By J.P. Antonacci, Local Journalism Initiative Reporter, The Hamilton Spectator Last year’s sweltering summer strained the power grid as Ontarians struggled to keep cool. But the province had a powerful ace up its sleeve. Stored  inside 278 giant lithium-ion batteries — each the size of a  tractor-trailer — in rural Haldimand County was enough energy to  instantly power tens of thousands of homes when temperature spiked and  electricity demand surged. “Some  of those really hot days we had this past summer, Oneida was key to  keeping the lights on,” said Scott Matthews, vice-president of projects  with energy storage developer NRStor Inc., a partner in the Oneida Energy Storage Project  along with majority owner Northland Power, Aecon, Six Nations of the  Grand River Development Corporation and the Mississaugas of the Credit

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