{"id":7129,"date":"2022-06-22T09:22:45","date_gmt":"2022-06-22T07:22:45","guid":{"rendered":"https:\/\/sceaux-lagazette.fr\/?p=7129"},"modified":"2022-06-22T09:22:46","modified_gmt":"2022-06-22T07:22:46","slug":"reseau-centralise-ou-local","status":"publish","type":"post","link":"https:\/\/sceaux-lagazette.fr\/index.php\/2022\/06\/22\/reseau-centralise-ou-local\/","title":{"rendered":"R\u00e9seau centralis\u00e9 ou local ?"},"content":{"rendered":"\n<p>Lors d\u2019une conf\u00e9rence r\u00e9cemment organis\u00e9e par la mairie de Sceaux, un<a href=\"https:\/\/fr.wikipedia.org\/wiki\/Christian_de_Perthuis\" target=\"_blank\" rel=\"noreferrer noopener\"> \u00e9conomiste <\/a>a priori s\u00e9rieux reprenait l\u2019id\u00e9e que les renouvelables permettent de sortir du syst\u00e8me \u00e9lectrique centralis\u00e9 d\u00fb au nucl\u00e9aire. C\u2019est en r\u00e9alit\u00e9 un mythe propag\u00e9 par des personnes qui ne connaissent pas le fonctionnement d\u2019un r\u00e9seau \u00e9lectrique et les caract\u00e9ristiques des \u00e9nergies renouvelables. En comprendre les tenants et les aboutissants est n\u00e9cessaire au d\u00e9bat citoyen, \u00e0 Sceaux comme ailleurs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Fonctionnement actuel<\/h2>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignright size-large\"><img decoding=\"async\" width=\"405\" height=\"244\" src=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/06\/Consommation-\u00e9lectrique-2019.png\" alt=\"\" class=\"wp-image-7130\" srcset=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/06\/Consommation-\u00e9lectrique-2019.png 405w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/06\/Consommation-\u00e9lectrique-2019-300x181.png 300w\" sizes=\"(max-width: 405px) 100vw, 405px\" \/><\/figure><\/div>\n\n\n\n<p>La consommation, c\u2019est-\u00e0-dire la demande), varie en permanence&nbsp;: d\u2019abord selon la saison et les heures de la journ\u00e9e (voir graphique ci-contre). Puis pour de nombreuses autres causes&nbsp;: impact de la m\u00e9t\u00e9o, des week-ends \u2026 Sur un an, le ratio entre minimum et maximum est de 1 \u00e0 3. Il faut garder en m\u00e9moire cette multiplication par 3 de la consommation&nbsp;; elle est un \u00e9l\u00e9ment cl\u00e9 de la compr\u00e9hension du probl\u00e8me.<\/p>\n\n\n\n<p>Les principaux moyens utilis\u00e9s pour r\u00e9pondre \u00e0 cette variabilit\u00e9 sont\u00a0: la planification des arr\u00eats de centrales nucl\u00e9aires, la modulation de l\u2019appel \u00e0 l\u2019\u00e9nergie hydraulique, le pompage dans les STEP(<a href=\"https:\/\/www.connaissancedesenergies.org\/fiche-pedagogique\/hydroelectricite-stations-de-transfert-denergie-par-pompage-step\" target=\"_blank\" rel=\"noreferrer noopener\">station de transfert d\u2019\u00e9nergie par pompage<\/a>), l\u2019utilisation des \u00e9nergies fossiles (gaz et un peu charbon)<\/p>\n\n\n\n<p>Les \u00e9changes internationaux sont un facteur important de la r\u00e9ponse \u00e0 la variabilit\u00e9 de la demande. Ils repr\u00e9sentent souvent plus de 10% de la production. Ils se traduisent par de l\u2019export lorsque la France consomme moins, par de l\u2019import en cas de manque. De sorte que, nucl\u00e9aire ou pas, l\u2019existence d\u2019un r\u00e9seau de grand transport est indispensable. D\u2019ailleurs RTE n\u2019a cess\u00e9 d\u2019augmenter ses capacit\u00e9s d\u2019\u00e9changes avec les pays voisins.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Agir localement<\/h2>\n\n\n\n<p>Certains pr\u00e9tendent que les \u00e9nergies renouvelables permettront un approvisionnement local, avec des outils de production de petites tailles, adapt\u00e9es aux besoins locaux.<\/p>\n\n\n\n<p>Mais qu\u2019on agisse localement ou nationalement, la question de l\u2019ajustement de l\u2019offre \u00e0 la demande se pose toujours&nbsp;: comment dimensionner une installation&nbsp;? Sur le besoin moyen ou sur le besoin maximal&nbsp;? Dans le premier cas comment fait-on quand le besoin est sup\u00e9rieur \u00e0 la demande&nbsp;? Faut-il un back-up en cas de panne ou pour les quasiment in\u00e9vitables op\u00e9rations de maintenance&nbsp;? Dans le deuxi\u00e8me cas, que fait-on de la production exc\u00e9dentaire&nbsp;?