Shutterstock Save for later Print Download Share LinkedIn Twitter As the energy transition progresses, there is a growing need to counter intermittency from renewables over a longer timeframe than lithium-ion batteries can competitively offer. Traditionally, this role for providing storage beyond a few hours has been dominated by pumped hydropower stations. Today, hopes are building that compressed air storage energy, or CAES, could offer a viable alternative sometime this decade. The technology grabbed headlines earlier this month when the private equity arm of Goldman Sachs offered $250 million in funding to Canadian developer Hydrostor.