{"id":1849,"date":"2025-09-18T14:00:12","date_gmt":"2025-09-18T07:00:12","guid":{"rendered":"https:\/\/cergy.vn\/?p=1849"},"modified":"2025-09-18T14:00:33","modified_gmt":"2025-09-18T07:00:33","slug":"cach-tinh-cong-suat-he-thong-nang-luong-mat-troi-phu-hop-2-2","status":"publish","type":"post","link":"https:\/\/cergy.vn\/en\/cach-tinh-cong-suat-he-thong-nang-luong-mat-troi-phu-hop-2-2\/","title":{"rendered":"Why do people who install solar panels on their roofs have to register with EVN?"},"content":{"rendered":"<p data-start=\"61\" data-end=\"142\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\"><strong data-start=\"61\" data-end=\"140\">Why must rooftop solar systems for self-consumption be registered with EVN?<\/strong><\/span><\/p>\n<p data-start=\"144\" data-end=\"542\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">As electricity costs continue to rise and the trend toward green energy grows stronger, investing in solar power systems has become a smart choice for households, businesses, and production facilities. Cergy explains why even rooftop solar systems designed for self-consumption still need to be registered with EVN. Learn the reasons, legal requirements, and insights from experts and the public.<\/span><\/p>\n<p data-start=\"544\" data-end=\"792\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">According to a new proposal from Vietnam Electricity (EVN), households and organizations that install rooftop solar systems for self-production and self-consumption but fail to register or notify the authorities may face administrative penalties.<\/span><\/p>\n<p><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\"><span style=\"font-weight: 400;\">\u00a0<\/span><\/span><\/p>\n<figure id=\"attachment_1495\" aria-describedby=\"caption-attachment-1495\" style=\"width: 1024px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1495 size-full\" src=\"https:\/\/cergy.vn\/wp-content\/uploads\/2025\/06\/cach-tinh-cong-suat-dien-mat-troi.jpg\" alt=\"c\u00e1ch t\u00ednh c\u00f4ng su\u1ea5t \u0111i\u1ec7n m\u1eb7t tr\u1eddi\" width=\"1024\" height=\"768\" srcset=\"https:\/\/cergy.vn\/wp-content\/uploads\/2025\/06\/cach-tinh-cong-suat-dien-mat-troi.jpg 1024w, https:\/\/cergy.vn\/wp-content\/uploads\/2025\/06\/cach-tinh-cong-suat-dien-mat-troi-300x225.jpg 300w, https:\/\/cergy.vn\/wp-content\/uploads\/2025\/06\/cach-tinh-cong-suat-dien-mat-troi-768x576.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption id=\"caption-attachment-1495\" class=\"wp-caption-text\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">c\u00e1ch t\u00ednh c\u00f4ng su\u1ea5t \u0111i\u1ec7n m\u1eb7t tr\u1eddi<\/span><\/figcaption><\/figure>\n<h3 data-start=\"799\" data-end=\"843\"><span class=\"ez-toc-section\" id=\"How_to_calculate_solar_system_capacity\"><\/span><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">How to calculate solar system capacity<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"844\" data-end=\"921\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\"><strong data-start=\"844\" data-end=\"919\">Why is registration of rooftop solar self-consumption systems required?<\/strong><\/span><\/p>\n<h4 data-start=\"923\" data-end=\"979\"><span class=\"ez-toc-section\" id=\"1_Ensuring_electrical_safety_and_fire_protection\"><\/span><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">1. Ensuring electrical safety and fire protection<\/span><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p data-start=\"980\" data-end=\"1125\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Notification helps EVN and regulators collect accurate data, provide technical guidance, and monitor installations. This reduces risks such as:<\/span><\/p>\n<ul data-start=\"1126\" data-end=\"1298\">\n<li data-start=\"1126\" data-end=\"1185\">\n<p data-start=\"1128\" data-end=\"1185\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Reverse current into the grid, causing system failures.<\/span><\/p>\n<\/li>\n<li data-start=\"1186\" data-end=\"1250\">\n<p data-start=\"1188\" data-end=\"1250\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Local overloads, potentially leading to fires or explosions.<\/span><\/p>\n<\/li>\n<li data-start=\"1251\" data-end=\"1298\">\n<p data-start=\"1253\" data-end=\"1298\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Systems that fail to meet safety standards.<\/span><\/p>\n<\/li>\n<\/ul>\n<h4 data-start=\"1300\" data-end=\"1342\"><span class=\"ez-toc-section\" id=\"2_Load_management_and_grid_balance\"><\/span><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">2. Load management and grid balance<\/span><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p data-start=\"1343\" data-end=\"1517\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">A few households may not significantly impact the system. However, if millions of households install without registration, the national grid could face severe fluctuations:<\/span><\/p>\n<ul data-start=\"1518\" data-end=\"1649\">\n<li data-start=\"1518\" data-end=\"1570\">\n<p data-start=\"1520\" data-end=\"1570\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Sunny days: reduced grid demand \u2192 excess supply.