Without checking, my feeling is a "tariff" is the whole contracted agreement, and a "rate" is a part of it.
An EV electricity tariff might have a cheap night rate, and a more expensive day rate. Another tariff might be entirely variable rate (price changes every hour).
Wiktionary defines a tariff as "A schedule of rates, fees or prices." so I think my feeling is correct.
An EV electricity tariff might have a cheap night rate, and a more expensive day rate. Another tariff might be entirely variable rate (price changes every hour).
Wiktionary defines a tariff as "A schedule of rates, fees or prices." so I think my feeling is correct.