Energy Management Systems

MIT scientists have suggested used electric vehicle batteries could offer a more viable business case than purpose-built systems for the storage of grid scale solar power in California. Such ‘second life’ EV batteries, may cost only 60% of their original purchase price to deploy and can be effectively aggregated for industrial scale storage even if they have declined to 80% of their original capacity.

Inverter maker Sungrow is supplying the inverters and storage system for China’s largest, 202.8 MW/MWh solar-plus-storage facility. The plant will be connected to a new, 800 kV ultra-high voltage power line.

Specialist Alencon Systems teamed up with U.S. utility Duke Energy to look at some of the challenges faced by energy companies when adding battery storage to operational solar installations. Do you go for DC-coupled or AC-coupled? And with what sort of grounding scheme?

Scottish start-up Gravitricity is planning a project to store surplus power from renewables at Port of Leith. A 250 kW, grid-connected prototype facility will have its ability to stabilize the network tested. The system involves a 16m rig over a 150-1500m shaft.

Scientists in Spain have assessed the viability of ‘power-to-heat-to-power storage’ in a residential solar installation in Madrid. The technology could reduce electricity bills by more than 70% and would have a 12 to 15-year payback period, according to the researchers.

Researchers have studied the potential of using compressed air to store renewable energy in offshore saline aquifers. The technology could hold 77-96 TWh for up to two months in British waters, although the costs have proven hard to pin down.

Matt Harper, chief commercial officer of newly-merged British-Canadian vanadium redox flow battery business Invinity Energy Systems has spoken to pv magazine about the VS3-022 Battery Unit it is marketing for grid scale solar-plus-storage projects and why it may be a better bet than lithium-ion.

Today’s edition of the Official Journal of the French Republic featured two long-awaited decrees: One concerning the multi-year energy program and another on national carbon budgets and the state’s low-carbon strategy.

A group of scientists in the United States has developed a weather forecasting model designed to better predict the solar irradiation that a given area will receive. The model uses satellite data to estimate the light transmission properties of clouds, a metric often overlooked in standard weather forecasting, but nonetheless vital in modeling PV energy yield.

Perhaps it is not surprising a report co-produced by Europe’s solar industry places PV at the heart of a zero-carbon, mid-century energy system on the continent. However, the study does flesh out two out of three scenarios in which becoming carbon-neutral by 2050, or even 2040, could be possible.