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On the face of it, the scheme sounds like a winner.
Like a kind of arbitrage, it takes inexpensive electricity and turns it into expensive electricity. And it saves billions of dollars that would otherwise be spent building new generating capacity.
Unlike other projects to store cheap electricity and release it during periods of high demand, the current proposal by TC Energy, a company better known to Canadians by its former name TransCanada Corporation, the Keystone pipeline builder, is more than just a green experiment.
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