Easy Guide: How to understand your electricity bill in Spain

Receiving your first electricity bill in Spain  can be confusing. When you open it, you’ll likely find a document full of terms and numbers that aren’t always clearly explained, leaving you wondering if you are paying the correct amount.

If you have just set up your electricity supply for the first time or are used to an energy system outside Spain, it’s completely normal to ask yourself how to read your bill and what each line item actually means. In this sense, it is helpful to know the requirements and steps for signing up for electricity as an expat, especially if you have just moved to the country.

Let’s go through each section of your bill step by step so that, starting today, you know exactly what you are paying for and why.

What information you will find on an electricity bill

Although the layout may vary slightly depending on the energy supplier, all bills include the same main sections:

• Invoice details
• Contract and supply details
• Fixed charges (Power rating / Potencia)
• Energy consumption
• Taxes and regulated charges

Knowing each of these elements will help you accurately interpret any bill.

Invoice details

• Contracted product: The electricity tariff you have signed up for.
• Invoice number: The unique reference number assigned to your bill.
• Billing period: The exact start and end dates covered by the charge.
• Issue date: The date on which the bill was issued.
• Due date: The payment deadline. If you pay by direct debit, this is the day the charge will be processed by your bank.

The header: your personal and supply information

The first section identifies your contract and your supply point. It is important to review it to make sure all details are accurate.

What you should check:

• Supply holder: Your full name, or the legal company name if it is a business account.
• Supply address: The physical location where the electricity is consumed.
• Energy Supplier: The company you signed your contract with (e.g., Nordy).
• Distributor: The company responsible for the physical power grid in your area.
• Contract number: This code identifies your contract with your energy supplier and is the administrative reference you should always keep handy. It is the fastest way for customer support to locate your account, especially if you cannot find or remember your CUPS code.
• CUPS: The CUPS (Universal Supply Point Code) is the unique identifier for your electricity supply point. Unlike your contract number, it identifies the installation itself rather than your relationship with the supplier. You will need it for technical procedures such as changing your contracted power, registering a new connection, or requesting work on the electricity network.
• Billing period: Exact dates of the measured consumption.
• Charge date: The day the payment is collected.

This section is essential for any query or customer service request.

Fixed term or capacity charge

The power capacity charge is a fixed cost you pay for having access to electricity, regardless of how much energy you actually use. It is calculated based on your contracted power rating in kilowatts (kW).

Points to keep in mind:

• If you contract too much power, you will pay more on this fixed charge, but you will avoid tripping your main circuit breaker (ICP).
• If your contracted power is too low and you run several appliances at the same time, your electricity may cut out temporarily.

Practical example: In a small apartment with moderate consumption, a lower capacity will meet your daily needs without wasting money. In a larger home with many appliances, helps you avoid paying for more capacity than you actually need.

Electricity consumption: what you actually use

This block reflects the energy you have actually consumed and may vary depending on your chosen tariff.

What this section includes:

• Consumed energy (kWh): The amount of electricity used by your devices.
• Time-of-Use tariffs (Discriminación horaria): You will see your consumption broken down into different time slots (peak / punta, flat / llano, off-peak / valle), each with a different rate.

This is one of the main components of your electricity bill.

Meter reading: actual vs. estimated

Your consumption can be calculated in two ways:

• Actual reading: Directly measured data from your digital meter.
• Estimated reading: An approximate calculation.

If your bill includes an estimated reading, any difference will be automatically adjusted in your next statement.

Consumption details: active and reactive energy

• Active energy: The actual electricity you use day-to-day. This powers your household appliances and accounts for the main part of your bill.
• Reactive energy: A type of energy created by the operation of certain electrical equipment (like large motors or specialized machinery). It rarely affects standard residential homes, but can be relevant in commercial or industrial properties.

Taxes and regulated charges

Besides consumption and power capacity, your bill includes government-regulated costs that are standard across all energy providers in Spain:

• Transmission and distribution tolls: Fees for using the transport and distribution grid.
• Electrical system charges: Regulated fees that support the funding and maintenance of the national grid system.
• Meter rental: The cost for renting the digital metering equipment.
• Electricity Tax: Applied to the combined total of power capacity and energy consumed.
• VAT (IVA): Value Added Tax applied to the final bill total.

