{"id":14864,"date":"2024-05-22T07:24:37","date_gmt":"2024-05-22T05:24:37","guid":{"rendered":"https:\/\/cubeconcepts.de\/?p=14864"},"modified":"2026-06-12T07:56:21","modified_gmt":"2026-06-12T05:56:21","slug":"dark-doldrums-a-challenge-for-renewable-energies","status":"publish","type":"post","link":"https:\/\/cubeconcepts.de\/en\/dunkelflaute-herausforderung-fuer-erneuerbare-energien\/","title":{"rendered":"Dunkelflaute: What it means and how it can be solved"},"content":{"rendered":"<p class=\"wp-block-paragraph\"><em>(Updated April 2026)<\/em> The so-called <strong>Dark doldrums<\/strong> is considered one of the greatest challenges of the energy transition. It describes a weather situation in which <strong>at the same time there is hardly any wind and little solar energy is available<\/strong> \u2013 exactly when renewable energies supply very limited electricity. So it is the exact opposite of a <a href=\"https:\/\/cubeconcepts.de\/en\/hellbrise\/\" type=\"post\" id=\"23390\">Hellbrunn<\/a>. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But how critical is the \"dunkelflaute\" really \u2013 and what solutions are there?<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is a dark doldrum?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A dark doldrum is a period in which:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>when little wind energy is generated (calm)<\/strong><\/li>\n\n\n\n<li><strong>when little or no solar energy is available (e.g., at night or during heavy cloud cover)<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sequence: Electricity generation from wind and PV systems can <strong>less than 2 % of installed capacity<\/strong> sink.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">These situations are typical, especially in winter, and they can <strong>several days to over a week<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Is there an official definition?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">No, a single definition does not exist.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Depending on how you look at it:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>frequent short events<\/strong>several times a year<\/li>\n\n\n\n<li><strong>longer critical phases (&gt; 1 week)<\/strong>about every 5\u201310 years<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For the energy industry, especially <strong>multi-day periods of darkness with high load<\/strong> relevant.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why is the Dunkelflaute a problem?<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. Supply gap in the electricity system<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">When wind and solar power fail simultaneously:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>is the demand for <strong>Backup capacities<\/strong><\/li>\n\n\n\n<li>electricity in the short term <strong>imported or conventionally generated<\/strong> become<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. High electricity prices<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Shortage leads to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>rising stock market electricity prices<\/li>\n\n\n\n<li>higher costs for businesses<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. CO\u2082 emissions rise in the short term<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Without sufficient alternatives:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Deployment of <strong>Gas or coal power plants<\/strong><\/li>\n\n\n\n<li>Goal conflict for climate neutrality<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4. Grid Stability Under Pressure<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Higher demands on network management and reserve power<\/li>\n\n\n\n<li>Frequency holding becomes more difficult<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What is a \u201ecold dark doldrums\u201c?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A particularly critical form is the <strong>cold doldrums<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>usually occurs in winter<\/li>\n\n\n\n<li>combined <strong>low power generation with high consumption<\/strong><\/li>\n\n\n\n<li>e.g. through heating demand and industrial production<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This situation places the energy system under maximum strain.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How can the dark doldrums be solved?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The good news: There is <strong>no single solution<\/strong>, but an effective mix of measures.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Grid Expansion &amp; European Networking<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Expansion of <strong>High-voltage direct current (HVDC)<\/strong><\/li>\n\n\n\n<li>Long-distance power transmission<\/li>\n\n\n\n<li>Balancing regional weather differences<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Example: Wind power from Northern Europe compensates for calms in Central Europe.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Energy storage as a key technology<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Short-term memory:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Battery Energy Storage System (BESS)<\/li>\n\n\n\n<li>Ideal for hours to days<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Long-term storage:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pumped storage power plants<\/li>\n\n\n\n<li>Gravity storage and compressed air caverns<\/li>\n\n\n\n<li>Hydrogen (Power-to-Gas)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Goal: Store surpluses and retrieve them during dark doldrums<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. Flexible Backup Power Plants<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Current: Flexible <strong>Gas power plants<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">perspectival<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hydrogen power plants<\/li>\n\n\n\n<li>Biomass<\/li>\n\n\n\n<li>Geothermal<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Important: quickly adjustable power<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. Sector Coupling<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/cubeconcepts.de\/en\/sector-coupling-for-integrated-energy-concepts\/\" type=\"post\" id=\"17823\">Sector coupling<\/a> is the connection of:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Strom<\/li>\n\n\n\n<li>Heat<\/li>\n\n\n\n<li>Mobility<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Examples:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Control heat pumps flexibly<\/li>\n\n\n\n<li>Targeted charging of e-cars<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Energy is optimized across systems<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5. Flexible electricity demand<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Companies can actively contribute:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/cubeconcepts.de\/en\/load-shifting-with-best\/\">Load shifting<\/a> Demand-Side Management<\/li>\n\n\n\n<li>Use of dynamic electricity tariffs<\/li>\n\n\n\n<li>Adaptation of production times<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Power consumption follows generation \u2013 not the other way around<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">6. Decentralized Energy Supply<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Commercial roof solar power systems<\/li>\n\n\n\n<li>On-site battery storage<\/li>\n\n\n\n<li>Combination with <a href=\"https:\/\/cubeconcepts.de\/en\/products\/cube-efficiencyunit\/\" type=\"page\" id=\"18381\">Energy management systems<\/a> (EMS)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This reduces network dependency and stabilizes the overall system.