The Tennessee Valley Authority (TVA) has said that it is ‘experiencing challenges’ with the cost and schedule for completion of its Watts Bar 2 nuclear power plant. The revised completion date for the plant may extend beyond 2013 and the costs are expected to ‘significantly exceed’ TVA’s previous estimate of $2.5 billion.

In a filing to the Securities and Exchange commission TVA said that lower productivity has slowed the pace of construction at Watts Bar 2. TVA also said it anticipates regulatory considerations resulting from the US nuclear industry response to the Fukushima accident, as well as other causes, will result in additional costs being incurred.

TVA, which operates three nuclear power plants: Browns Ferry, Sequoyah and Watts Bar, decided to restart construction at Watts Bar 2 in 2007. It originally planned to finish the plant, which was 55% complete, within a five year window. Now, the completion date has been put back to 2013 and TVA says it is performing a root cause analysis to better understand the factors contributing to the project’s extended schedule and cost.

TVA that the delays to the completion of Watts Bar unit 2 may also affect the timing of the Bellefonte 1 completion. Construction is set to resume at Bellefonte 1 after initial fuel loading at Watts Bar 2.

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