{"id":9082,"date":"2024-07-29T15:07:43","date_gmt":"2024-07-29T13:07:43","guid":{"rendered":"https:\/\/be-storaged.de\/secondary-control-reserve-srl\/"},"modified":"2026-10-19T16:49:39","modified_gmt":"2026-10-19T14:49:39","slug":"secondary-control-reserve-srl","status":"publish","type":"post","link":"https:\/\/be-storaged.de\/en\/wiki\/q-r-s-t\/secondary-control-reserve-srl\/","title":{"rendered":"Secondary Control Reserve (SRL)"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Secondary control power (SCP)<\/strong> is an important component of control power in the power grid that helps balance medium-term imbalances between electricity generation and consumption and maintain grid stability.  <\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_89 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/be-storaged.de\/en\/wiki\/q-r-s-t\/secondary-control-reserve-srl\/#Second-line-of-defense-after-the-primary-reserve\" >Second line of defense after the primary reserve<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/be-storaged.de\/en\/wiki\/q-r-s-t\/secondary-control-reserve-srl\/#Pumped-storage-plants-gas-turbines-and-virtual-power-plants\" >Pumped-storage plants, gas turbines, and virtual power plants<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/be-storaged.de\/en\/wiki\/q-r-s-t\/secondary-control-reserve-srl\/#Registration-and-Access-Through-the-Transmission-System-Operators\" >Registration and Access Through the Transmission System Operators<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/be-storaged.de\/en\/wiki\/q-r-s-t\/secondary-control-reserve-srl\/#Compensation-for-Availability-and-Actual-Usage\" >Compensation for Availability and Actual Usage<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/be-storaged.de\/en\/wiki\/q-r-s-t\/secondary-control-reserve-srl\/#Faster-than-TRL-slower-than-PRL\" >Faster than TRL, slower than PRL<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/be-storaged.de\/en\/wiki\/q-r-s-t\/secondary-control-reserve-srl\/#Conclusion-Central-second-line-of-defense\" >Conclusion: Central second line of defense<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/be-storaged.de\/en\/wiki\/q-r-s-t\/secondary-control-reserve-srl\/#Frequently-Asked-Questions-FAQ\" >Frequently Asked Questions (FAQ)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/be-storaged.de\/en\/wiki\/q-r-s-t\/secondary-control-reserve-srl\/#What-is-secondary-control-power-SRL\" >What is secondary control power (SRL)?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/be-storaged.de\/en\/wiki\/q-r-s-t\/secondary-control-reserve-srl\/#How-quickly-does-SRL-respond-to-grid-fluctuations\" >How quickly does SRL respond to grid fluctuations?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/be-storaged.de\/en\/wiki\/q-r-s-t\/secondary-control-reserve-srl\/#Who-can-provide-SRL\" >Who can provide SRL?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Second-line-of-defense-after-the-primary-reserve\"><\/span>Second line of defense after the primary reserve<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<p class=\"wp-block-paragraph\">Second <strong>ary control power responds more slowly<\/strong> than <a title=\"Primary reserve\" href=\"https:\/\/be-storaged.de\/en\/wiki\/m-n-o-p\/primary-control-reserve-prl\/\"><u>primary reserve<\/u><\/a>, but faster than the <a title=\"Tertiary reserve\" href=\"https:\/\/be-storaged.de\/en\/wiki\/q-r-s-t\/tertiary-control-power-trl\/\"><u>tertiary reserve<\/u><\/a>to fluctuations in the power grid. It is needed to compensate for medium-term imbalances between power generation and consumption and to stabilize the grid frequency. Typical applications include sudden changes in load or outages of power generation facilities.  <\/p>\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Pumped-storage-plants-gas-turbines-and-virtual-power-plants\"><\/span>Pumped-storage plants, gas turbines, and virtual power plants<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<p class=\"wp-block-paragraph\">The secondary reserve is provided by various entities, including <strong>power plants that are easily controllable and can be switched on and off fully automatically,<\/strong> as well as <strong>virtual power plants<\/strong>. Pumped-storage power plants can quickly switch between pumping and turbine operation, and gas turbines can be started up or shut down within a few minutes. Virtual power plants aggregate decentralized generation and storage facilities such as biogas plants, hydroelectric power plants, and <a title=\"Energy Storage\" href=\"https:\/\/be-storaged.de\/en\/bess-commercial-and-industrial-storage-solutions\/\"><u>electricity storage systems<\/u><\/a>.  <\/p>\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Registration-and-Access-Through-the-Transmission-System-Operators\"><\/span>Registration and Access Through the Transmission System Operators<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-7387b849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"wp-block-paragraph\">The provision and compensation for secondary control services are handled <strong>through auctions and activations by the transmission system operators (TSOs)<\/strong>. Providers register their capacities on the relevant platforms. When needed, the facilities are activated and compensated accordingly, in accordance with the requirements of the respective control area.  <\/p>\n<\/div>\n<\/div>\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Compensation-for-Availability-and-Actual-Usage\"><\/span>Compensation for Availability and Actual Usage<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<p class=\"wp-block-paragraph\">The capacity fee is paid for the <strong>provision of secondary control power<\/strong>, while the energy fee is charged for the power actually supplied. The exact terms are determined during the auctions and may vary depending on market conditions. <\/p>\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Faster-than-TRL-slower-than-PRL\"><\/span>Faster than TRL, slower than PRL<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<p class=\"wp-block-paragraph\"><strong>The SRL supplements the primary and tertiary reserves<\/strong> to maintain the stability of the power grid. <a title=\"Primary reserve\" href=\"https:\/\/be-storaged.de\/en\/wiki\/m-n-o-p\/primary-control-reserve-prl\/\"><u>Primary reserve (PRL)<\/u><\/a> responds to sudden outages within a few seconds. Tertiary reserve is used for longer-term grid fluctuations. In the event of grid fluctuations lasting longer than 15 minutes, the secondary reserve is replaced by the tertiary reserve.  <\/p>\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion-Central-second-line-of-defense\"><\/span>Conclusion: Central second line of defense<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<p class=\"wp-block-paragraph\">Secondary control power plays a crucial role in maintaining grid stability and ensuring a reliable power supply. The integration of secondary control into the <a href=\"https:\/\/be-storaged.de\/en\/wiki\/q-r-s-t\/control-energy-stabilizing-the-power-grid-in-the-event-of-fluctuations\/\">overall balancing energy system<\/a> is essential for ensuring a reliable energy supply within the control area. <\/p>\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Frequently-Asked-Questions-FAQ\"><\/span>Frequently Asked Questions (FAQ)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What-is-secondary-control-power-SRL\"><\/span>What is secondary control power (SRL)?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n<p class=\"wp-block-paragraph\">SRL balances medium-term imbalances between electricity generation and consumption, with response times measured in minutes.<\/p>\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How-quickly-does-SRL-respond-to-grid-fluctuations\"><\/span>How quickly does SRL respond to grid fluctuations?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n<p class=\"wp-block-paragraph\">SRL reacts more slowly than PRL (seconds), but faster than TRL (15 minutes)\u2014that is, in the range of minutes.<\/p>\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Who-can-provide-SRL\"><\/span>Who can provide SRL?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n<p class=\"wp-block-paragraph\">Adjustable power plants, pumped-storage power plants, gas turbines, and virtual power plants consisting of biogas, hydroelectric, and storage facilities.<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Secondary control power (SCP) is an important component of control power in the power grid that helps balance medium-term imbalances between electricity generation and consumption and maintain grid stability. Second line of defense after the primary reserve Second ary control power responds more slowly than primary reserve, but faster than the tertiary reserveto fluctuations in [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_links_to":"","_links_to_type":0,"footnotes":""},"categories":[103,102],"tags":[],"class_list":["post-9082","post","type-post","status-publish","format-standard","hentry","category-q-r-s-t","category-wiki"],"acf":[],"_links":{"self":[{"href":"https:\/\/be-storaged.de\/en\/wp-json\/wp\/v2\/posts\/9082","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/be-storaged.de\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/be-storaged.de\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/be-storaged.de\/en\/wp-json\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/be-storaged.de\/en\/wp-json\/wp\/v2\/comments?post=9082"}],"version-history":[{"count":7,"href":"https:\/\/be-storaged.de\/en\/wp-json\/wp\/v2\/posts\/9082\/revisions"}],"predecessor-version":[{"id":12722,"href":"https:\/\/be-storaged.de\/en\/wp-json\/wp\/v2\/posts\/9082\/revisions\/12722"}],"wp:attachment":[{"href":"https:\/\/be-storaged.de\/en\/wp-json\/wp\/v2\/media?parent=9082"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/be-storaged.de\/en\/wp-json\/wp\/v2\/categories?post=9082"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/be-storaged.de\/en\/wp-json\/wp\/v2\/tags?post=9082"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}