Re: Would this be the same McKinsey that...
Daylight savings time was created because factories and other employers didn't have good cheap artificial light in the early days of the industrial revolution.
These days that's not really a problem. It has almost nothing to do with generating capacity as lighting is way down on the 'major usages of electric power' these days. Good LEDs changed the game.
Latest numbers I could find: Lighting was only 17% of electrical usage in the US, in 2018. It's probably gone down since then.