<\/p>\n\n\n\n<p>Le probl\u00e8me majeur des renouvelables est que leur production est par nature variable, et que cette variabilit\u00e9 ne d\u00e9pend pas de l\u2019exploitant, au contraire des autres \u00e9nergies que l\u2019on qualifie pour cela de \u00ab&nbsp;pilotables&nbsp;\u00bb. Examinons successivement le cas du solaire et de l\u2019\u00e9olien.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Production photovolta\u00efque<\/h2>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignright size-large\"><img decoding=\"async\" width=\"385\" height=\"231\" src=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/06\/Production-photovoltaique-2019.png\" alt=\"\" class=\"wp-image-7131\" srcset=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/06\/Production-photovoltaique-2019.png 385w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/06\/Production-photovoltaique-2019-300x180.png 300w\" sizes=\"(max-width: 385px) 100vw, 385px\" \/><\/figure><\/div>\n\n\n\n<p>On ne sera pas surpris d\u2019observer la saisonnalit\u00e9 de cette production (plus accentu\u00e9e \u00e0 10h qu\u2019\u00e0 13h\u00a0: \u00e0 10h le soleil est lev\u00e9 depuis longtemps en \u00e9t\u00e9 mais pas en hiver) et la forte variation journali\u00e8re (rappelons que la nuit la production est nulle). A une heure et un mois donn\u00e9s, on observe aussi une assez importante variation, mais moins importante que celle entre jours pluvieux et jours ensoleill\u00e9s. Il se trouve qu\u2019 en France, le cas le plus fr\u00e9quent est celui de r\u00e9gions ensoleill\u00e9es pendant que d\u2019autres vivent un temps couvert voire pluvieux. Ainsi, les variations locales sont en partie gomm\u00e9es par l\u2019approche nationale.<\/p>\n\n\n\n<p>On peut compenser la variation journali\u00e8re par du stockage ou par l\u2019appel \u00e0 d\u2019autres sources de production. Mais pour faire face aux al\u00e9as m\u00e9t\u00e9o, il faut compter sur les compensations nationales et entre \u00e9nergies. Par ailleurs, la production photovolta\u00efque est contracyclique de la saisonnalit\u00e9 de la demande. Quand le soleil brille, on a moins besoin d\u2019\u00e9nergie. Et le nombre d\u2019heures d\u2019ensoleillement n\u2019est pas homog\u00e8ne en France <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Production \u00e9olienne<\/h2>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignright size-large\"><img decoding=\"async\" width=\"388\" height=\"234\" src=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/06\/Production-\u00e9olienne-2019.png\" alt=\"\" class=\"wp-image-7132\" srcset=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/06\/Production-\u00e9olienne-2019.png 388w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/06\/Production-\u00e9olienne-2019-300x181.png 300w\" sizes=\"(max-width: 388px) 100vw, 388px\" \/><\/figure><\/div>\n\n\n\n<p>On observe que, pendant 10 % du temps, la production des \u00e9oliennes est inf\u00e9rieure \u00e0 5% de la puissance install\u00e9e , et que la moiti\u00e9 du temps elle est \u00e0 moins de 18 % du maximum observ\u00e9.<\/p>\n\n\n\n<p>L\u2019\u00e9olien a l\u2019avantage d\u2019avoir une production plus forte l\u2019hiver que l\u2019\u00e9t\u00e9. Reste que sa production est tr\u00e8s al\u00e9atoire, avec des p\u00e9riodes sans vent qui peuvent \u00eatre assez longues (plusieurs semaines) et co\u00efncider avec des p\u00e9riodes de grand froid.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignright size-large\"><img decoding=\"async\" width=\"373\" height=\"254\" src=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/06\/Puissance-\u00e9olienne-2019.png\" alt=\"\" class=\"wp-image-7134\" srcset=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/06\/Puissance-\u00e9olienne-2019.png 373w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/06\/Puissance-\u00e9olienne-2019-300x204.png 300w\" sizes=\"(max-width: 373px) 100vw, 373px\" \/><\/figure><\/div>\n\n\n\n<p>De plus, l\u2019\u00e9olien est install\u00e9 loin des villes et dans les r\u00e9gions \u00e0 la fois isol\u00e9es et venteuses\u00a0: la r\u00e9partition g\u00e9ographique n\u2019est pas du tout \u00e9quilibr\u00e9e (voir graphique ci-contre). Le d\u00e9veloppement de grands parcs \u00e9oliens offshore ne pourra qu\u2019augmenter cette situation : dans le sc\u00e9nario 2050 \u00ab\u00a0100% renouvelables\u00a0\u00bb, l\u2019\u00e9olien en mer repr\u00e9senterait 45% de la puissance \u00e9olienne install\u00e9e et sans doute plus de la moiti\u00e9 de la production \u00e9olienne.