Given that society has been around for about 200k years and power grids have been around for about 100 years, I think there would be a bit of disruption but it

Given that society has been around for about 200k years and power grids have been around for about 100 years, I think there would be a bit of disruption but it will be temporary and then things will adapt. People will sell conversion kits to change refrigerators over to using big blocks of ice, steam ships will harvest ice from icebergs. I doubt horses will come back though, presumably even without a grid factories will operate with local generators or solar/wind power farms, and trains don't need the power grid to deliver goods.