The Ontario Energy Board says by the end of 2016 all electricity distributors in the province will be required to bill their customers on a monthly basis.
In a news release this week, the OEB says it wants to help customers more effectively manage their costs.
The move has financial implications for Bluewater Power that has always billed bi-monthly.
It's estimated it could cost the local utility $200,000 a year for postage alone.
CEO Janice McMichael-Dennis says customers are encouraged to switch to paperless billing to lessen any potential impact on rates in the future.
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Bluewater Power has 36,000 customers in Sarnia, Point Edward, Petrolia, Oil Springs, Alvinston and Watford.