Tucson Electric Power (TEP), a utility in Southern Arizona with around 420,000 customers, has received approval to build two 10MW energy storage systems, including one co-located with solar, from the state’s regulator.

German utility E.On recently joined forces with German PV module and storage manufacturer Solarwatt. Energy Storage News catches up with Felix Brauer, training coordinator at SolarWatt, to discuss the partnership in detail and the benefits of a DC-coupled battery system.

German utility E.On is to develop its own energy storage products in partnership with manufacturer SOLARWATT.

Germany-based utility E.ON has invested in US energy storage software, systems and service company Greensmith, bringing the storage specialist’s Series C round of growth financing to US$18.3 million.

Construction has begun on what is claimed to be the world’s first modular large-scale battery storage system, a 5MW device at a research university in Aachen, Germany.