LightSail Energy is one of the most eminent startups that hails from Silicon Valley founded by Danielle Fong, Steve Crane, and Ed Berlin in 2009. LightSail Energy has the concept of low-cost grid-scale energy storage solution in order to optimise power grids, democratizing access to energy and adhere on sustainable development. Investors such as Khosla Ventures, Innovacorp, Triple Point Capital, Peter Thiel, Bill Gates have invested in LightSail Energy.
LightSail Energy produces one of the world cleanest and economical storage systems.The website of the startup is http://www.lightsail.com/ They have designed an excellent method of capturing heat energy and regenerating useful energy from compressing air. The process involves injecting fine, a dense mist of water spray which rapidly absorbs heat energy of compression and provides it during expansion. The system is fully reversible. To store energy, the system draws electricity from the grid and converts it into compressed air and heat. To deliver energy, compressed air and heat are turned back into electricity using the same system.
The system has 300+ hours of operation, 10 degrees Celcius temperature difference, 1000 rpm reciprocating piston compressor/expander and 250 KW highest power achieved. For low-cost storage, air is packed in a convenient shipping container and for large storage, underground caverns are used. This way of storing energy could be helpful in transforming intermittent wind and solar power into baseload energy.