By Allison Jones THE CANADIAN PRESS TORONTO- Ontario is staring down an electricity supply crunch and amid a rush to secure more power, it is plunging into the world of energy storage, a relatively unknown solution for the grid that experts say could also change energy use at home.   Beyond the sprawling nuclear plants and waterfalls that generate most of the province’s electricity sit the batteries, the underground caverns storing compressed air to generate electricity, and the spinning flywheels waiting to store energy at times of low demand and inject it back into the system when needed.   The province’s energy needs are quickly rising, with the proliferation of electric vehicles and increasing manufacturing demand for electricity on the horizon just as a large nuclear plant that supplies 14

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