This incident occurred at the electrolyzer of a refuelling station. An employee of the electrolyzers manufacturer was on-site to conduct a reset of the plant power breaker system and to restart gas generation. Whilst putting the system into generation, a loud bang was heard. By reviewing the station CCTV evidence, a cloud of water vapour was seen being emitted from the oxygen vent line of the electrolyzer container. The gas generation system was safely shut down, and an investigation was started to understand the cause and potential impacts.

This incident occurred when subcontractor two workers were widening air vents on the roof of a building hosting a tank containing hydrogen chloride solution. This intervention was necessary to to improve hydrogen venting from the tank storage area. The hydrogen gas was a by-product of the chlorine-making process. The two workers were operating an angle grinder, producing sparks which ignited the flammable atmosphere which evidently containing hydrogen. An explosion followed, with one casualty and one injured worker.

During the shipments of incinerator bottom ash, flammable gasses including hydrogen generated and caused two explosions. The first explosion was in the forecastle store and the second in the cargo hold.The vessel was loaded with a cargo of 2333 tonnes of unprocessed incinerator bottom ash. The chief engineer, who was inside the forecastle store at the time, suffered second degree burns and was airlifted to a nearby hospital.

Hydrogen leak due to a fault with non-process related battery equipment.After reporting the hydrogen leak, fire crews have been called to a gas terminal. The leak was due to a fault with non-process related battery equipment.

A lorry loaded with gaseous hydrogen cylinders caught fire and shut a motorway.No one has been injured.

The explosion was followed by a fire. Eyewitnesses reported seeing a "huge gush of fire". The local fire and rescue team brought the fire under control.According to the company, the explosion was caused by a problem with a pipe that led to a fire involving a mixture of gases including hydrogen, nitrogen and ammonia. The two injured members of staff were treated for shock.

The hydrogen leak occurred on a lorry travelling on a motorway. According to Highways England the vehicle was carrying nine cylinders of gas, one of which had a crack and was leaking. The only way to allow it to safely disperse was to let it vent.An exclusion zone was set up around it and the road closed. The incident led to delays of up to 90 minutes during rush hour.

A hydrogen and batteries driven aircraft was forced to land after a flight incident. According to the aircraft company the aircraft was forced to an emergency landing, but landed normally on its wheels in a flat grass field and almost came to a stop, but was damaged as it caught the left main gear and wing in the uneven terrain at the end of the field at low speed.According to the sources, the flight conformed to the approved test route over the airport, and that the aircraft structural integrity was maintained throughout the incident sequence.

The event occurred in a bus garage when carrying out the purging process of the hydrogen cylinders. This process was executed via an electronic control system, but it was found that one cylinder solenoid valve was mechanically stuck. In these cases, the valve manufacturer has foreseen an alternative manual process using an override tool. The process was executed according to manufacturers instruction, but the valve did not start to evacuate hydrogen when expected. The fuel cell engineer tried to rectify the problem and started removing the override tool, but forgot to unwind the stem.

A hydrogen and fuel cells bus experienced a hydrogen detection alarm in a city centre. This triggered the evacuation of the immediate surroundings and the towing of the vehicle to the maintenance garage.