As electric vehicle sales rev up, there are concerns that more battery-powered and plug-in hybrid cars might disrupt the nation’s power grids.

If a large number of electric vehicles (EVs) in close proximity plug in at peak times — like after work on a hot summer’s day — it could prompt a power surge and overwhelm the local transformer. But a new report by the Texas-based Pecan Street Research Institute finds there may be little to fear, at least in the near term.

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