Novel energy storage systems are in the news this week, from underground compressed air in California to raising and lowering sand.
today, most people think you are talking about batteries. The intermittency of renewable energy sources such as solar and wind means sometimes there is more electricity available than is needed. Batteries can take that excess electricity and store it until such time as it can be put to work. But there are other ways ofAn example of potential energy is a freight train parked at the top of a mountain.
Until now, compressed air storage has mostly been used in places with naturally occurring underground salt domes where companies can pump down water to dissolve the salt and hollow out large caverns. The only two compressed air systems in operation today are at salt domes in Alabama and Germany. Those projects depend in part on natural gas to heat the compressed air as it leaves the salt caverns because its temperature would otherwise drop significantly as it expands, reducing efficiency.
Yet Goldman Sachs studied the proposal and invested $250 million in Hydrostor last year. The Canadian Pension Plan followed with a $25 million investment a few months later. Aaron Marks, a senior analyst at energy research firm Wood Mackenzie, says he has “some degree of confidence” in Hydrostor. “As a first of its kind plant, does that mean its technology is going to work perfectly, with no problems? I doubt it,” Marks told theCompressed air storage is much less efficient than battery storage.
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