be closed, the final cap design can be modified to accommodate the selected solar design, while still meeting the CCR technical design requirements.<\/li>\n<li>CCR characteristics: The heterogeneity of the CCR material should be reviewed, especially for new CIP approaches, because it can affect the load-bearing capacity of the impoundment. More robust CIP activities can also decrease the chances that significant settlement of the cover system will occur.<\/li>\n<li>Slope characteristics: Most current racking systems are designed for a maximum 15 percent slope, but new designs are coming out quickly as the solar industry continues to mature. Designing cover systems with gentler slopes and constructing the slopes to be more robust and less prone to slippage can provide increased area for solar development, thereby maximizing the potential of each site.<\/li>\n<li>Permitting and risk management issues: Because CCR sites are already developed, it reduces the risk of impacting sensitive environmental and ecological systems. In addition, much of the information about site conditions has probably already been gathered. This can reduce the time required to obtain permits and make the project more attractive to government and community stakeholders compared with building in an undeveloped area, such as an agricultural field.<\/li>\n<li>Stormwater management: For sites already closed, careful consideration must be given to existing stormwater conveyances and the potential impact the solar array will have on stormwater controls. It is paramount that the array not increase the chance of erosion, which could lead to cap breaches and increase maintenance costs. For newly planned CIP sites, the stormwater controls to accommodate the solar array can be designed directly into the cover system.<\/li>\n<\/ul>\n                    <\/div>\n    <\/div>\n<\/section>\n<!-- End Block: acf\/innerpage-half-text-half-image -->\n\n<!-- Start Block: acf\/innerpage-half-text-half-image -->\n\n<section class=\"half-and-half flex-row section-padding image-block-left bg-white text-column-one image-size-cover\">\n    <div class=\"half-and-half-image\">\n        <div class=\"half-and-half-image__wrap\">\n                                                <img decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1399694327-1024x683.jpg\" class=\"object-fit\" alt=\"GettyImages-1399694327\" srcset=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1399694327-1024x683.jpg 1024w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1399694327-300x200.jpg 300w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1399694327-768x512.jpg 768w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1399694327-1536x1024.jpg 1536w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1399694327-2048x1365.jpg 2048w, https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/GettyImages-1399694327-900x600.jpg 900w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>                                    <\/div>\n    <\/div>\n    \n    <div class=\"half-and-half-text\">\n        <div class=\"half-and-half-text__wrapper js-animated-content animated-content\">\n                                        <h3>Construction and Cap Maintenance<\/h3>\n<ul>\n<li>Construction methods and equipment: Protection of the cover system is extremely important during construction of the solar array, which is likely to be the activity with the greatest potential to damage a cap.\n<ul>\n<li>Over sizing equipment pads to reduce bearing weight is a good practice, as well as placing transformers off the cap altogether.<\/li>\n<li>Trenching for stringer lines \u2013 if they\u2019re not to be placed in cable trays \u2013 should be done with toothless buckets, and hand excavation should be used to locate geomembrane layers.<\/li>\n<li>Low pressure equipment should be used, and equipment and materials should be deployed from off the cap (for example, using a concrete pumper to pour ballasts in place).<\/li>\n<\/ul>\n<\/li>\n<li>Inspections and communications: As with any project, unforeseen conditions and challenges will arise during construction of both the cover system and solar array. Routine construction inspections and stakeholder communication is key to managing these occurrences quickly and efficiently.<\/li>\n<li>Vegetation and wildlife management: Larger impoundments and landfills repurposed for solar power generation may also be\u00a0<a class=\"external\" href=\"https:\/\/www.nrel.gov\/news\/features\/2019\/beneath-solar-panels-the-seeds-of-opportunity-sprout.html\" target=\"_blank\" rel=\"noopener\">an opportunity for habitat enhancement<\/a>. Pollinator habitats can be designed into peripheral areas, and areas between the panels may be usable as pastureland (i.e., agrivoltaics).<\/li>\n<\/ul>\n                    <\/div>\n    <\/div>\n<\/section>\n<!-- End Block: acf\/innerpage-half-text-half-image -->\n\n<!