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Work begins on green hydrogen storage cavern in Sweden

Vattenfall, SSAB and LKAB are building a rock cavern storage facility in a coastal city in northern Sweden. The 100-cubic-meter facility will be built 30 meters below ground and will begin storing green hydrogen next year.

Sweden hits 1 GW milestone

The Scandinavian country saw the installation of more than 400 MW of PV systems last year. The Swedish solar market keeps being driven by rooftop PV.


‘Massless’ battery breakthrough for lightweight EVs

A new type of carbon fiber and electrolyte matrix stunned scientists when they tested its properties. Their ‘structural’ battery could be used in electric vehicles and could even address the weight problems that bedevil devices planned for electric-powered flight.

Northvolt acquires lithium-metal battery start-up Cuberg

The technology developed by a business spun out of Stanford five years ago could deliver an electrolyte with energy density of more than 1 kWh/l.


Hybrid operational strategy to use lithium-ion storage in commercial PV arrays

Lithium-ion batteries can not only improve self-consumption in commercial PV systems but are also able to efficiently perform peak shaving and price arbitrage, according to an international research group which has proposed a new strategy to calculate the best system configuration in terms of costs and revenue. The scientists specified, however, that the novel strategy may become effective only if storage system prices will drop under $250/kWh.

New method to produce silicon anodes for lithium-ion batteries

Scientists in Sweden developed a new aerogel process to manufacture silicon anodes for lithium-ion batteries, promising to offer batteries with greatly increased capacity compared to those on sale today. By growing nanometer-sized particles of silicon onto graphite, the group was able to demonstrate a device that overcomes many of the challenges common to silicon as anode material. While there are still challenges in terms of stability and capacity retention, the approach could ultimately yield low-cost, large-scale production processes.


Mini organic solar module for indoor low-power applications

Under typical indoor illumination of around 500 lux, from light sources such as LED or fluorescent light, the device’s power conversion efficiency is just below 15%. The largest device has an open-circuit voltage of 3.8 V, a short-circuit current of 146 μA, and an output power of 418 μW. The product can also be used in conjunction with capacitors to replace batteries or to prolong their lifetime in low-power applications.

Solar-plus-storage vs grid enhancement in Sweden

Sweden saw extraordinary high spot prices during last summer, due to difficult power transmission from the north, where most of power generators are located, to the south of the country, where most of the demand is concentrated. According to Swedish PV association Svensk Solenergy, solar-plus-storage offers a quick and scalable solution to avoid expensive and slow grid improvements.

European Commission approves further €2.9bn battery research project

Companies from a dozen EU member states will commit the public funds in a bid to come up with novel battery chemistries and production methods as well as recycling and circular economy innovation.


A pinch of chili gives perovskites a kick

Scientists in China found that capsaicin, the natural compound responsible for a chili pepper’s spicy flavor, can also act as a ‘secret ingredient’ in perovskite solar cells, making them both more efficient and stable. The group added capsaicin to the precursor materials of a common perovskite, leading to dramatic improvements in the resulting solar cell.

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