The regulated price of gasoline in Nova Scotia is expected to change at midnight, a couple of days earlier than prices are normally set in the province.
The Utility and Review Board says it will use the power it has to interrupt the normal date it uses to set prices because of a significant shift in the market price of gas.
It will not be used to adjust diesel prices this week.
The last time the clause was used was in October 2012, which saw gas prices drop by 5.3 cents per litre.
Under the regulated system, prices are normally set each Friday by the review board at 12:01 a.m.
The board says the regular weekly price adjustment is still expected to happen this week.
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