The Columbia utility says the increase would raise the typical residential customer's bill by $4.52 a month, from $114.20 to $118.72.
The utility asked the Public Service Commission to approve the increase to take effect in May.
SCE&G president and chief operating officer Kevin Marsh says the extra money is needed to cover the cost of coal as well as transporting the fuel.
The utility suggested the adjustment be spread over two years instead of the usual annual increase.
State law allows utilities to pass on to customers fuel costs, but does not allow the companies to profit from higher fuel costs.