A ‘hybrid’ plant for storing wind energy in batteries has been constructed by infrastructure and energy firm Acciona in Spain, thought to be the first such project in the country.

In less than a week, more than 180,000 Spanish citizens have signed a petition against plans for a new ‘sun tax’ on use of batteries for residential self-consumption of solar energy in Spain.

The International Electrochemical Commission (IEC) will begin a programme of standardisation for redox flow batteries – which can be used for large scale energy storage applications – following discussions which were initiated in Japan in October 2013.