The incident occurred at the hydrogen coolant circuit, when purging the hydrogen with carbon dioxide and air, aiming at finding a leak. Following a preliminary investigation, the power plant company explained that hydrogen was still present when air was injected, creating the condition for the formation of an explosive mixture. According to the sources referred to news mentioned in the References, it appears during the leak search activity, workers deviated from the established procedure.

A hydrogen-cooled electricity generator exploded inside a coal-fired power plant killing two workers and injuring fifty others. An investigation into the incident found that a hydrogen gas leak may have caused the explosion, which occurred as the generator was being tested following routine maintenance.A press release of the company (see references) immediately after the accident stated that their "safety procedures may not have been followed"

A hydrogen explosion occurred at a 585-MW coal-fired supercritical unit and caused one fatality, injuries to 10 other people, and significant damage to several buildings. The explosion occurred during a routine delivery of hydrogen when a hydrogen relief device failed, which allowed the contents of the hydrogen tank to escape and be ignited by an unknown source. The truck driver was delivering hydrogen gas to fill two 6500 cubic feet storage cylinders at the plant. The hydrogen gas was used to cool the generator at the power plant.