Western Europe

With projects in many PV markets ageing past the 10-year mark – with major leaps in technology having occurred in that time – revamping is a popular topic among asset owners. Pv magazine spoke with Asier Ukar, general manager of the Spanish subsidiary of German testing company PI Berlin, to uncover the benefits of revamping PV projects with new components and also to examine the challenges and risks involved.

Romande Energie and Swiss research institute Agroscope are testing startup Insolight’s transparent PV panels in an agrivoltaic project. The modules are replacing the plastic covers used to grow strawberries and raspberries.

Although self-consumption of solar power is the optimal economic approach, the expense of household batteries at present outweighs the increased ability they offer to use electricity generated on the roof. Whether aggregated ‘virtual batteries’ offer better returns is an open question, due to lack of electricity company transparency.

The use of ultrasonic sound waves has been applied to battery recovery. Researchers from the ReLiB project at the U.K.’s Faraday Institution say the process has already proven to be 100 times faster than conventional approaches. It is also much more sustainable and less energy intensive.

Underwater gravity energy storage has been proposed as an ideal solution for weekly energy storage, by an international group of scientists. The novel technology is considered an alternative to pumped-hydro storage for coasts and islands without mountains that are located close to deep waters, and may also be interesting for PV if used to store green hydrogen.

France’s Revolt Energy Green has developed a flexible solar+storage solution for one-off events, construction sites, and different kinds of off-grid applications. It has also developed a mobile hydrogen solution.

Conventional incentives such as renewable portfolio standards, feed-in tariffs or feed-in premium payments may lead to a price cannibalisation scenario for wind and solar, according to a new study from a German-Swedish research group. CO2 pricing is, however, considered an efficient tool to maintain their market value high enough to ensure new investments. A total system cost approach, rather than an LCOE perspective, is needed to understand the strong dependence of market value on policy choice though.

Spanish renewable energy company Acciona is testing four second-life batteries with a combined capacity of 130 kWh at its 1.2 MW experimental solar park in Tudela, in the Spanish region of Navarra.

The Italian manufacturer has showcased a high-power multi-MPPT string inverter and modular conversion solution – designed to supply both decentralised and centralised systems.

A French start-up has developed a concrete flywheel to store solar energy in an innovative way. Currently being tested in France, the storage solution will be initially offered in France’s overseas territories and Africa.