Retroactive ratemaking “establish[es] rates to replace or be substituted to those which were charged during that period”: Bell Canada v. Canada (Canadian Radio‑Television and Telecommunications Commission), 1989 CanLII 67 (SCC), [1989] 1 S.C.R. 1722 at 1749 (“Bell Canada 1989”). Utility regulators cannot retroactively change rates (Stores Block at para. 71) because it creates a lack of certainty for utility consumers. If a regulator could retroactively change rates, consumers would never be assured of the finality of rates they paid for utility services.
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