In what markets? In most/all of the markets I can think of, night time rates are still cheaper. Even in markets with large Solar installations (CA, USA) peak rates are still during the day.
take a look at southern california edison's time of use rates. Summer day and night are the same price, but afternoon/evening 4-9pm are more expensive or you can opt for 5-8pm way more expensive.
In the Winter though, energy is cheaper starting at 8am, when the sun is out. Still more expensive from 4-9/5-8
