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If I already have a night tariff such as One or Tempo Nocturna, should I switch to the Happy tariff?


It depends on your consumption habits.
If you use a lot of electricity over just a few hours, you may well pay less with the Happy tariff. If you need electricity over many hours in the off-peak period (for example, because you have a storage heater), the night tariff might be better for you.
In any case, you can try out the Tempo Happy tariff and, as you’re not tied in, you can switch back to the night tariff if you want.

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