An inquest has been opened and adjourned into the death of a worker who fell into a water chamber at Connah's Quay power station on Deeside.
The power station overlooks the Flintshire Bridge
Michael Benn, 37, from Fife in Scotland, was pulled from the tank using specialist water rescue equipment at 1530 BST on Thursday.
He was treated at the scene but died shortly before arriving at Wrexham Maelor Hospital.
The Health and Safety Executive and North Wales Police are investigating.
A North Wales Police spokesman said: "Police are working closely with the Health and Safety Executive to establish the circumstances surrounding the death."
The North Wales Fire and Rescue Service were also called out to deal with the incident.
A post mortem examination was carried out on Friday.
Mr Benn was a contractor working at the plant, which is powered by gas from Liverpool Bay.
Plant owner E-On said the incident would not affect power supplies to the North West region.
A company spokesman said: "The contractor fell into a cooling chamber which is used to cool the water used at the site as part of the production process."