skip to content
☀️ Solar Currents

Search

Solar hits 25% of EU grid as heatwave shuts nuclear

PLUS: Georgia approves 3.2 GW OpenAI deal without public vote, UK legalizes plug-in solar nationwide

PLUS: Georgia approves 3.2 GW OpenAI deal without public vote, UK legalizes plug-in solar nationwide

Subscribe on Substack | Visit solarcurrents.co

Good morning. Solar generated 25% of EU electricity during June-July heatwaves. The same extreme heat forced France to shut down 11 GW of nuclear capacity because rivers were too hot for cooling. Poland's coal plants went offline when the Vistula dried up. Solar ran 17% above normal during peak afternoon demand.

When evening prices spiked to €900/MWh in Hungary, the grid exposed what 'reliability' means when thermal plants can't handle the climate conditions we're already seeing. The infrastructure gap isn't baseload. It's storage to shift daytime solar into evening hours.

In today's Solarpunk Currents:

  • Solar delivers while nuclear and coal shut down in European heat
  • Georgia approves 3.2 GW OpenAI deal with no public vote
  • UK legalizes plug-in solar as major retailers stock systems
  • Solar-plus-storage investment hits $25B as developers hedge revenue risk

Subscribe to Solarpunk Currents on Substack →

Solar delivers while 'reliable' nuclear and coal shut down in deadly European heat

The Bottom Line: Solar generated 25% of EU electricity during June-July 2026 heatwaves. The exact conditions that forced France to shut down 11 GW of nuclear capacity because rivers were too hot for cooling. Polish coal plants shut down when the Vistula dried up. Solar ran 17% above normal during peak afternoon cooling demand, while conventional power failed when communities needed it most.

The Story: On July 12, France had 29 GW of nuclear capacity offline (43% of its fleet) as river temperatures climbed too high to discharge cooling water without killing aquatic life. That same day, solar output across the EU hit record levels, covering the afternoon surge in air conditioning demand. In Poland, Enea's Kozienice and Połaniec coal plants cut 1.3 GW when the Vistula ran too low for cooling. The thermal plants built for reliability couldn't run in the heat that made them necessary.

By the numbers:

  • Solar output was 17% higher during heatwaves in France and Hungary compared to other June-July days, according to Ember analysis
  • Daily electricity demand jumped 28% in Italy and 23% in Hungary during heatwave peaks as air conditioning use soared
  • Evening prices spiked to €900/MWh in Hungary on June 30 and €313/MWh in France on June 24, highest since the 2022 gas crisis
  • Co-located solar-plus-storage projects attracted a record $25 billion in H1 2026 investment globally, according to BloombergNEF

What remains: The extreme evening price spikes expose the infrastructure gap. Solar covered daytime cooling demand, but prices hit €900/MWh after sunset when demand stayed high and solar dropped off. Europe needs battery storage to shift daytime solar into evening hours, not more baseload generation that shuts down in heat.

Georgia approves secret 3.2 GW data center deal with no public vote

The Bottom Line: Georgia's Public Service Commission staff approved a 3.2 GW contract between Georgia Power and OpenAI without elected commissioners voting on it. The approval came through a joint utility-commission letter instead of transparent review, bypassing public accountability for a load equivalent to three nuclear reactors. Ratepayers have no protection if OpenAI uses less power than contracted.

The Story: Sierra Club's Hannah Baker called the process "a reckless rush to build A.I. data centers with no regard to the communities they impact." The Southern Alliance for Clean Energy pointed out the unanswered questions: how Georgia Power calculates costs for these deals, and what happens if the data center leaves or needs less power. No public process exists to review those calculations.

By the numbers:

What remains: The Georgia PSC must update its review process to require elected commissioners to vote on contracts this size. Without transparent cost calculations and ratepayer protections, utilities can lock in profits while offloading risk to the public.

UK legalizes plug-in solar nationwide as major retailers stock systems

The Bottom Line: Starting August 27, UK residents can install plug-in solar up to 800W without certified installers following regulatory amendments to plug and socket rules. Systems cover up to 20% of household electricity and save up to £110 ($150) annually. Major retailers Argos, Screwfix, Amazon, and Currys plan to stock systems this fall.

The Story: Solar has moved from specialty equipment to retail product. Screwfix, a trade tool retailer, will list plug-in solar alongside hardware this fall. Argos and Wickes plan to stock systems near garden furniture. When major retailers commit shelf space to distributed generation, it normalizes solar as something anyone can access, not just homeowners who can afford certified installers.

By the numbers:

  • UK households can now self-install one 800W array per home, matching installation limits in other European markets
  • Annual savings reach up to £110 ($150) covering up to 20% of average household electricity use
  • Germany has 4 million balcony solar installations deployed under similar plug-in rules, showing the UK market potential
  • Only 7 legally compliant devices currently listed on UK government database, all from one supplier (UKSOL)
  • Planning permission eliminated for plug-in solar in England; Scotland and Wales set own rules

What remains: Plug-in battery storage remains illegal pending safety review. Despite retailer commitments, only seven compliant solar products exist on official databases. The regulatory change has arrived, but the market hasn't caught up yet.

Solar-plus-storage investment hits $25B as developers hedge against revenue risk

The Bottom Line: Global investment in co-located solar-plus-storage projects reached $25 billion in the first half of 2026, nearly double the previous six months and three times the first half of 2025. Developers are building batteries into solar projects to manage growing revenue uncertainty from price cannibalization, curtailment, and grid congestion. Standalone solar investment fell 20% to $75.4 billion over the same period.

The Story: The shift shows developers responding to market realities rather than ideology. Solar projects that flood the grid during peak generation hours face steep price drops and curtailment orders. Adding storage lets projects capture that energy and sell it when prices recover. The US and Australia led the buildout, with American developers rushing to meet tax credit deadlines while data center electricity demand surged. This is the transition adapting. Not smoothly, but pragmatically.

By the numbers:

  • Solar-plus-storage investment: $25 billion in H1 2026, up from $13 billion in H2 2025, per BloombergNEF data
  • Standalone solar investment: $75.4 billion, down 20% year over year
  • US solar investment hit $45.8 billion, up 41% as developers raced to lock in tax credits
  • Total renewable energy investment: $327.5 billion, flat from previous six months but 21% below H2 2024 record

What remains: BloombergNEF expects 2026 to mark the first year over year decline in new renewable energy installations in over a decade, with growth resuming in 2027. The investment shift toward hybrid projects shows market adaptation, but total capital deployed is still below 2024 levels.

The Quick Scribbles

Intertek reported a rise in junction box failures across utility scale and rooftop solar installations, with defects buried during manufacturing causing field failures years after installation. The testing firm's analysis shows these hidden defects escape factory quality control and only manifest after extended field exposure, creating warranty and performance risks for project owners.

Note: Additional stories were not available from the provided source material that met the criteria of being unique from already covered newsletter content and having valid specific URLs.

Solarpunk Currents covers the clean energy transition through a solarpunk lens: community power, climate justice, and imaginative futures. Subscribe on Substack or visit solarcurrents.co.