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Les \u00e9tudes RTE pour 2050.<\/h2>\n\n\n\n<p>Dans <a href=\"https:\/\/assets.rte-france.com\/prod\/public\/2022-03\/BP50_Principaux%20re%CC%81sultats_fev2022_Chap10_reseaux.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">une \u00e9tude<\/a> parue en octobre 2021 sur les perspectives \u00e9lectriques \u00e0 l\u2019horizon 2050, <a href=\"https:\/\/www.rte-france.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">RTE<\/a> a \u00e9tudi\u00e9e six sc\u00e9narios. M0 est sans nucl\u00e9aire, M1 et M23 avec du nucl\u00e9aire actuel, N1, N2 et N3 avec plus ou moins de nouveaux EPR.<\/p>\n\n\n\n<p>Dans tous les cas, le r\u00e9seau d\u2019\u00e9changes internationaux est renforc\u00e9&nbsp;: la capacit\u00e9 est tripl\u00e9e.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignright size-large\"><img decoding=\"async\" width=\"361\" height=\"170\" src=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/06\/Investissements-RTE-2050.png\" alt=\"\" class=\"wp-image-7133\" srcset=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/06\/Investissements-RTE-2050.png 361w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/06\/Investissements-RTE-2050-300x141.png 300w\" sizes=\"(max-width: 361px) 100vw, 361px\" \/><\/figure><\/div>\n\n\n\n<p>Il faut aussi renforcer le r\u00e9seau national, et le co\u00fbt augmente quand on r\u00e9duit la part du nucl\u00e9aire. Il faut en fait renforcer tous les r\u00e9seaux pour faire face \u00e0 une variabilit\u00e9 augment\u00e9e. C\u2019est pourquoi de gros investissements sont pr\u00e9vus.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignright size-large\"><img decoding=\"async\" width=\"397\" height=\"239\" src=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/06\/MIX-M0-2050.png\" alt=\"\" class=\"wp-image-7135\" srcset=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/06\/MIX-M0-2050.png 397w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/06\/MIX-M0-2050-300x181.png 300w\" sizes=\"(max-width: 397px) 100vw, 397px\" \/><\/figure><\/div>\n\n\n\n<p>Il faut ajouter les co\u00fbts de distribution. Rappelons qu\u2019une partie de la production des EnR se fait directement sur le r\u00e9seau de distribution (le plus local) qui doit donc \u00eatre renforc\u00e9. Le faible taux de production des EnR une grande partie du temps oblige \u00e0 augmenter fortement les capacit\u00e9s de production comme on le voit dans le sch\u00e9ma ci-contre avec le sc\u00e9nario M0 (100 % renouvelables). Et qui dit augmentation des capacit\u00e9s, dit n\u00e9cessit\u00e9 de les raccorder.<\/p>\n\n\n\n<p>Donc, non le 100 % renouvelables (d\u00e9j\u00e0 nettement le plus cher) ne permet pas l\u2019autonomie locale, o\u00f9 seulement \u00e0 des co\u00fbts tellement prohibitifs qu\u2019ils n\u2019ont pas \u00e9t\u00e9 envisag\u00e9s par RTE.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Lors d\u2019une conf\u00e9rence r\u00e9cemment organis\u00e9e par la mairie de Sceaux, un \u00e9conomiste a priori s\u00e9rieux reprenait l\u2019id\u00e9e que les renouvelables permettent de sortir du syst\u00e8me \u00e9lectrique centralis\u00e9 d\u00fb au nucl\u00e9aire. C\u2019est en r\u00e9alit\u00e9 un mythe propag\u00e9 par des personnes qui ne connaissent pas le fonctionnement d\u2019un r\u00e9seau \u00e9lectrique et les&#8230;<\/p>\n","protected":false},"author":11,"featured_media":7134,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[53],"tags":[],"class_list":["post-7129","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-analyses","entry","simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>R\u00e9seau centralis\u00e9 ou local ? - La Gazette<\/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:\/\/sceaux-lagazette.fr\/index.php\/2022\/06\/22\/reseau-centralise-ou-local\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"R\u00e9seau centralis\u00e9 ou local ? - La Gazette\" \/>\n<meta property=\"og:description\" content=\"Lors d\u2019une conf\u00e9rence r\u00e9cemment organis\u00e9e par la mairie de Sceaux, un \u00e9conomiste a priori s\u00e9rieux reprenait l\u2019id\u00e9e que les renouvelables permettent de sortir du syst\u00e8me \u00e9lectrique centralis\u00e9 d\u00fb au nucl\u00e9aire. 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