Energy Storage

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.

The country’s previous solar target was 4 GW by 2031. Around 1.4 GW of large scale projects are expected to be tendered this year, according to a document published by the Ministry of Energy.

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.

The cash injection from Tech CU will fund the installation of ‘tens of thousands’ of the Californian manufacturer’s solar panels on residential rooftops over four years, according to the company.

The 15 GW Asian Renewable Energy Hub has been recommended for approval by environmental authorities in the Pilbara region. The project was originally intended to export clean energy to Jakarta and Singapore via subsea, high voltage DC cables but its focus has shifted to domestic industrial consumers.

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.

Scientists in South Korea have worked with graphene and carbon nanotubes to develop a working lithium-ion battery that can be stretched by up to 50% without damage to any of the components. According to the scientists, the battery represents a significant step in the development of wearable or body-implantable electronic devices.

The unfolding effects of the Covid-19 crisis, and fears of a possible second wave, have split analysts trying to guess how the unsubsidized renewables market will emerge as slumping demand continued to distort power markets. pv magazine rounds up the week’s coronavirus developments.

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.

The International Seabed Authority will change regulations for deep-sea mining this year. The ocean floor is covered with potato-sized pebbles containing high levels of cobalt, manganese, nickel and copper – materials that could soon be in short supply as the energy transition progresses.