-- Start Block: acf\/wysiwyg -->\n\n<section class=\"wysiwyg section-padding bg-light-gradient\">\n    <div class=\"container-fluid\">\n                    <div class=\"wysiwyg__wrapper\">\n        \n        <div class=\"row\">\n                        <div class=\"col-lg-12\">\n                                                                                \n                                                <\/div>\n\n                            <div class=\"col-lg-12 js-animated-content animated-content\">\n                    <h2>Summary<\/h2>\n<p>CCR units can provide readily available solar sites with the added benefit of utilizing existing infrastructure to reduce costs.\u00a0 They are also ideal for repurposing industrial land in lieu of greenfield development. For closed CCR units, a thorough engineering evaluation should be done on the existing cap to determine the feasibility of siting a solar array.\u00a0 For CCR units yet to be closed, the final cap can be designed to minimize costs and maximize the PV array, while complying with state and federal CCR requirements.<\/p>\n<p><em>Learn more about TRC\u2019s comprehensive\u00a0<a href=\"https:\/\/www.trccompanies.com\/markets\/power-and-utilities\/renewables\/\" target=\"_blank\" rel=\"noopener noreferrer\">renewable energy development<\/a>\u00a0solutions and our proven engineering, construction and environmental strategies for\u00a0<a href=\"https:\/\/www.trccompanies.com\/services\/remediation-and-materials-management\/coal-ash-management\/\" target=\"_blank\" rel=\"noopener noreferrer\">coal ash management<\/a>. \u00a0<\/em><\/p>\n<p><em>And don\u2019t miss our\u00a0<a href=\"https:\/\/solar.trccompanies.com\/\" target=\"_blank\" rel=\"noopener noreferrer\">Southeast Solar Conference<\/a>\u00a0in Atlanta October 16-17. This event brings together landowners, developers and industry leaders for dynamic discussions and professional networking to advance solar energy generation in new areas of the Southeast.<\/em><\/p>\n                <\/div>\n                                <\/div>\n\n                    <\/div>\n            <\/div>\n<\/section>\n<!-- End Block: acf\/wysiwyg -->\n\n<!-- Start Block: acf\/innerpage-cta-bar -->\n<section class=\"global-cta innerpage-cta cta-purple\">\n    <div class=\"container-fluid\">\n        <div class=\"global-cta-wrapper  \">\n                                            <h2>S&rsquo;adapter au <br>changement<\/h2>\n                                <div class=\"global-cta-image\">\n                    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" width=\"316.566\" height=\"369\" viewBox=\"0 0 316.566 369\">\n                        <defs>\n                            <pattern id=\"pattern\" width=\"1\" height=\"1\" viewBox=\"117.006 0 316.566 369\">\n                                <image preserveAspectRatio=\"xMidYMid slice\" width=\"655.35\" height=\"369\" href=\"https:\/\/www.trccompanies.com\/wp-content\/uploads\/2024\/08\/Concept-of-container-Li-ion-energy-storage-system-891416454-resized.webp\"><\/image>\n                            <\/pattern>\n                        <\/defs>\n                        <path id=\"Union_8\" data-name=\"Union 8\" d=\"M72.087,369,206.869,190.294h109.7L182.891,369ZM0,195.818H68.4l28.66,44.507L68.4,286.43Zm0-10.747L68.4,94.466l28.66,46.1L68.4,185.071Zm205.769-6.365L72.087,0h109.7L316.566,178.706Z\" fill=\"url(#pattern)\"\/>\n                    <\/svg>\n                <\/div>\n                <div class=\"global-cta-content\">\n                    <p>Collaborez avec les praticiens test\u00e9s de TRC<\/p>\n                    <p>\n                        <a href=\"https:\/\/www.trccompanies.com\/contact-us\/\" title=\"Contact Us\" class=\"btn btn-primary\" >Contact Us<\/a>                    <\/p>\n                <\/div>\n                        \n        <\/div>\n    <\/div>\n<\/section>\n\n<!-- End Block: acf\/innerpage-cta-bar -->","protected":false},"excerpt":{"rendered":"<p>Hundreds of coal ash sites are set to close over the next decade and could make ideal, low-impact locations for utility-scale solar farms.<\/p>\n","protected":false},"featured_media":5862,"template":"","tags":[162,301,305,320],"news-and-insights-category":[363],"services-category":[1005,996,993],"custom_category":[],"class_list":["post-1399","news-and-insights","type-news-and-insights","status-publish","has-post-thumbnail","hentry","tag-coal-ash-management","tag-remediation-and-materials-management","tag-renewables","tag-solar-power-development","news-and-insights-category-insights","services-category-electrical-and-power","services-category-procurement-construction-solutions","services-category-remediation-materials-management"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Why Coal Ash Impoundments Make Great Solar Sites | TRC<\/title>\n<meta name=\"description\" content=\"Hundreds of coal ash sites are set to close over the next decade and could make ideal, low-impact locations for utility-scale solar farms.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.trccompanies.com\/fr\/insights\/why-coal-ash-impoundments-make-great-solar-sites\/\" \/>\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why Coal Ash Impoundments Make Great Solar Sites | TRC\" \/>\n<meta property=\"og:description\" content=\"Hundreds of coal ash sites are set to close over the next decade and could make ideal, low-impact locations for utility-scale solar 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