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Hilo Energy Experience
(lemmy.ca)
I've switched to Flex D, and I'm using Home Assistant to manage peaks. Already saved about 160$ this winter, I really like it.
Can't really help you with Hilo, though. I've avoided that program for exactly the reason you mention, you kinda have to stay within their walled garden for all of it to work.
Not exactly sure if you would be able to achieve it like this, but you may be able to using HomeAssistant and the Hilo integration: https://github.com/dvd-dev/hilo