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">7. Hydrogen as a long-term storage<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Centrally in the long term:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Storage of large amounts of energy<\/li>\n\n\n\n<li>Use of existing gas infrastructure<\/li>\n\n\n\n<li>Power generation on demand<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Potential: Secure supply for weeks or months<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What role do companies play in dark doldrums?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Companies are a crucial part of the solution:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Self-sufficiency with <strong>PV + Storage<\/strong><\/li>\n\n\n\n<li>Participation in <strong>Flexibility markets<\/strong><\/li>\n\n\n\n<li>Peak load reduction<\/li>\n\n\n\n<li>Integration in intelligent energy systems<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Result:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Contribution to grid stability<\/li>\n\n\n\n<li>lower electricity costs<\/li>\n\n\n\n<li>higher security of supply<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion: Dunkelflaute is solvable \u2013 but only systemically<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The dark doldrums are not an insurmountable hurdle, but a <strong>plannable challenge<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A stable energy system of the future is based on:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>renewable energies<\/li>\n\n\n\n<li>Save<\/li>\n\n\n\n<li>flexible consumers<\/li>\n\n\n\n<li>intelligent grid infrastructure<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The interplay of all components is crucial.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For companies, this means that those who invest in flexible energy supply today will secure economic advantages and reduce risks in an increasingly volatile energy market.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently Asked Questions<\/h2>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>What is a dark doldrum?<\/summary>\n<p class=\"wp-block-paragraph\">A \"dunkelflaute\" (dark calm) is a weather condition characterized by very little wind and low solar energy availability simultaneously. This causes a significant drop in electricity generation from renewable sources.<\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>How often does a period of low wind occur?<\/summary>\n<p class=\"wp-block-paragraph\">Short periods of darkness occur several times a year. Longer, critical phases with very low electricity generation lasting several days occur on average every 5 to 10 years.<\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>How long does a period of darkness or low sunlight last?<\/summary>\n<p class=\"wp-block-paragraph\">The duration can vary greatly:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>extended periods of darkness: up to 7-10 days or more<\/li>\n\n\n\n<li>Short-term events: 1\u20133 days<\/li>\n<\/ul>\n<\/details>\n<\/details>\n<\/details>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Dunkelflaute is problematic because it refers to a period of low wind and low solar irradiation, meaning that both wind turbines and solar panels produce very little electricity. This can be a significant challenge for the energy supply, especially in regions that rely heavily on renewable energy sources like Germany.<\/summary>\n<p class=\"wp-block-paragraph\">During a period of low wind and solar power generation, electricity production from wind and solar power plants drops significantly. At the same time, electricity demand remains or even increases, leading to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>higher electricity prices<\/li>\n\n\n\n<li>can lead to increased demand for backup power plants.<\/li>\n\n\n\n<li>rising CO\u2082 emissions<\/li>\n<\/ul>\n<\/details>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>How can a period of low wind generation be overcome?<\/summary>\n<p class=\"wp-block-paragraph\">Several measures are combined to bridge the gap:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Battery storage and pumped-storage hydroelectricity <\/li>\n\n\n\n<li>Hydrogen as long-term storage <\/li>\n\n\n\n<li>Flexible gas power plants <\/li>\n\n\n\n<li>European power grids <\/li>\n\n\n\n<li>Load management and flexible consumers<\/li>\n<\/ul>\n<\/details>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>What role do companies play in dark doldrums?<\/summary>\n<p class=\"wp-block-paragraph\">Companies can actively contribute to the solution through:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Usage <a href=\"https:\/\/cubeconcepts.de\/en\/dynamic-electricity-tariffs\/\" type=\"post\" id=\"21612\">dynamic electricity tariffs<\/a><\/li>\n\n\n\n<li>Self-sufficiency with photovoltaics and battery storage<\/li>\n\n\n\n<li>Load shifting (Demand Side Management)<\/li>\n<\/ul>\n<\/details>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Will the Dunkelflaute halt the energy transition?<\/summary>\n<p class=\"wp-block-paragraph\">No. The Dunkelflaute is considered a solvable challenge. By expanding storage, grids, and flexible energy systems, supply security can be guaranteed even with renewable energies.<\/p>\n<\/details>","protected":false},"excerpt":{"rendered":"<p>When calm winds meet cloud cover, the power system comes under pressure \u2013 but the \"Dunkelflaute\" (the period of darkness and windless skies) is no longer an unsolvable problem. Particularly companies can actively contribute to grid stability through self-sufficiency with PV storage systems and by participating in flexibility markets, while simultaneously securing their own energy costs.<\/p>","protected":false},"author":3,"featured_media":14867,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1,61,25],"tags":[],"class_list":["post-14864","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-batteriespeicher","category-grundlagen-technik","category-photovoltaik"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Dunkelflaute erkl\u00e4rt: Bedeutung, Risiken &amp; L\u00f6sungen | CUBE CONCEPTS<\/title>\n<meta name=\"description\" content=\"Was ist eine Dunkelflaute? 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