Georgia Power issued a release on Thursday saying that the blast at Plant Bowen last month was caused by a worker’s error and not an equipment failure. The company` s internal investigation said that a worker did not comply with procedures nor communicate property. The company added that the employee’s mistake caused a combustible mix of hydrogen and air to get inside a generator.

The investigation is ongoing and the employee has to be disciplined.

An operational and cultural assessment at the plant is currently being conducted.

Currently only half of the plant’s units are producing electricity.

OSHA, which has six months to complete its investigation, is still looking into the blast and has not yet released any findings.