Stagecoach reduces 61,000 metric tons of CO2 with Dieselite biodiesel blends

Photo: Stagecoach

U.K.-based biodiesel producer Argent Energy supplied its Dieselite brand of higher biodiesel blends to Stagecoach throughout 2025.

By using Dieselite, Stagecoach has achieved a significant reduction in greenhouse-gas emissions across its bus fleet.  

During the year, Stagecoach achieved an annual CO2 reduction of 61,261 metric tons compared with standard fossil diesel.

The savings were achieved across 7,000 buses in 18 regions.

Argent Energy entered into a fuel supply agreement with Stagecoach to support the transition of its diesel-powered fleet to a higher biodiesel blend.

Dieselite is now supplied across 108 depots in England, Scotland and Wales, forming part of Stagecoach’s wider decarbonization strategy.

Stagecoach’s example of defossilizing its diesel fleet while continuing to introduce electric vehicles across its network means real and immediate carbon savings.

And these come from their existing diesel vehicles, without the need for modifications.

Dieselite goes beyond the bio content of the U.K.’s standard diesel of a maximum of 7 percent, which is often much less.

The biodiesel component in the fuel is produced from 100 percent certified end-of-life waste, with greenhouse-gas savings calculated on a well-to-wheels basis.

This approach enables operators to reduce emissions using existing infrastructure and vehicles, providing a practical and cost-effective solution during the transition to zero-emission transport.

“Our aim is to decarbonize our business, with fleet electrification being the goal, but this transition takes time,” said Greg Ritt, Stagecoach’s group head of sustainability. “That’s where biofuel becomes our bridge. Sustainable change requires systems thinking and key to that is collaboration with stakeholders. Working with Argent Energy, Dieselite helps us cut emissions quickly while planning long‑term EV investment.”

Dickon Posnett, Argent Energy’s corporate-affairs director, added, “This collaboration demonstrates how renewable fuels such as Dieselite can achieve real, measurable reductions in carbon emissions now. We fully support net-zero ambitions but, like Stagecoach, we want to see any diesel-engined vehicles on the roads over the next years or decades to be using the maximum amount of renewable fuel and reducing emissions, without it costing more than normal diesel.”