Entrepreneur UK’s London 100: tem Energy

tem Energy is revolutionizing renewable energy trading by cutting costs and inefficiencies, helping businesses save money while accelerating the UK’s green energy transition

By Patricia Cullen | Jun 05, 2025
tem Energy
tem Energy founder, JoeMcDonald

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Industry: Energy

tem Energy is a fast-growing startup co-founded by Joe McDonald, transforming how businesses buy and sell renewable energy.

By streamlining energy transactions, tem has already saved businesses £5.7m, eliminated 5,081 tons of CO2, and returned £6.25m to renewable energy generators. Their platform cuts out inefficiencies and costly middlemen, reducing transaction fees by £11.3m, and ensuring both businesses and green energy producers benefit.

This model directly supports the UK’s shift toward a decentralised, sustainable energy system. With a rapidly expanding client base and rising transaction volumes, tem is positioning itself as a major player in reshaping the UK energy market.

By making renewable energy more accessible and cost-effective, it’s not just saving money – it’s driving the future of clean energy adoption.

Industry: Energy

tem Energy is a fast-growing startup co-founded by Joe McDonald, transforming how businesses buy and sell renewable energy.

By streamlining energy transactions, tem has already saved businesses £5.7m, eliminated 5,081 tons of CO2, and returned £6.25m to renewable energy generators. Their platform cuts out inefficiencies and costly middlemen, reducing transaction fees by £11.3m, and ensuring both businesses and green energy producers benefit.

This model directly supports the UK’s shift toward a decentralised, sustainable energy system. With a rapidly expanding client base and rising transaction volumes, tem is positioning itself as a major player in reshaping the UK energy market.

By making renewable energy more accessible and cost-effective, it’s not just saving money – it’s driving the future of clean energy adoption.

Patricia Cullen

Entrepreneur Staff

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