After the increase of the rates during the summer, and before having to reignite the heating, the return is the ideal period to change supplier of gas or electricity.

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Back to school is an opportunity to change energy suppliers if you find that yours starts to weigh heavily on your budget. With soaring prices since the beginning of the summer - almost 9% increase in the regulated electricity rate - and the coming autumn, when we turn on the heat again, it's a good time to watch what does the competition do? In some cases, changing the operator saves up to 200 euros over one year. But not all alternative providers are equal. Europe 1 reviews the pitfalls to avoid in order to be sure to optimize your bill.

Whether it's an electricity or gas supplier, to ensure you get the best deal, you can do an online simulation on the National Energy Ombudsman's website. With more than 30 electricity suppliers on the market, this tool gives you a first idea.

A golden rule to follow: opt for an offer with a fixed price, which will avoid the unpleasant surprises of the offers indexed on the regulated tariff, which have only increased in recent years.

Discounts ... usually very partial

Also be wary of too tempting offers, which show percentages of reduction. "With offers at -10% or -12%, the consumer should not think that this percentage reduction concerns the entire bill.An energy bill is a third of consumption, a third of the subscription and a third of taxes.The reduction percentage is only for one of these thirds, "warns Cédric Musso, energy specialist at the UFC-Que Choisir.

And finally, note that switching providers is free, and can be done at any time. You do not have to wait for the anniversary date of your contract. Above all, it is up to your new supplier to take care of all the steps.