{"id":88791,"date":"2026-09-04T12:54:10","date_gmt":"2026-09-04T10:54:10","guid":{"rendered":"https:\/\/energyear.com\/?p=88791"},"modified":"2026-09-04T13:17:28","modified_gmt":"2026-09-04T11:17:28","slug":"net-metering-medicion-neta-energia-solar","status":"publish","type":"post","link":"https:\/\/energyear.com\/pt\/diccionario-energetico\/net-metering-medicion-neta-energia-solar\/","title":{"rendered":"Net Metering: o que \u00e9 e como funciona a medi\u00e7\u00e3o l\u00edquida de energia"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"88791\" class=\"elementor elementor-88791\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cd7ed7e e-con-full e-flex e-con e-parent\" data-id=\"cd7ed7e\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t<div class=\"elementor-element elementor-element-5022b9f e-con-full e-flex e-con e-child\" data-id=\"5022b9f\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a80ec7d elementor-widget elementor-widget-heading\" data-id=\"a80ec7d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Net Metering: o que \u00e9 e como funciona a medi\u00e7\u00e3o l\u00edquida de energia<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ebe8bf9 elementor-widget elementor-widget-text-editor\" data-id=\"ebe8bf9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>O net metering, conhecido em espanhol como \u00abmedici\u00f3n neta\u00bb ou \u00abbalance neto\u00bb, \u00e9 um mecanismo de compensa\u00e7\u00e3o utilizado em instala\u00e7\u00f5es de produ\u00e7\u00e3o distribu\u00edda que permite contabilizar a eletricidade consumida da rede e a energia excedente que o utilizador injeta no sistema el\u00e9trico.<\/p><p>O net metering est\u00e1 especialmente relacionado com o autoconsumo de energia solar fotovoltaica. Quando uma instala\u00e7\u00e3o produz mais eletricidade do que a necess\u00e1ria num determinado momento, o excedente pode ser injetado na rede. Posteriormente, a energia previamente injetada pode ser utilizada, total ou parcialmente, para compensar a eletricidade consumida da rede, de acordo com as regras estabelecidas por cada mercado.<\/p><p>Por conseguinte, o net metering n\u00e3o \u00e9 uma tecnologia fotovoltaica nem um sistema de armazenamento. Trata-se de um mecanismo de medi\u00e7\u00e3o e compensa\u00e7\u00e3o que regula a forma como s\u00e3o contabilizadas as trocas de eletricidade entre um autoconsumidor e a rede.<\/p><p>Na Europa, n\u00e3o existe um regime \u00fanico de net metering aplic\u00e1vel a todos os pa\u00edses. A legisla\u00e7\u00e3o europeia reconhece o direito dos autoconsumidores de energias renov\u00e1veis de produzir, armazenar e vender o seu excedente de eletricidade, mas cada Estado-Membro desenvolve posteriormente os seus pr\u00f3prios mecanismos de remunera\u00e7\u00e3o, compensa\u00e7\u00e3o e acesso \u00e0 rede.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-8e887f1 e-con-full e-flex e-con e-child\" data-id=\"8e887f1\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-47a1915 e-con-full e-flex e-con e-parent\" data-id=\"47a1915\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ce8f8da elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"ce8f8da\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Como funciona o Net Metering?