Electricity-producing bacteria could be an intriguing renewable energy source. Engineers have now developed a biobattery that contains three layers of different bacteria species, which together take in sunlight and produce electricity.

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Sesame Solar announced this week what it calls the world's first 100-percent renewable mobile nanogrid. Powered by a wing-like solar panel spread and green hydrogen, the modular nanogrid brings weeks of autonomous electricity where it's most needed.

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In many ways, space is the perfect place for a solar energy array. In other ways, it poses massive technical challenges. China's Xidian University has begun testing the full range of space solar functions with a purpose-built 75-meter tower facility.

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A Norwegian team has claimed a world-first, running a gas turbine on 100 percent hydrogen. The modifications made to the turbine, fuel systems and the natural gas infrastructure, could be used to convert other turbines to zero emissions.

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Researchers at the National Renewable Energy Laboratory have broken the world record for solar cell efficiency. Reaching almost 40 percent, the new device boasts the highest efficiency recorded for any type of solar cell in real-world conditions.

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While stellarator fusion reactors have conventionally featured irregularly shaped magnetic coils, scientists have now developed simpler and straighter versions they say can offer some important benefits.

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The US Department of Defense has announced that its Strategic Capabilities Office will go ahead with its plan to build and test a small nuclear reactor capable of being moved, and delivering between 1 - 5 MW of power for a minimum of three years.

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In what it describes as the most significant demonstration of its kind in half a century, the US Naval Research Laboratory (NRL) beamed 1.6 kW of power over a kilometer (3,280 ft) using a microwave beam at the US Army Research Field in Maryland.

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MIT says its new thermophotovoltaic heat engine can harvest more energy from heat than the average steam turbine, at a fraction of the cost and using no moving parts. Huge implications for future power stations, as well as grid-level energy storage.

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A team at Pacific Northwest National Laboratory has demonstrated a type of "hibernating" battery that can preserve its energy for months at a time and release it on demand when heated up, ticking some important boxes for renewable energy storage.

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