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Founded in 1928, Summerleaze is a privately-owned company, whose origins are in the field of mineral extraction. The company has diversified substantially since then, into fields such as wastes management and renewable energy. Operating as a small, dedicated team, we aim to innovate to make the most of under-valued resources. We back ideas that we believe have a strong future on the basis of long-term fundamentals, regardless of, and often contrary to perceived wisdom or fashion.

SLZ logo

Gravel - the origin and core of the business.

Andigestion logo

Andigestion - recovery of energy and fertiliser from biodegradable waste.

Green Hydrogen logo

Green Hydrogen - sustainable gases for transport and industry

Forever Fuels logo

Forever Fuels - wood-pellet supply for renewable heating.

Summerleaze Mountains logo

Ernen - green, family-friendly tourism in the High Alps.