These charges do not depend on your energy supplier; they are set by national law and published in the Official State Gazette (BOE). They are supervised by the CNMC (Comisión Nacional de los Mercados y la Competencia) and the Ministry for the Ecological Transition. These charges are reviewed periodically to support the operation and maintenance of the electricity grid and to fund the national energy system. Because they are set by law, they apply equally to all energy suppliers in Spain.

Where your money goes

Some bills include a breakdown chart showing how the total amount you pay is distributed.

This breakdown gives you clear visibility into where your money goes.

Practical example of an energy bill with Nordy

To make things easy to understand, a typical bill includes:

• A clear summary with the final total to pay.
• A transparent split between power capacity and energy consumed.
• Details of the exact prices applied per unit.
• Clear information regarding the billing period.

At Nordy, our bills are designed to be simple and transparent, with all charges clearly broken down and no hidden fees or unnecessary extra services.

Practical tips after your first bill

1. Check your contracted power capacity: Adjust it if your main switch (ICP) trips frequently, or if you are paying for more power than you need.
2. Review your price per kWh: Make sure it matches your contracted rates.
3. Identify your consumption periods: On time-of-use rates, verify that your energy usage is properly allocated across off-peak, flat, and peak hours.
4. Keep your CUPS number safe: You will always need it for administrative changes, customer support, or switching services.

Use your bill to better manage your energy

Knowing how to read your electricity bill does more than just prevent surprises: it empowers you to check charges, optimize your power capacity, and better manage your overall usage.

At Nordy, in addition to providing fair and transparent rates, we guide you through the entire onboarding process:

• Plans tailored to your home or business: Apartments, villas, SMEs, or corporate groups.
• Multilingual customer support available in: Swedish, Norwegian, English, Spanish, and Catalan.
• Full control over your energy and bills: Continuous advice so you can manage your energy effortlessly.

Understanding your electricity bill makes it easier to manage your energy use and avoid unnecessary costs. If you're already a Nordy customer, we hope this guide helps you make the most of your service. If you're thinking about switching, explore our 100% renewable electricity plans and see how we can help you manage your energy with confidence.

Frequently Asked Questions About Your Electricity Bill

What is included in the total amount of my electricity bill?

The total amount includes several components: the cost of your contracted power capacity, the energy consumed, any requested additional services, regulated taxes, and the meter rental fee. All of these are summarized into a single final payment amount.

What is the difference between active energy and reactive energy?

Active energy is the electricity you actually consume in your daily life (lighting, appliances, electronics, etc.). Reactive energy is generated by certain types of electrical equipment, such as motors and transformers. It rarely affects residential customers and is mainly relevant for commercial or industrial installations.

How is energy consumption calculated on the bill?

It is measured by your digital meter and expressed in kilowatt-hours (kWh). On time-of-use plans, your consumption is divided into distinct periods (peak, flat, and off-peak), each billed at its respective unit price.

Why does my bill include charges that don't depend on my energy use?

In addition to actual consumption, every bill in Spain must include government-regulated costs, such as grid transmission tolls, system maintenance charges, meter rental, and taxes. These amounts are mandatory by law and do not depend on your chosen supplier.

Where can I check my hourly electricity consumption?

You can view a detailed, hour-by-hour analysis of your consumption by logging into the customer portal of your regional distributor (distribuidora). This information helps you analyze your daily routines within the billed period.

What is the difference between power capacity and consumption?

• Contracted Power Capacity (Potencia): A fixed cost you pay for having a specific limit of electricity instantly available, allowing you to run multiple devices at once.
• Energy Consumption (Consumo): The variable amount you pay based on the actual quantity of kWh used during the billing period.

Where does the electricity I consume come from?

Your bill may include a breakdown detailing the origin of your energy. This shows the percentage of electricity generated from renewable sources (solar, wind, hydro) compared to conventional sources. Knowing the origin helps you understand your environmental impact and choose more sustainable plans, such as the 100% renewable energy tariffs offered by Nordy.