By Rebecca Smith 

Southern Co. will take a $380 million charge in the first quarter to reflect the rising cost of its "clean coal" power plant under construction in Kemper County, Miss., bringing total shareholder loss on the project to about $1.6 billion.

When it starts full operations, the Kemper plant will convert an inexpensive grade of local coal into a flammable gas that can be used to generate electricity. But the power project has been plagued by delays and construction problems, pushing the cost to more than $5.5 billion.

Mississippi consumers are somewhat protected from Kemper's cost overruns thanks to an agreement between the utility and state regulators that caps the amount customers can be charged for the project. But the plant's costs still are expected to push up rates in coming years.

"We're trying to come up with a rate plan that works for everybody," said utility spokeswoman Christy Ihrig.

Southern said Tuesday it won't be able to get the coal gasifier in working condition this year--its goal--and will have to forfeit federal tax benefits valued at between $120 million to $150 million. The company hopes to begin making electricity at the plant with conventional natural gas sometime this summer.

As costs rise, the utility is fending off criticism and legal attacks from consumer advocates and others who are opposed to the expensive project, which many believe is the most costly fossil-fuel burning power plant ever built in the U.S.

Last week, the company suffered another setback when the Mississippi Public Service Commission approved a motion filed by commission staff that asked for a delay in hearings about the Kemper plant's expense. In order to charge customers for the plant, the utility must demonstrate it has spent money wisely. Those hearings now are delayed until at least August.

Southern is confident "all cost incurred in the construction of Kemper is prudent," Ms. Ihrig said.

The Mississippi Supreme Court earlier this month asked the public service commission for additional information about Kemper approvals. The court's request comes in response to a customer lawsuit that argues the regulator shouldn't allow the utility to charge consumers anything related to the power plant until it is furnishing customers with electricity. Some financing costs already are being included in customer bills.

Write to Rebecca Smith at rebecca.smith@wsj.com

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