Westar Energy will be sending rebates to customers after collecting $38 million too much last year.

The rebates, which will average about $1.26 a month, come from Westar’s Retail Energy Cost Adjustment rider, which pays for fuel for Westar’s generating plants.

The rebates were detailed in filings with the Kansas Corporation Commission.

A fuel charge means customers essentially pay the cost of Westar’s fuel, and the charge fluctuates every month. If Westar collects too much, customers get a rebate. If the utility collects too little, customers pay more.

In 2014, Westar charged customers just over $510 million for the fuel charge. But the company spent a little over $479 million.

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Associated Press Information from: The Wichita Eagle