<\/h2><p>O funcionamento do net metering baseia-se no registo dos fluxos de eletricidade que ocorrem entre uma instala\u00e7\u00e3o de autoconsumo e a rede el\u00e9trica. Durante as horas em que a produ\u00e7\u00e3o solar \u00e9 inferior ao consumo, o utilizador recorre primeiro \u00e0 eletricidade produzida pela sua instala\u00e7\u00e3o fotovoltaica e obt\u00e9m da rede a energia adicional de que necessita. Quando a produ\u00e7\u00e3o excede a procura instant\u00e2nea, a eletricidade excedente transforma-se num excedente que pode ser injetado na rede el\u00e9trica. O processo pode ser representado de forma simplificada da seguinte maneira:<\/p><p style=\"text-align: center;\"><strong>Produ\u00e7\u00e3o de energia solar \u2192 autoconsumo \u2192 excedentes \u2192 inje\u00e7\u00e3o na rede \u2192 compensa\u00e7\u00e3o<\/strong><\/p><p>Para registar estas trocas, utiliza-se normalmente um contador capaz de distinguir a energia importada da energia exportada. No final do per\u00edodo de liquida\u00e7\u00e3o, o mecanismo de net metering determina que parte da eletricidade injetada pode compensar o consumo efetuado a partir da rede.<\/p><ul><li>Produ\u00e7\u00e3o inferior ao consumo: a instala\u00e7\u00e3o importa eletricidade da rede para cobrir a procura restante.<\/li><li>Gera\u00e7\u00e3o equivalente ao consumo: a produ\u00e7\u00e3o fotovoltaica cobre praticamente toda a procura instant\u00e2nea.<\/li><li>Produ\u00e7\u00e3o superior ao consumo: a eletricidade excedente \u00e9 exportada para a rede e contabilizada de acordo com as condi\u00e7\u00f5es do sistema de net metering.<\/li><\/ul><p>A <span style=\"text-decoration: underline;\"><span style=\"color: #000080;\"><a style=\"color: #000080; text-decoration: underline;\" href=\"https:\/\/eur-lex.europa.eu\/legal-content\/ES\/TXT\/?qid=1780066433895&amp;uri=CELEX%3A02018L2001-20240716&amp;\" target=\"_blank\" rel=\"noopener noreferrer\">Diretiva europeia relativa \u00e0s energias renov\u00e1veis<\/a><\/span><\/span> reconhece o direito dos autoconsumidores de produzirem eletricidade renov\u00e1vel para consumo pr\u00f3prio, armazen\u00e1-la e vender os excedentes que injetam na rede. Estabelece ainda que a remunera\u00e7\u00e3o dessa eletricidade deve refletir o seu valor de mercado e pode ter em conta o seu valor para a rede, o ambiente e a sociedade.<\/p><h2>Net Metering e autoconsumo fotovoltaico<\/h2><p>O net metering permite aumentar o aproveitamento econ\u00f3mico de uma instala\u00e7\u00e3o fotovoltaica quando existe uma diferen\u00e7a temporal entre o momento em que a eletricidade \u00e9 gerada e o momento em que \u00e9 consumida. Uma habita\u00e7\u00e3o, um com\u00e9rcio ou uma pequena instala\u00e7\u00e3o industrial pode produzir uma quantidade elevada de eletricidade durante as horas centrais do dia. Se, nesse momento, o consumo for inferior \u00e0 produ\u00e7\u00e3o fotovoltaica, surge um excedente que pode ser exportado para a rede.<\/p><p>\u00c0 noite ou durante per\u00edodos de baixa irradi\u00e2ncia, a situa\u00e7\u00e3o inverte-se: a instala\u00e7\u00e3o produz pouca ou nenhuma eletricidade e o consumidor precisa de obter energia da rede el\u00e9trica. Em determinados modelos de net metering, a energia exportada anteriormente permite compensar uma parte dessa eletricidade importada. O per\u00edodo utilizado para efetuar o balan\u00e7o pode ser hor\u00e1rio, mensal, anual ou seguir outros crit\u00e9rios definidos pela regulamenta\u00e7\u00e3o nacional.<\/p><p>O <span style=\"text-decoration: underline;\"><span style=\"color: #000080;\"><a style=\"color: #000080; text-decoration: underline;\" href=\"https:\/\/www.ceer.eu\/publication\/regulatory-and-consumer-considerations-for-decentralised-energy-opportunities\/\" target=\"_blank\" rel=\"noopener noreferrer\">Council of European Energy Regulators (CEER)<\/a><\/span><\/span> identifica o net metering como um dos poss\u00edveis sistemas de fatura\u00e7\u00e3o utilizados quando um autoconsumidor injeta o excedente de eletricidade na rede, a par de outros modelos de medi\u00e7\u00e3o e remunera\u00e7\u00e3o. Do ponto de vista energ\u00e9tico, o net metering facilita a participa\u00e7\u00e3o ativa do consumidor no sistema el\u00e9trico. O utilizador deixa de ser apenas um comprador de eletricidade e passa a atuar tamb\u00e9m como produtor, uma figura habitualmente designada por <em>prosumer<\/em> ou prosumidor.