"While we are reducing coal in the Carolinas, we can't close a plant without a practical way to replace the electricity residents and businesses depend on," Culbert said.
Santee Cooper could be bought by other power companies in South Carolina.
The S&P 500 has returned 10% year to date, while the top half of it, around 16%.
Stock futures suggest the Dow Jones Industrial Average could dip below 22,000 when markets open Thursday.
The labor market goes under inspection and Apple releases its earnings report.