The best electricity and gas tariffs – September 2025: Which one fits your back-to-routine lifestyle?

Remember:

• Prices shown do not include taxes (VAT, electricity tax, etc.).
  
  
• Dual Online and One Electricity + Gas are only available to new Endesa customers.
• Dual Online includes an extra 10% gas discount for one year.
• Tu Casa 50 includes an extra 10% discount when contracted by new customers.
• You can also earn points thanks to the PARA TI loyalty programme, which can be exchanged for direct discounts on your bills, and enjoy many more advantages.

Save more with PARA TI: Loyalty points that turn into direct discounts

In addition to choosing the tariff that best fits your household, you can now earn points with Endesa’s PARA TI loyalty programme. These points can be redeemed for direct discounts on your electricity bill and give you access to even more advantages.

For example:

• With Tu Casa 50, you earn points worth €100 in direct discounts.
• With One Luz, you get €70 in savings through points.
• With Conecta Luz, you get points that translate into €140 off your bill.

And if you choose a gas tariff...

• With Gas Endesa or One Gas, you earn points worth €60 in direct discounts on your bill.

If you sign up for electricity and gas:

• Sign up for the Endesa Dual Online Tariff and receive €200 in direct discounts on your bills by using points from the PARA TI programme.

A simple way to reward your commitment to energy efficiency! Because saving should also be rewarded.

Which electricity tariff should I choose this September?

Let’s explore three different scenarios:

• If you spend most of the day at home, especially during the hottest hours, and rely heavily on air conditioning:
   Dual Online de Endesa tariff is your best option. Its stable 24/7 price lets you use your appliances and gas without worrying about time-of-use charges or unexpected bill spikes.
• If your home typically has constant electricity and gas consumption and you can't define your peak usage hours, then the One Luz + Gas tariff is your best option, thanks to its fixed price 24 hours a day, with no time-of-day variations.
• If you’re looking for a plan with extra benefits: The Tu Casa 50 tariff rewards your loyalty. In addition to the hourly discounts, you’ll get extra savings for keeping the tariff for one year. Perfect if you want stability and better returns in the medium term!

Fixed or time-of-use tariff: Which works best in September?

If you prefer stability and want to avoid surprises during the back-to-school rush, a fixed-rate tariff can give you peace of mind, like Endesa's Dual Online, One Luz + Gas, Única, and Tu Casa 50 tariffs. When you have high-consumption appliances, or children at home who use more electricity and gas at peak times, a fixed-rate tariff is the best option to protect yourself from price increases.

A variable-rate tariff, like those offered by Endesa: One Luz 3 Periodos and Tu Casa 50 – 12 meses, can help you save if you are able to adapt your consumption. This includes using appliances at night, turning off lights and electrical devices that are not in use, and making children aware of energy-saving habits (turning off the tap, switching off lights when leaving a room, and not leaving chargers plugged in, among others).

Tips to save on your bill this September

• Use your AC in ‘ECO’ mode and set it to 24°C.
• Take advantage of off-peak hours for laundry, cooking, or ironing.
• Review your contracted power —if it’s higher than you need, you’re overpaying.
• Sign up for a tariff with automatic discounts like Tu Casa 50 or its 12-month version.

Expert opinion on electricity and gas tariffs

At Endesa, we’re here to help you choose the tariff that best suits your needs.

Tariffs with automatic discounts, like Tu Casa 50, are an excellent option for those who concentrate their consumption at specific times of the day. If you prefer peace of mind and predictability, the Dual Online and One Luz + Gas tariffs offer you a stable price 24 hours a day. And if you’re open to a one-year contract, Tu Casa 50 rewards you with an additional 30% savings on your peak consumption hours.

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!

FAQs – Electricity and gas tariffs in September 2025

When is the best time to switch electricity or gas tariffs?

September is one of the best months to review your energy tariff. Habits change with the season: earlier lighting, heating starting, and more time at home. If your bill is rising or your tariff no longer suits you, consider Conecta Luz for a stable price or the Dual Online Tariff to simplify your energy management with one dual tariff.

What’s the best tariff if I work from home some days but not others? (Electricity and heating)

If you have a mix of days at home and days away, you need a flexible tariff that fits your lifestyle. Tu Casa 50 may be the best option: It refunds 50% of electricity consumed during two hours a day, perfect for hybrid routines. This way, if you work from home on Tuesdays and Thursdays, you can use your heating, computer, and appliances during those hours to save money easily! If you also use gas for heating, One Luz + Gas bundles everything into one competitive plan.

What if I use the oven, dishwasher, heating, and dryer every day?

For high and constant energy use, stability is your best bet. Conecta Luz ensures a fixed price 24/7, so you can use appliances whenever you need. This lets you use your appliances when you need them, without worrying about time-of-use periods or price peaks. If you also use gas for heating or hot water, the Dual Online Tariff lets you combine both supplies under one plan with great benefits and easier management.

Can I save if I have an EV and gas heating?

Yes. September is a transitional month for energy, with sunny hours still available for charging your car and heating use starting to increase. If you charge your electric vehicle at night, Tu Casa 50 allows you to schedule two hours of discounted energy, ideal for off-peak hours. And if your heating is gas, One Luz + Gas provides a complete solution with both electricity and gas in one tariff, designed for those who have an EV and want efficient heating.

What if I have a contract with permanence?

That will depend on your current contract. Some tariffs have a fixed term, while others are more flexible. For instance, Endesa's Conecta Luz, Dual Online, and One Luz + Gas tariffs have no fixed term, giving you the freedom to switch whenever you want. If you are considering a change, check your current contract or contact customer service for details. The potential savings might be worth the penalty, especially if your consumption or lifestyle has changed.

What’s the difference between fixed 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., Tu Casa 50). 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 clear control over your bill. The drawback? You won’t benefit from lower off-peak pricing.

• Time-of-use tariff (Tu Casa 50):

The price changes depending on when you consume energy. In this case, a 50% discount is automatically applied to your 50 peak usage hours each month. This allows for significant savings if you concentrate your consumption at certain times. Key aspects to consider: You need to know your energy habits to make the most of it.