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Unless purchased from a renewable-specific energy supplier, electric oven use will result in emissions roughly equivalent to a gas oven because ~50% of UK electricity comes from gas/coal/oil and generation efficiencies are ~50% or so.
Either way, we don't have a beefy enough electricity transmission network to enable everyone to switch to electric ovens/heating. Our electric network is near capacity already. But we do have a gas pipe network which can transfer >5x the energy. If only we didn't have to put fossil fuels in these pipes! Hydrogen gas made by renewable-fed electrolysis (or SMR with CCS) could be an answer but we're 10+ years off.
TL;DR: Gas ovens are, at present, no worse than electric ovens.
Ndeipi
Dramatic_Hammer
Fossil fuels aren't really the vibe these days.