Few (if any?) residential energy markets in the United States have intraday pricing. The EU requires intraday electricity pricing for membership FWIU.

Also it's not uncommon for the price of electricity to go below zero in markets with heavy subsidization to accelerate progress toward clean energy.

From "German power prices turn negative amid expansion in renewables" (2025) https://news.ycombinator.com/item?id=42603130 :

> Given the intraday prices, are there sufficient incentives to stimulate creation of energy storage businesses to sell the excess electricity back a couple hours or days later?