Climate mitigation

Fuel Switching

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Definition

Fuel switching is the replacement of one energy source with another that has lower lifecycle greenhouse gas emissions, such as substituting natural gas, sustainable biomass, or renewable electricity for coal in power generation, industry, or heating. It is driven by carbon pricing, relative fuel prices, regulation, and technology availability.

References

HomaioGlossary: Fuel Switching (replacing carbon-intensive fuel with lower/zero-carbon alternative; coal→gas/biomass/renewable electricity; driven by carbon price, relative prices, policy)

definition and drivers

Overview

What it means

Because different fuels emit very different amounts of CO2 per unit of energy, switching can deliver immediate reductions without changing the underlying service provided. Coal-to-gas switching roughly halves emissions at the point of combustion, though methane leakage erodes the gain; switching to renewables or green hydrogen can approach zero. Switching is often a transitional step rather than an endpoint.

How it is used

Companies report fuel switching as an abatement lever in transition plans; modellers include it in mitigation pathways; and policymakers incentivise it through carbon prices, coal-to-clean programmes, and building-heat standards.

Why it matters

Fuel switching is one of the fastest ways to cut emissions in existing infrastructure, but choices made now — especially new gas assets — risk locking in emissions, making the direction and permanence of the switch critical.