"We have a few more ideas in mind," Chief Executive Georg Mueller said during the group's annual press conference, but cautioned that nothing would materialise in the short-term.

The latest investment brings MVV's spending on Britain to more than 500 million euros following the construction of an energy from waste plant in Plymouth and a biomass site at Ridham Dock in recent years.

Mueller said the country remained open to foreign investments even after a landmark vote to leave the European Union, saying its business there was based on contracts and relationships of trust.

(Reporting by Christoph Steitz, editing by Emma Thomasson)