<\/span><\/p>\n<\/li>\n<li data-start=\"1571\" data-end=\"1649\">\n<p data-start=\"1573\" data-end=\"1649\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Stormy or rainy days: households rely on the grid again \u2192 power shortages.<\/span><\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1651\" data-end=\"1760\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">This forces the electricity sector to constantly maintain backup capacity, creating pressure on the system.<\/span><\/p>\n<h4 data-start=\"1762\" data-end=\"1814\"><span class=\"ez-toc-section\" id=\"3_Data_collection_and_energy_policy_planning\"><\/span><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">3. Data collection and energy policy planning<\/span><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p data-start=\"1815\" data-end=\"1889\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Registration provides the government with accurate statistics, enabling:<\/span><\/p>\n<ul data-start=\"1890\" data-end=\"2051\">\n<li data-start=\"1890\" data-end=\"1944\">\n<p data-start=\"1892\" data-end=\"1944\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Rational allocation of renewable energy resources.<\/span><\/p>\n<\/li>\n<li data-start=\"1945\" data-end=\"1993\">\n<p data-start=\"1947\" data-end=\"1993\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Environmental management and risk reduction.<\/span><\/p>\n<\/li>\n<li data-start=\"1994\" data-end=\"2051\">\n<p data-start=\"1996\" data-end=\"2051\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Long-term policy support for solar power development.<\/span><\/p>\n<\/li>\n<\/ul>\n<figure id=\"attachment_1499\" aria-describedby=\"caption-attachment-1499\" style=\"width: 1024px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1499 size-full\" src=\"https:\/\/cergy.vn\/wp-content\/uploads\/2025\/06\/he-thong-nang-luong-mat-troi-cergy.jpg\" alt=\"h\u1ec7 th\u1ed1ng n\u0103ng l\u01b0\u1ee3ng m\u1eb7t tr\u1eddi\" width=\"1024\" height=\"768\" srcset=\"https:\/\/cergy.vn\/wp-content\/uploads\/2025\/06\/he-thong-nang-luong-mat-troi-cergy.jpg 1024w, https:\/\/cergy.vn\/wp-content\/uploads\/2025\/06\/he-thong-nang-luong-mat-troi-cergy-300x225.jpg 300w, https:\/\/cergy.vn\/wp-content\/uploads\/2025\/06\/he-thong-nang-luong-mat-troi-cergy-768x576.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption id=\"caption-attachment-1499\" class=\"wp-caption-text\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">h\u1ec7 th\u1ed1ng n\u0103ng l\u01b0\u1ee3ng m\u1eb7t tr\u1eddi<\/span><\/figcaption><\/figure>\n<h3 data-start=\"2058\" data-end=\"2086\"><span class=\"ez-toc-section\" id=\"Community_perspectives\"><\/span><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Community perspectives<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"2087\" data-end=\"2195\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Many readers agree that registration is necessary but point out that current procedures remain cumbersome.<\/span><\/p>\n<p data-start=\"2197\" data-end=\"2309\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">According to <strong data-start=\"2210\" data-end=\"2228\">Decree 58\/2025<\/strong>, households installing rooftop solar systems for self-consumption must notify:<\/span><\/p>\n<ul data-start=\"2310\" data-end=\"2454\">\n<li data-start=\"2310\" data-end=\"2346\">\n<p data-start=\"2312\" data-end=\"2346\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Department of Industry and Trade<\/span><\/p>\n<\/li>\n<li data-start=\"2347\" data-end=\"2373\">\n<p data-start=\"2349\" data-end=\"2373\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Local electricity unit<\/span><\/p>\n<\/li>\n<li data-start=\"2374\" data-end=\"2411\">\n<p data-start=\"2376\" data-end=\"2411\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Construction management authority<\/span><\/p>\n<\/li>\n<li data-start=\"2412\" data-end=\"2454\">\n<p data-start=\"2414\" data-end=\"2454\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Fire prevention and fighting authority<\/span><\/p>\n<\/li>\n<\/ul>\n<p data-start=\"2456\" data-end=\"2614\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Some argue that only local electricity providers should act as a single contact point, then coordinate with other agencies to reduce the burden on citizens.