BORD na Mona has begun dying its diesel in an effort to combat the widespread theft of fuel from its vehicles and depots.
Bord na Mona head of fuels Paul Riordan estimates around 80 or 90 thefts took place this year alone.
He said: "It's everywhere. We are leaving a lot of machines empty now. We are coming up to Christmas and the vast bulk of machines will be left empty."
Due to the nature of its business, Bord na Mona operates in a number of rural locations, which are prime targets for fuel thieves.
Earlier this year, the state agency, with the assistance of the gardai, approached the Revenue Commissioners and secured approval from Customs to place purple/blue markers in its diesel.