{"id":783,"date":"2025-09-25T12:26:02","date_gmt":"2025-09-25T12:26:02","guid":{"rendered":"https:\/\/heatpumpingtechnologies.org\/project57\/?post_type=case_studies&#038;p=783"},"modified":"2025-09-25T12:26:02","modified_gmt":"2025-09-25T12:26:02","slug":"large-heat-pumps-in-stockholm","status":"publish","type":"case_studies","link":"https:\/\/heatpumpingtechnologies.org\/project57\/case-studies\/large-heat-pumps-in-stockholm\/","title":{"rendered":"Large heat pumps in Stockholm"},"content":{"rendered":"<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">Stockholm, Sweden<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \"><\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \">The Stockholm district heating system is large with over 12 TWh of heat<br>demand annually. Since the 1970s the system has been operated with both<br>combined heat and power (CHP) and heat pumps (HP). About 660 MW of<br>heat pumps and 300 MW of electric boilers are currently operational in this<br>system.<br><br>The operation of the district heating system is optimized taking into account<br>the heat demand, electricity and fuel prices and congestions in the district<br>heating network. In figure 1 a normal yearly duration curve for the<br>Stockholm district heating system can be seen. CHP with different kinds of<br>waste as fuel (blue area) is the bas load production together with CHP with<br>wood chips as fuel (dark green area). The coal fired CHP (black area in<br>middle) is today (2022) replaced with bio CHP. Normally HP is the next<br>generation source (white area). Above HP comes CHP with pellets as fuel and<br>solid bio heat only boilers (HOB) and turbine bypass (light green area). On<br>top is bio oil and then fossil oil HOB (black area on top). On daily basis<br>depending on electricity prices and bio fuel prices HP can replace bio fuel<br>CHP or be replaced by pellets bio fuel CHP. When the electricity prices are<br>extremely high HP can be replaced by solid HOB and turbine bypass. And<br>also the other extreme with very low or negative electricity prices can result<br>that HP replace wood chip CHP.<\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<ul class=\"wp-block-list\"><\/ul>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \"><\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \"><a href=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/69\/2025\/01\/two-pager-task-2-sweden-stockholm.pdf\">Two page summary<\/a><br><br><a href=\"https:\/\/heatpumpingtechnologies.org\/content\/uploads\/sites\/69\/2024\/12\/annex-57-task-2-sweden-large-heat-pumps-in-stockholm.pdf\">Full report<\/a><\/p>\n<\/div>\n\n<div class=\"container container--no-margin\">\n<p class=\"wp-block-paragraph \"><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Stockholm, Sweden The Stockholm district heating system is large with over 12 TWh of heatdemand annually. Since the 1970s the&#8230;<\/p>\n","protected":false},"author":61,"featured_media":0,"menu_order":0,"template":"","filters":[92,95,86],"markets":[13],"applications":[42,39],"class_list":["post-783","case_studies","type-case_studies","status-publish","hentry","filters-central-hp-and-dh","filters-in-operation","filters-sweden","markets-sweden","applications-cities-communities","applications-system-integration-flexibility"],"acf":[],"_links":{"self":[{"href":"https:\/\/heatpumpingtechnologies.org\/project57\/wp-json\/wp\/v2\/case_studies\/783","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/heatpumpingtechnologies.org\/project57\/wp-json\/wp\/v2\/case_studies"}],"about":[{"href":"https:\/\/heatpumpingtechnologies.org\/project57\/wp-json\/wp\/v2\/types\/case_studies"}],"author":[{"embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/project57\/wp-json\/wp\/v2\/users\/61"}],"version-history":[{"count":1,"href":"https:\/\/heatpumpingtechnologies.org\/project57\/wp-json\/wp\/v2\/case_studies\/783\/revisions"}],"predecessor-version":[{"id":784,"href":"https:\/\/heatpumpingtechnologies.org\/project57\/wp-json\/wp\/v2\/case_studies\/783\/revisions\/784"}],"wp:attachment":[{"href":"https:\/\/heatpumpingtechnologies.org\/project57\/wp-json\/wp\/v2\/media?parent=783"}],"wp:term":[{"taxonomy":"filters","embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/project57\/wp-json\/wp\/v2\/filters?post=783"},{"taxonomy":"markets","embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/project57\/wp-json\/wp\/v2\/markets?post=783"},{"taxonomy":"applications","embeddable":true,"href":"https:\/\/heatpumpingtechnologies.org\/project57\/wp-json\/wp\/v2\/applications?post=783"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}