The cost of the Kemper County power plant is up another $45 million, Mississippi Power reported Tuesday.
The latest increase brings the total cost of the plant to $6.17 billion.
In its monthly status report to the Public Service Commission, Mississippi Power and its parent Southern Company said the additional costs are related to operational readiness, start-up activities, fuel and the completion of construction of the plant, including costs during start-up and commissioning.
The plant began operating on natural gas in August, and start-up of the coal gasification portion of the plant using lignite from the mine at the site is still expected during the first half of 2016.
Costs could continue to increase due to weather, labor costs and other factors, such as “unforeseen engineering or design problems” for this new technology, the company said.