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Electricity and gas tariffs for December 2025: offers, discounts and how to choose
December kicks off a new energy season. With the arrival of winter and the increased use of heating and lighting, it’s the perfect time to review your electricity tariff and make sure it matches your consumption habits. What's more, at Endesa, we're offering direct discounts and dual-tariff options you won't want to miss.
At Endesa, we always have the best alternatives to help you save on your electricity bill, and this month, we're bringing several promotions for new electricity and/or gas customers, plus three tariffs designed to fit your lifestyle: from stable 24-hour prices to automatic discounts during your peak consumption times.
Want to lower your electricity bill this December? Here's how to get it done:
Do electricity tariffs change in December?
While there’s no mandatory official review, many energy retailers update their prices or launch new promotions in winter. It’s a great time to review your contract, adjust your contracted power, and compare available tariffs —especially if your energy consumption increases as temperatures drop.
What are the cheapest electricity tariffs in December 2025? (Updated 3 December)
| Tariff | Price per kWh (avg.) | Key features |
|---|---|---|
| One Luz | €0.1039/kWh (20% discount) | Fixed 24-hour price, no commitment period, telephone support, as well as online (web and app). |
| One Gas | Variable term RL1: €0.0717/kWh (10% discount) | Tariff with no commitment period, Endesa's best price on your gas consumption, quick and easy online management. |
| One Luz + Gas |
Electricity: €0.1039/kWh Gas: Variable term RL1: €0.0638/kWh (20% discount) |
Combined electricity and gas tariff with stable pricing and no commitment. You can consolidate your bills and take advantage of online billing. |
| Conecta | €0.0949/kWh (fixed price 24/7) | A stable-price tariff with no penalties and 100% digital management. |
Remember:
- Prices shown do not include taxes (VAT, electricity tax, etc.).
- Endesa’s Conecta and One Luz + Gas Tariffs are exclusively for customers who do not currently have any active supply contracts with us.
- The One Gas Tariff is exclusively for customers who do not have gas contracted with Endesa, and for Endesa customers who want to change tariffs or register a new supply point.
Which electricity tariff should I choose in December?
This month we're bringing you three tariffs that include direct discounts, promotions for new electricity and/or gas customers, and points from our PARA TI loyalty programme, so you can have your home full of energy and your wallet relaxed, thanks to these exclusive (limited-time only) discounts:
- The One Luz tariff is the saving you deserve, offering a 10% indefinite discount and a 10% discount for 1 year. We will also maintain the base price for 2 years (barring an increase in the CPI and/or upward or downward changes to the regulated components). Also, for electricity-only contracts with a contracted power of no more than 15 kW, we guarantee you €50 in PARA TI points (equivalent to 5,000 points).
- One Gas is one of the most competitive natural gas tariffs on the market, offering you a 10% discount on the variable term (consumption) for 1 year on new contracts. Furthermore, if you sign up for gas only with RL1, RL2, and RL3 tariff groups, and satellite plant tariffs, you will get €50 in PARA TI points (equivalent to 5,000 points).
- With One Luz + Gas, you can stop worrying about the time of day you consume or what you pay each month. There will be no surprises on your bill, but there will be discounts and rewards. One Luz + Gas offers you a 20% discount on consumption for each energy type for 1 year, and also includes €100 in points for signing up for electricity and gas (equivalent to 10,000 points from the PARA TI loyalty programme), which can be redeemed for discounts on your electricity and/or gas bills.
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The most competitive tariff
If you’re looking for peace of mind and a highly competitive price, Endesa’s Conecta tariff is made for you. With a fixed price 24 hours a day, you can forget about surprises on your bill and enjoy the stability you need. No commitment, no fine print and fully online management through our website or app —so everything is quick and convenient. Because we know your time is valuable.
The Conecta Tariff is the perfect choice for anyone who wants to pay less and enjoy greater peace of mind, without complications.
How long do Endesa’s December offers last?
This month’s promotions for our One tariffs end on 15 December 2025. So don't wait any longer! Take advantage of the best offers this December, and sign up with Endesa!
Can I sign up for just electricity, or gas as well?
You can sign up for electricity, gas, or electricity and gas. If you sign up for the One Luz tariff, you'll get a 10% indefinite discount and a 10% discount for 1 year; if you prefer One Gas, you'll get a 10% discount on the variable term (consumption) for 1 year on new contracts; and if you want to combine electricity and gas, with our One Luz + Gas tariff, you'll get a 20% discount on consumption for each energy type for 1 year.
Tips to save on your electricity bill this December
- Use your heating in ECO mode and keep it at a moderate temperature.
- Take advantage of off-peak hours for laundry, cooking, or ironing.
- Review your contracted power—if it’s higher than you need, you’re paying too much.
- Consider no-commitment tariffs for greater flexibility.
FAQs – Electricity and gas tariffs in December 2025
When is the best time to switch tariffs?
December is usually a good time to switch your electricity tariff. It offers several advantages that make it an ideal opportunity to review your contract:
- As cold weather arrives, electricity consumption changes, so it might be the right time to adjust your tariff to your new habits after the summer break.
- Many companies launch winter promotions to attract new customers, like our December discounts on the One Luz, One Gas, and One Luz + Gas tariffs.
- Winter typically brings increased use of heating and climate-control systems, making December a perfect time to assess your tariff.
- If you opt for a fixed-rate tariff in December, it will help protect you from potential price rises in the winter months.
Taking advantage of these conditions can make a big difference on your bill.
What if I have a commitment period?
If your current tariff includes a commitment period, check the terms and conditions. Some penalties are low enough that switching could still save you money.
Which tariff is best if I have heating or air conditioning?
In this case, the Endesa Conecta Tariff is the best option. It's perfect for homes with air conditioning as it offers a stable price 24 hours a day, so you can use it whenever you need to without worrying about time bands.
What’s the difference between stable and time-of-use tariffs?
When choosing an electricity tariff, it’s important to understand how pricing is structured. At Endesa, you can go for a stable tariff (e.g., Endesa Conecta) or a time-of-use tariff (e.g., Tempo 3 Periodos). Both have advantages but are designed for different usage profiles.
- Stable tariff (Endesa Conecta): The price per kWh is fixed all day long, offering simplicity and predictability. You don’t need to watch the clock or change your habits. So, it’s ideal if you want a sense of security and full control over your bill. The drawback? You won’t benefit from lower off-peak pricing.
- Time-of-use tariff (Tempo 3 Periodos): Endesa’s Tempo 3 Periodos tariff is designed for those who can adapt their energy use to the times of day when electricity is cheaper. This tariff divides the day into three time bands: off-peak, shoulder, and peak hours. To make the most of it, it’s important to understand your energy habits and, if possible, shift some of your consumption to off-peak hours. This can result in significant savings on your monthly bill, especially if you use high-consumption appliances or have flexible schedules.
Expert opinion
At Endesa, we’re here to help you choose the tariff that best suits your needs. If you're looking for peace of mind, One Luz or One Luz + Gas are safe options. If you prefer to save at specific times of day, Tempo 3 Periodos offers flexibility and ongoing discounts. And if you only need gas, One Gas is an efficient solution.
And if what you want is a competitive price with zero hassle, then Conecta is your best ally: fixed price 24/7, no commitment and all your transactions online so everything is fast and easy. Ideal for those who value stability and convenience in their everyday life.
Still not sure? Our team of energy advisers is available to help you compare, understand, and choose the tariff that truly works best for you!