In a context where energy efficiency and household savings are becoming increasingly important, reviewing your contracted electricity capacity has become one of the easiest ways to lower your monthly bill.

Many households have contracted for more power than they actually need, which means they pay more than necessary each month, regardless of their actual electricity consumption.

In this article, we explain how much you can save by reducing your contracted power capacity, how to determine the right capacity for your home, and what steps you should take to optimize it without disrupting your daily routine.

What is contracted power?

The contracted power is the maximum amount of electricity you can use at any one time in your home. It is measured in kilowatts (kW) and determines how many appliances you can have running at the same time without tripping the power control switch (ICP).

Unlike energy consumption (kWh), which depends on how much electricity you use, the power charge is a fixed cost on your bill. In other words, you pay it every month even if you don’t use any electricity.

That’s why properly adjusting your contracted power is one of the most direct ways to reduce expenses without changing your consumption habits.

 

How much can you save by lowering the power setting?

The savings depend on several factors, but generally speaking, reducing your contracted power can result in significant annual savings.

In Spain, the annual capacity charge is typically between 30 and 50 euros per contracted kW (depending on the rate plan and electricity provider).

Practical example

Let’s imagine a home with a contracted power of 5.75 kW:

• Approximate annual cost: between €170 and €290

If it is reduced to 4.6 kW:

• Approximate annual cost: between €140 and €230

-Estimated savings: between €30 and €60 per year

If the reduction is greater (for example, from 6.9 kW to 4.6 kW), the savings could exceed €100 per year.

Although it may seem like a modest amount, it represents consistent savings, without the need to change habits or make any investments.

Why do many homes have more power than they need?

It is quite common for homes to have a higher electricity capacity than they actually need. This can be due to several reasons:

• Standard initial contracts without a real analysis of consumption
• Changes in Ownership Without a Power Rating Review
• Fear that “the fuses will blow”
• Gradual adoption of more energy-efficient appliances over time

Over the years, homes have become more energy-efficient, making it possible to reduce power consumption without compromising comfort.

 

How do you know how much power you need?

Setting the power correctly is key to saving money without compromising daily use of the home.

To calculate the appropriate power, you should consider the following:

• Number of household appliances

The more devices you use at the same time, the more power you’ll need.

For example:

• Oven
• Washing Machine
• Dishwasher
• Air Conditioning
• Glass-Ceramic Cooktop

 

• Consumption Habits

A home where several appliances are used at the same time is not the same as one where their use is more staggered.

 

• Size of the home

Larger homes tend to have more electrical equipment, although this does not always mean higher power consumption if the equipment is used efficiently.

 

• Type of installation

Modern homes are generally better equipped to optimize energy consumption, which allows for more precise power adjustments.

 

Typical power ratings for a home

As a general reference:

• 3.45 kW → small homes or homes with low energy consumption
• 4.6 kW → average homes with standard usage
• 5.75 kW → homes with more electrical equipment
• More than 6.9 kW → large homes or homes with high simultaneous energy consumption

In many cases, 4.6 kW of power is sufficient for an average household if the use of appliances is managed properly.

 

Step-by-Step Guide to Reducing Your Contracted Power Capacity

Reducing your power capacity is a simple process that you can do through your electricity provider.

1. Analyze Your Current Usage

Check your bills or use online tools to understand your actual usage.

2. Calculate the required power

You can use power calculators or consult a professional to estimate the optimal power.

3. Request the change

Contact your electricity provider and request a reduction in your power rating. There is usually a small administrative fee for this process.

4. Check that it works

Once the adjustment has been made, wait a few days to see if you can use your appliances as usual.

What happens if you turn the power down too much?

The main risk of reducing the power too much is that the circuit breaker will trip when you use several appliances at the same time.

However, this isn’t a serious problem. You’ll simply have to:

• Reduce simultaneous use
• Adjust Your Habits
• Or increase the power again (although this comes at a cost)

For this reason, it is advisable to make gradual adjustments.

 

Tips for Optimizing Power Usage

To make the most of lower power, you can follow these best practices:

• Avoid using high-energy-consumption appliances at the same time
• Schedule washing machines or dishwashers for different times
• Use energy-efficient appliances
• Leveraging Equipment Scheduling

Small changes can make a big difference in a home’s energy efficiency.

 

The Role of Energy-Efficient Homes

Newly built homes are increasingly designed to optimize energy consumption.

This includes:

• Best Insulation
• Efficient HVAC Systems
• Energy-efficient appliances
• Energy-efficient design

All of this makes it easier to adjust your contracted power without compromising comfort.

 

Beyond Savings: Efficiency and Sustainability

Reducing contracted power capacity has not only an economic impact but also an environmental one.

More efficient energy use helps reduce electricity demand and, therefore, the associated environmental impact.

Every small step counts in the transition to a more sustainable energy model.

 

Start saving from home

Checking your contracted power is a simple, quick step that has a direct impact on your household budget.

It is one of the first steps toward optimizing a home’s energy consumption and moving toward a more energy-efficient home.

 

Discover more tips for saving money on your home

If you’d like to learn more ways to reduce energy consumption and improve your home’s energy efficiency, check out this practical guide:

Culmia’s Guide to Saving Money at Home: https://www.culmia.com/wp-content/uploads/2025/08/guia-para-ahorrar-en-casa.pdf