We've found that it's nearly always more cost-effective to find the best priced electricity and gas plans separately, rather than looking only at the 'dual fuel' plans that some retailers offer.
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In practice, a 'dual fuel' electricity + gas plan usually means only that an additional incremental conditional discount will be applied to the electricity bill. You'll usually still receive separate bills on different billing cycles – monthly or quarterly for electricity, and bi-monthly for gas.
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For these reasons, Bill Hero treats gas as a completely separate subscription.