<\/p><p>No entanto, a tend\u00eancia regulat\u00f3ria europeia tem vindo a dar cada vez mais aten\u00e7\u00e3o ao autoconsumo instant\u00e2neo, aos sinais de pre\u00e7o, ao armazenamento e \u00e0 flexibilidade. Isto deve-se ao facto de uma compensa\u00e7\u00e3o total da energia importada e exportada poder n\u00e3o refletir corretamente o momento em que a eletricidade \u00e9 produzida, nem os custos decorrentes da utiliza\u00e7\u00e3o da rede.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0191138 elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"0191138\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1672\" height=\"941\" src=\"https:\/\/energyear.com\/wp-content\/uploads\/2026\/09\/how-net-metering-works-solar-self-consumption-energyear.webp\" class=\"attachment-full size-full wp-image-88794\" alt=\"Infogr\u00e1fico que mostra como funciona a medi\u00e7\u00e3o l\u00edquida no contexto da produ\u00e7\u00e3o de energia solar, do autoconsumo, das exporta\u00e7\u00f5es para a rede e das importa\u00e7\u00f5es de eletricidade\" srcset=\"https:\/\/energyear.com\/wp-content\/uploads\/2026\/09\/how-net-metering-works-solar-self-consumption-energyear.webp 1672w, https:\/\/energyear.com\/wp-content\/uploads\/2026\/09\/how-net-metering-works-solar-self-consumption-energyear-300x169.webp 300w, https:\/\/energyear.com\/wp-content\/uploads\/2026\/09\/how-net-metering-works-solar-self-consumption-energyear-1024x576.webp 1024w, https:\/\/energyear.com\/wp-content\/uploads\/2026\/09\/how-net-metering-works-solar-self-consumption-energyear-768x432.webp 768w, https:\/\/energyear.com\/wp-content\/uploads\/2026\/09\/how-net-metering-works-solar-self-consumption-energyear-1536x864.webp 1536w, https:\/\/energyear.com\/wp-content\/uploads\/2026\/09\/how-net-metering-works-solar-self-consumption-energyear-600x338.webp 600w\" sizes=\"auto, (max-width: 1672px) 100vw, 1672px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">O net metering permite compensar parte da eletricidade consumida da rede com os excedentes de energia solar anteriormente exportados.<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-78f9a37 elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"78f9a37\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Diferen\u00e7a entre \u00abNet Metering\u00bb e \u00abNet Billing\u00bb<\/h2><p>O \u00abnet metering\u00bb e o \u00abnet billing\u00bb est\u00e3o relacionados com a compensa\u00e7\u00e3o de excedentes de energia renov\u00e1vel, mas representam mecanismos diferentes. Num esquema cl\u00e1ssico de \u00abnet metering\u00bb, a compensa\u00e7\u00e3o \u00e9 efetuada principalmente com base nas quantidades de energia. Os quilowatts-hora exportados s\u00e3o utilizados para reduzir, de acordo com as condi\u00e7\u00f5es estabelecidas, os quilowatts-hora importados durante o per\u00edodo de liquida\u00e7\u00e3o. No \u00abnet billing\u00bb, pelo contr\u00e1rio, a energia comprada \u00e0 rede e a eletricidade exportada s\u00e3o avaliadas economicamente de forma separada. O consumidor paga um determinado pre\u00e7o pela eletricidade importada e recebe uma remunera\u00e7\u00e3o ou cr\u00e9dito pelos excedentes enviados para a rede.