Sweden

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.

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.

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.

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.

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.

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.

European renewables, including Spanish solar, made big gains as energy demand recovered before the second wave of Covid infections. Nuclear was a notable loser, in part because clean energy volumes in the north of the continent drove down power prices sufficiently to make reactors uncompetitive.

Looking back over years of research into the topic of hybrid systems based on different combinations of solar, wind, hydro and other renewables, an international group of scientists found strong potential for strategies to exploit complementarity between the different sources integrate more intermittent renewables onto regional and national grids. The scientists present a series of conclusions and recommendations that aim to push research in hybrid renewables forward.

Researchers have just under four weeks to apply for backing for their projects, in areas including battery reuse and recycling, circular manufacturing and supercapacitors.

Sweden was set to replace its rebate scheme with unspecified tax breaks by the end of this year, but the government has instead decided to allocate another $31.5 million for 2021 – for enterprises and municipalities only.