<\/span><\/p>\n<h3 data-start=\"2621\" data-end=\"2655\"><span class=\"ez-toc-section\" id=\"Legal_gap_and_EVNs_proposal\"><\/span><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Legal gap and EVN\u2019s proposal<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"2656\" data-end=\"2994\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Under Decree 58\/2025 of the Government on renewable energy development, organizations, individuals, and households developing rooftop solar systems for self-consumption must notify the Department of Industry and Trade, electricity units, construction regulators, and fire prevention authorities for management, monitoring, and guidance.<\/span><\/p>\n<p data-start=\"2996\" data-end=\"3232\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">In practice, however, many households (especially families) have not taken the initiative to notify. In some cases, electricity units provided guidance, but households either did not cooperate or failed to submit proper documentation.<\/span><\/p>\n<p data-start=\"3234\" data-end=\"3361\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Currently, Decree 58 does not specify whether failing to notify constitutes a violation, leading to confusion in enforcement.<\/span><\/p>\n<p data-start=\"3363\" data-end=\"3416\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Therefore, EVN has proposed adding new regulations:<\/span><\/p>\n<ul data-start=\"3417\" data-end=\"3633\">\n<li data-start=\"3417\" data-end=\"3633\">\n<p data-start=\"3419\" data-end=\"3633\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Organizations and individuals who install rooftop solar systems for self-production and self-consumption without notification or registration will be subject to administrative penalties in the electricity sector.<\/span><\/p>\n<\/li>\n<\/ul>\n<p data-start=\"3635\" data-end=\"3801\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">This proposal aims to strengthen regulatory effectiveness, ensure grid safety, and at the same time encourage renewable energy development within a legal framework.<\/span><\/p>\n<h2 data-start=\"3424\" data-end=\"3448\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-1795 size-large\" src=\"https:\/\/cergy.vn\/wp-content\/uploads\/2025\/09\/Anh-man-hinh-2025-09-16-luc-09.04.25-1024x578.png\" alt=\"Nh\u00e0 ng\u01b0\u1eddi d\u00e2n l\u1eafp \u0111i\u1ec7n m\u1eb7t tr\u1eddi\" width=\"1024\" height=\"578\" srcset=\"https:\/\/cergy.vn\/wp-content\/uploads\/2025\/09\/Anh-man-hinh-2025-09-16-luc-09.04.25-1024x578.png 1024w, https:\/\/cergy.vn\/wp-content\/uploads\/2025\/09\/Anh-man-hinh-2025-09-16-luc-09.04.25-300x169.png 300w, https:\/\/cergy.vn\/wp-content\/uploads\/2025\/09\/Anh-man-hinh-2025-09-16-luc-09.04.25-768x433.png 768w, https:\/\/cergy.vn\/wp-content\/uploads\/2025\/09\/Anh-man-hinh-2025-09-16-luc-09.04.25-1536x867.png 1536w, https:\/\/cergy.vn\/wp-content\/uploads\/2025\/09\/Anh-man-hinh-2025-09-16-luc-09.04.25.png 2038w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/span><\/h2>\n<h3 data-start=\"3808\" data-end=\"3833\"><span class=\"ez-toc-section\" id=\"Cergys_perspective\"><\/span><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Cergy\u2019s perspective<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"3834\" data-end=\"4037\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">As a company in the solar energy sector, Cergy believes registration is a necessary step for sustainable system development. However, procedures should be streamlined and more transparent, for example:<\/span><\/p>\n<ul data-start=\"4038\" data-end=\"4261\">\n<li data-start=\"4038\" data-end=\"4114\">\n<p data-start=\"4040\" data-end=\"4114\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Only local electricity providers should serve as a single contact point.<\/span><\/p>\n<\/li>\n<li data-start=\"4115\" data-end=\"4178\">\n<p data-start=\"4117\" data-end=\"4178\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Digital platforms should allow citizens to register online.<\/span><\/p>\n<\/li>\n<li data-start=\"4179\" data-end=\"4261\">\n<p data-start=\"4181\" data-end=\"4261\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Clear, practical technical guidelines should be made available for households.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"4268\" data-end=\"4284\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Conclusion<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"4285\" data-end=\"4595\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">Registering rooftop solar self-consumption systems is essential for ensuring technical safety, managing grid loads, and supporting national energy policy. However, the process should be simplified to make it more convenient for citizens\u2014encouraging renewable energy development while ensuring safe operation.