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Spain has expanded its energy community programme with 20 new projects, bringing the national total to 262 and unlocking €108.4 million in EU-backed funding. Unevenly distributed across regions, the energy communities deployed in Spain to date combine solar generation, storage, efficiency, and mobility solutions, delivering 175.3 MW of PV capacity and involving more than 111,000 citizens.

Germany risks leaving taxpayers liable for at least €34.7 billion ($40.8 billion) in unrecovered hydrogen infrastructure costs by 2055, the Institute for Energy Economics and Financial Analysis (IEEFA) says in a new report, putting the true regulated cost base at approaching €50 billion against the commonly cited €19.8 billion construction figure.

U.S. researchers developed a meta-weakly solvating electrolyte that optimizes sodium-ion solvation structure, enabling faster ion transport, reduced side reactions, and improved interfacial stability in high-voltage sodium-ion batteries. This design significantly extends cycle life and outperforms conventional and localized high-concentration electrolytes by promoting more uniform and stable electrode–electrolyte interfaces.

The Czech government is reviewing proposals to streamline procedures for new solar power plants, including increasing the threshold for paying electricity tax to 100 kW and preventing double taxation on projects installing both solar and storage.

New research from China reveals that ultraviolet degradation in TOPCon solar cells is governed by interface-level physical mechanisms involving hydrogen dynamics, defect formation, and charge evolution. These processes are strongly influenced by the design of the silicon nitride/aluminum oxide passivation stack, which determines long-term device stability.

An international research team has improved the performance of perovskite indoor photovoltaics by tuning the absorber bandgap to better match the emission spectrum of indoor LED lighting. The approach enables improved spectral alignment under low-light conditions, with devices demonstrating efficiencies of up to 37.44% alongside long-term stability exceeding 2,000 hours.

Bhutan has kicked off a tender to develop 12.1 MW of rooftop solar across 73 public healthcare facilities in the country. The initial deadline to submit expressions of interest is May 29.

UK-based consultancy Ricardo, part of the WSP Group, reports that EU-27 day-ahead power markets saw 1,223 negative-price hours in Q1 2026, more than double Q1 2025, driven mainly by Spain, Portugal, and Greece, while Nordic markets fell back to zero after prior spikes. Germany’s April 2026 data shows negative prices aligning with large renewable forecast errors and likely curtailment during oversupply periods.

Perigus Energy has named Meta, Amazon, Johnson & Johnson, Flogas, and SWW Wunsiedel as corporate power offtakers, confirming that 204.85 MW – just more than 35% of its 578 MW operational portfolio – is contracted through corporate power purchase agreements (PPAs).

In a new weekly update for pv magazine, OPIS, a Dow Jones company, provides a quick look at the main price trends in the global PV industry.