[brudgers]

Typically electricity demand goes down at night because commercial and industrial operations tend to cycle with the workday.

In the US, it is not uncommon for KWh prices to go down off peak at night.

Also in the US, utilities are regulated and the political impact of changing rate structures upward usually requires public hearings.

Finally utilities infrastructures are capital intensive and the investment models are based on long maturity bonds. Utilities operations are structured to the goals of investors who buy long maturity bonds. I.e. utilities are operated for low risk and stable cash flows that bond holders expect.

Basically, if you have the financial wherewithal to arbitrage utilities, there might more fruits on lower branches than what you describe.

I could be wrong of course and your billions of dollars could prove it.

Good luck.