<\/p><ul><li>Net Metering: relaciona principalmente os kWh importados com os kWh anteriormente exportados.<\/li><li>Fatura\u00e7\u00e3o l\u00edquida: atribui um valor econ\u00f3mico independente \u00e0 eletricidade consumida e \u00e0 eletricidade injetada na rede.<\/li><\/ul><p>Esta diferen\u00e7a \u00e9 importante porque um kWh produzido ao meio-dia n\u00e3o tem necessariamente o mesmo valor para o sistema el\u00e9trico que um kWh consumido durante uma hora de pico de procura. Por esta raz\u00e3o, v\u00e1rios mercados europeus evolu\u00edram ou est\u00e3o a evoluir de esquemas tradicionais de net metering para modelos que valorizam economicamente os excedentes e fornecem sinais mais diretos para incentivar o autoconsumo e a flexibilidade.<\/p><p>Um exemplo s\u00e3o os Pa\u00edses Baixos. A <span style=\"text-decoration: underline; color: #000080;\"><a style=\"color: #000080; text-decoration: underline;\" href=\"https:\/\/www.iea.org\/policies\/31704-solar-pv-net-metering-and-feed-in-remuneration-for-small-consumers?\" target=\"_blank\" rel=\"noopener noreferrer\">Ag\u00eancia Internacional da Energia (AIE)<\/a><\/span> refere que o sistema neerland\u00eas permite atualmente que as fam\u00edlias e as pequenas empresas compensem a eletricidade fotovoltaica exportada com a eletricidade consumida da rede, mas este regime de compensa\u00e7\u00e3o l\u00edquida terminar\u00e1 a 31 de dezembro de 2026. A partir de 2027, a eletricidade exportada continuar\u00e1 a ser remunerada, mas deixar\u00e1 de ser compensada diretamente com o consumo.<\/p><h2>Por que raz\u00e3o \u00e9 importante o \u00abNet Metering\u00bb para as energias renov\u00e1veis?<\/h2><p>O net metering tem desempenhado um papel relevante na expans\u00e3o da produ\u00e7\u00e3o renov\u00e1vel distribu\u00edda, pois permite atribuir valor econ\u00f3mico \u00e0 eletricidade que uma instala\u00e7\u00e3o produz, mas n\u00e3o consome de forma imediata. No caso de uma instala\u00e7\u00e3o solar fotovoltaica, isto pode melhorar o aproveitamento dos excedentes e reduzir a quantidade l\u00edquida de eletricidade faturada ao consumidor. Consequentemente, este mecanismo pode melhorar a viabilidade econ\u00f3mica do autoconsumo e reduzir o per\u00edodo de recupera\u00e7\u00e3o de determinados investimentos. Entre as suas principais implica\u00e7\u00f5es encontram-se:<\/p><ul><li>Aproveitamento dos excedentes: a eletricidade solar que n\u00e3o \u00e9 consumida imediatamente pode ter valor no \u00e2mbito do mecanismo de compensa\u00e7\u00e3o.<\/li><li>Redu\u00e7\u00e3o do consumo l\u00edquido: os excedentes podem compensar parte da eletricidade posteriormente obtida da rede.<\/li><li>Impulso \u00e0 produ\u00e7\u00e3o distribu\u00edda: facilita a participa\u00e7\u00e3o das fam\u00edlias e das empresas na produ\u00e7\u00e3o de eletricidade renov\u00e1vel.<\/li><li>Participa\u00e7\u00e3o ativa do consumidor: transforma o utilizador num agente capaz tanto de consumir como de produzir e injetar eletricidade.<\/li><\/ul><p>Do ponto de vista do sistema el\u00e9trico, a conce\u00e7\u00e3o do net metering deve tamb\u00e9m ter em conta quest\u00f5es como as tarifas de rede, o custo das infraestruturas, a congest\u00e3o, os sinais hor\u00e1rios de pre\u00e7o e a necessidade de adaptar o consumo aos momentos de maior produ\u00e7\u00e3o renov\u00e1vel. Por isso, o quadro europeu est\u00e1 a evoluir no sentido de sistemas em que o autoconsumidor n\u00e3o s\u00f3 gera e exporta eletricidade, como tamb\u00e9m pode utilizar sistemas de armazenamento, adaptar a sua procura, participar atrav\u00e9s de agregadores e responder aos sinais do mercado.