{"id":28766,"date":"2026-05-05T08:00:32","date_gmt":"2026-05-05T06:00:32","guid":{"rendered":"https:\/\/v4.cubeconcepts.de\/?p=28766"},"modified":"2026-06-11T16:28:38","modified_gmt":"2026-06-11T14:28:38","slug":"hellbrunn-may-weekend-2026","status":"publish","type":"post","link":"https:\/\/cubeconcepts.de\/en\/hellbrise-am-1-maiwochenende-2026\/","title":{"rendered":"Hellbrise on the first May weekend 2026: Causes, effects &amp; solutions"},"content":{"rendered":"<p class=\"wp-block-paragraph\">On the extended May Day weekend in 2026, a familiar but increasingly systemically relevant phenomenon reappeared in the German electricity market: a so-called <strong><a href=\"https:\/\/cubeconcepts.de\/en\/hellbrise\/\">Hellbrunn<\/a><\/strong>. This describes a situation where high feed-in from photovoltaics and wind occurs simultaneously with comparatively low electricity demand \u2013 resulting in sometimes extreme price reactions on the electricity exchange.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Record high negative electricity prices<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">On May 1st, between 1:15 PM and 2:30 PM, spot market electricity prices reached <strong>-499.99 \u20ac\/MWh<\/strong> nearly the technically defined price floor. Such a strong price level was last observed in July 2023. Later in the day, the market turned significantly: in the evening, prices rose to up to <strong>232.99 \u20ac\/MWh<\/strong> (23.3 ct\/kWh).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This resulted in an exceptional <strong>Day-ahead spread of \u20ac732.98\/MWh<\/strong>. This was not only a record high <a href=\"https:\/\/cubeconcepts.de\/en\/negative-electricity-prices\/\">negative electricity prices<\/a>, but also a clear signal of structural imbalances in the electricity system.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">On May 2nd, the trend continued: prices fell again to up to <strong>-120 \u20ac\/MWh<\/strong>. The main cause was the combination of:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>High solar and wind power generation<\/li>\n\n\n\n<li>low demand due to holiday and weekend<\/li>\n\n\n\n<li>limited flexibility options in the power system<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Power grid under pressure: Oversupply at lunchtime<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">At its peak, PV generation on May 1st was around <strong>46 GW<\/strong>, while total electricity generation was approximately <strong>59 GW<\/strong> reached. In contrast, there was a comparably low load of about <strong>43 GW<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The resulting oversupply was partially offset by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>5\u20136 GW pumped storage capacity<\/strong>, that consumed electricity<\/li>\n\n\n\n<li>run <strong>10 GW electricity exports<\/strong> abroad<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, neighboring countries were also affected by high PV feed-in, which limited export capacities and demand.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Redispatch: Interventions are becoming the rule<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In such situations, transmission system operators increasingly resort to <strong>Redispatch measures<\/strong> back. Power generation plants are specifically ramped down or up to avoid grid congestion.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The consequences:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Curtailment of renewable energies<\/strong>, especially photovoltaics<\/li>\n\n\n\n<li><strong>rising<\/strong> <strong>System costs<\/strong>, as operators are compensated for lost feed-in<\/li>\n\n\n\n<li>additional burden on grids and market mechanisms<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The costs of <a href=\"https:\/\/cubeconcepts.de\/en\/redispatch-processes-future\/\">Redispatch<\/a> have been continuously rising for years and regularly reach billions. Heat waves significantly exacerbate this problem, as large amounts of energy must be taken out of the system at short notice.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why negative electricity prices are increasing<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Negative electricity prices are no longer isolated incidents, but rather an expression of a structural trend. The main drivers:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Dynamic expansion of PV systems<\/strong> without simultaneous expansion of flexibility<\/li>\n\n\n\n<li><strong>Inflexible production structures<\/strong> (e.g., conventional power plants with minimum load)<\/li>\n\n\n\n<li><strong>Weak demand<\/strong> On weekends and holidays<\/li>\n\n\n\n<li><strong>Limited storage and load shifting capabilities<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">With the ever-increasing share of solar power, this pattern will intensify in the future, especially during midday hours.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Battery storage as a key to the solution<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The targeted expansion of <strong><a href=\"https:\/\/cubeconcepts.de\/en\/products\/large-battery-storage\/\">Battery storage systems<\/a><\/strong> is considered the central answer to the challenges of the Hellbrise. It can take on several system-relevant functions:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1. Recording of surplus electricity<\/strong><br>Battery storage systems charge specifically at negative prices, thus preventing curtailments.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Stabilization of electricity prices<\/strong><br>Arbitrage smooths out extreme price spikes and reduces volatility.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>3. Relief of the Redispatch System<\/strong><br>Fewer interventions by grid operators mean lower system costs.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>4. Provision of Balancing Power<\/strong><br>Large-scale storage can also supply primary and secondary control energy, thereby opening up additional revenue streams.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>5. Integration of Renewable Energies<\/strong><br>Storage increases the system's capacity for additional PV power.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion: Flexibility determines system efficiency<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The light breeze on the first May weekend in 2026 clearly shows: The expansion of renewable energies alone is not enough. Without the parallel development of flexibility options \u2013 especially through battery storage \u2013 system costs, redispatch requirements, and market distortions will increase.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For companies, energy providers, and investors, this results in clear areas of action:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Integration of Storage in Energy Projects<\/li>\n\n\n\n<li>Using price signals through intelligent marketing<\/li>\n\n\n\n<li>Combination of PV systems with flexibility solutions<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The energy transition is thus entering a new phase: <strong>Not just generation anymore, but system integration is becoming the decisive success factor.<\/strong><\/p>","protected":false},"excerpt":{"rendered":"<p>-500 \u20ac\/MWh at midday, over 230 \u20ac\/MWh in the evening: The light breeze in early May reveals the growing extremes in the electricity market. What's behind it \u2013 and why battery storage is becoming a key technology.<\/p>","protected":false},"author":3,"featured_media":28768,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[7],"tags":[],"class_list":["post-28766","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-solar-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Hellbrise am 1. Maiwochenende 2026 | CUBE CONCEPTS<\/title>\n<meta name=\"description\" content=\"Die Hellbrise am 1. 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