Manx Utilities Authority has been fined £17,000 for one offence under the Health and Safety at Work Act.
The authority pleaded guilty to failing to discharge its duty after a worker was killed when a wall collapsed in December 2012.
The charge related to the death of 52-year-old John Lawrence Gell, known as ‘Lude’, who died whilst carrying out excavation work to replace a water pipe in Peel.
Mr Gell was working with three others in a public footpath, near Marine Parade, Peel, when without warning the wall fell on top of him.
An inquest into Mr Gell’s death in 2013 recorded a verdict of accidental death.