<\/p><p>O net metering deve, portanto, ser entendido como um dos diversos mecanismos poss\u00edveis para contabilizar e compensar a eletricidade proveniente do autoconsumo de energia renov\u00e1vel. A sua aplica\u00e7\u00e3o concreta depende sempre do quadro regulamentar de cada pa\u00eds e n\u00e3o deve ser confundido com outros modelos, como o net billing, a venda direta de excedentes ou os sistemas de tarifa de inje\u00e7\u00e3o.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-36892e9 elementor-widget__width-initial elementor-widget elementor-widget-post-info\" data-id=\"36892e9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"post-info.default\">\n\t\t\t\t\t\t\t<ul class=\"elementor-inline-items elementor-icon-list-items elementor-post-info\">\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-repeater-item-5e5f915 elementor-inline-item\" itemprop=\"about\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-tags\"><\/i>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text elementor-post-info__item elementor-post-info__item--type-terms\">\n\t\t\t\t\t\t\t<span class=\"elementor-post-info__item-prefix\">Tags:<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-post-info__terms-list\">\n\t\t\t\t<a href=\"https:\/\/energyear.com\/pt\/tag\/autoconsumo-fotovoltaico\/\" class=\"elementor-post-info__terms-list-item\">autoconsumo fotovoltaico<\/a>, <a href=\"https:\/\/energyear.com\/pt\/tag\/balance-neto\/\" class=\"elementor-post-info__terms-list-item\">saldo l\u00edquido<\/a>, <a href=\"https:\/\/energyear.com\/pt\/tag\/energia-solar-fotovoltaica\/\" class=\"elementor-post-info__terms-list-item\">energia solar fotovoltaica<\/a>, <a href=\"https:\/\/energyear.com\/pt\/tag\/excedentes-fotovoltaicos\/\" class=\"elementor-post-info__terms-list-item\">excedentes fotovoltaicos<\/a>, <a href=\"https:\/\/energyear.com\/pt\/tag\/generacion-distribuida\/\" class=\"elementor-post-info__terms-list-item\">gera\u00e7\u00e3o distribu\u00edda<\/a>, <a href=\"https:\/\/energyear.com\/pt\/tag\/medicion-neta\/\" class=\"elementor-post-info__terms-list-item\">medi\u00e7\u00e3o l\u00edquida<\/a>, <a href=\"https:\/\/energyear.com\/pt\/tag\/net-billing\/\" class=\"elementor-post-info__terms-list-item\">Net Billing<\/a>, <a href=\"https:\/\/energyear.com\/pt\/tag\/net-metering\/\" class=\"elementor-post-info__terms-list-item\">Net Metering<\/a>, <a href=\"https:\/\/energyear.com\/pt\/tag\/rendimiento-fotovoltaico\/\" class=\"elementor-post-info__terms-list-item\">rendimento fotovoltaico<\/a>\t\t\t\t<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>O net metering \u00e9 um sistema de compensa\u00e7\u00e3o que permite contabilizar a energia consumida da rede e o excedente de eletricidade renov\u00e1vel que uma instala\u00e7\u00e3o injeta na mesma. \u00c9 um mecanismo fundamental para o autoconsumo e a produ\u00e7\u00e3o distribu\u00edda.<\/p>","protected":false},"author":14,"featured_media":88792,"comment_status":"closed","ping_status":"open","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[178],"tags":[226,272,192,273,274,271,275,270,251],"class_list":["post-88791","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-diccionario-energetico","tag-autoconsumo-fotovoltaico","tag-balance-neto","tag-energia-solar-fotovoltaica","tag-excedentes-fotovoltaicos","tag-generacion-distribuida","tag-medicion-neta","tag-net-billing","tag-net-metering","tag-rendimiento-fotovoltaico"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - 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