NEW ORLEANS (AP) — The Louisiana Public Service Commission has approved a one-time refund for customers of Entergy Louisiana and Entergy Gulf States Louisiana.

The commission Wednesday authorized the refunds which will show on customers' bills starting at the end of October. The LPSC estimates the credit to the average residential customer will be about $16.75 for an Entergy Gulf States Louisiana customer and $7.50 for an Entergy Louisiana customer.

The refund comes in response to a lawsuit brought by the commission against Entergy over how the company spreads the cost of electric generation over its subsidiaries in Louisiana, Mississippi, Arkansas and Texas.

The LPSC asked FERC to correct flawed refund calculations made by Entergy for 2007, 2008 and 2009.

Entergy Louisiana and Entergy Gulf States Louisiana has about 900,000 customers combined.