In a high-renewables regime, there's the "duck curve" problem where renewable energy, especially solar power, is most abundant during the midday, whilst demand peaks in the early evening as lighting, heating or cooling loads (depending on season), and you guessed it, cooking loads come on-line.

If you arrive home at 17:30 and plan on eating within the half hour, you're using the most expensive electricity of the day.

That said, total cooking energy use isn't tremendously high (2--3 kW), and most heating tasks consume less than full output for well under an hour. You can operate a cooktop or oven at full heat for an hour for well under $1 unless rates are Texas-level high. That would be seriously atypical usage.

https://www.directenergy.com/learning-center/how-much-energy...

Taking advantage of lower midday rates would be possible with a crock-pot, slow-cooker, sous-vide, or similar methods, though that does require advanced planning and doesn't suit all cooking techniques.