That is an excellent question, and we’ve had to do a bit of research to answer it.
The product you mention is a battery that is useful for storing electricity generated by solar panels or for storing electricity when prices are low in order to use it when prices climb back up.
Therefore, if you generate your own energy, using solar panels or small wind turbines, for instance, your Hydro-Québec bill will naturally go down.
That being said, if you intend to charge your Powerwall batteries with the electricity we sell you, you’re going to pay the same rates for the kilowatthours you will need to charge them.
It bears noting that Hydro-Québec has no time-of-use charges, as is the case with other providers. Rates stay the same no matter the time of day. There is no gain to be had in this sense.