<\/span><\/p>\n<p data-start=\"4597\" data-end=\"4783\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">\ud83d\udc49 Cergy will continue to update the latest information on policies, regulations, and solar power solutions to accompany customers, partners, and the clean energy community in Vietnam.<\/span><\/p>\n<p data-start=\"4785\" data-end=\"4919\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">For detailed consultation, on-site surveys, or a quotation tailored to your needs and installation area, please contact us directly:<\/span><\/p>\n<p data-start=\"4921\" data-end=\"5083\"><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">\ud83d\udcde Technical Hotline: 0386 247 686<\/span><br data-start=\"4955\" data-end=\"4958\" \/><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">\ud83c\udf10 Website: <a class=\"decorated-link\" href=\"https:\/\/cergy.vn\/\" target=\"_new\" rel=\"noopener\" data-start=\"4970\" data-end=\"4986\">https:\/\/cergy.vn<\/a><\/span><br data-start=\"4986\" data-end=\"4989\" \/><span style=\"font-family: tahoma, arial, helvetica, sans-serif;\">\ud83d\udccd Cergy \u2013 Professional, efficient, and sustainable solar energy solutions for every project<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Why must rooftop solar systems for self-consumption be registered with EVN? As electricity costs continue to rise and the trend toward green energy grows stronger, investing in solar power systems has become a smart choice for households, businesses, and production facilities. Cergy explains why even rooftop solar systems designed for self-consumption still need to be registered with EVN. Learn the reasons, legal requirements, and insights from experts and the public. According to a new proposal from Vietnam Electricity (EVN), households and organizations that install rooftop solar systems for self-production and self-consumption but fail to register or notify the authorities may face administrative penalties. \u00a0 How to calculate solar system capacity Why is registration of rooftop solar self-consumption systems required? 1. Ensuring electrical safety and fire protection Notification helps EVN and regulators collect accurate data, provide technical guidance, and monitor installations. This reduces risks such as: Reverse current into the grid, causing system failures. Local overloads, potentially leading to fires or explosions. Systems that fail to meet safety standards. 2. Load management and grid balance A few households may not significantly impact the system. However, if millions of households install without registration, the national grid could face severe fluctuations: Sunny days: reduced grid demand \u2192 excess supply. Stormy or rainy days: households rely on the grid again \u2192 power shortages. This forces the electricity sector to constantly maintain backup capacity, creating pressure on the system. 3. Data collection and energy policy planning Registration provides the government with accurate statistics, enabling: Rational allocation of renewable energy resources. Environmental management and risk reduction. Long-term policy support for solar power development. Community perspectives Many readers agree that registration is necessary but point out that current procedures remain cumbersome. According to Decree 58\/2025, households installing rooftop solar systems for self-consumption must notify: Department of Industry<\/p>\n","protected":false},"author":2,"featured_media":1795,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[41,42],"tags":[78,76],"class_list":["post-1849","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-company-news","category-products","tag-he-thong-dien-mat-troi-en","tag-dien-mat-troi-en"],"acf":[],"_links":{"self":[{"href":"https:\/\/cergy.vn\/en\/wp-json\/wp\/v2\/posts\/1849","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cergy.vn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cergy.vn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cergy.vn\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/cergy.vn\/en\/wp-json\/wp\/v2\/comments?post=1849"}],"version-history":[{"count":2,"href":"https:\/\/cergy.vn\/en\/wp-json\/wp\/v2\/posts\/1849\/revisions"}],"predecessor-version":[{"id":1851,"href":"https:\/\/cergy.vn\/en\/wp-json\/wp\/v2\/posts\/1849\/revisions\/1851"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cergy.vn\/en\/wp-json\/wp\/v2\/media\/1795"}],"wp:attachment":[{"href":"https:\/\/cergy.vn\/en\/wp-json\/wp\/v2\/media?parent=1849"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cergy.vn\/en\/wp-json\/wp\/v2\/categories?post=1849"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cergy.vn\/en\/wp-json\/wp\/v2\/tags?post=1849"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}