Trafero
What is ERSE and what does it do for consumers
Guides

What is ERSE and what does it do for consumers

Published on October 16, 2026 · By Cristian Tanase

In short: ERSE is the Energy Services Regulatory Authority. It is the "referee" of the energy sector in Portugal.

Meet the body that oversees the energy sector in Portugal, sets network tariffs and protects consumers.

This is Part 8. We talked about regulated tariffs; who sets them?

Why do we need a referee?

Electricity generation and supply are open to competition. The transmission and distribution networks, however, are natural monopolies, which means it only makes sense to have one per area. With no competition to keep network prices in check, an independent body must do it. That is ERSE's role.

What does ERSE do?

  • Sets the network access tariffs that all suppliers pay.
  • Oversees the market so that rules are clear and companies are treated equally.
  • Protects consumers, for example on tariffs, prices and service quality.
  • Provides information and tools on its website to compare offers.

What rules must the sector follow?

Because electricity is an essential good, the sector has public service obligations: safe and regular supply, quality of service, connection of all customers to the grid and consumer protection. In return, everyone involved has the right to transparent rules, equal treatment and freedom to choose a supplier.

And what do I get from this?

You get the freedom to choose and to switch. See, in Part 9, how to do it at no cost.

Related

How the electricity market works in Portugal: a simple guide

From the sun and the wind to the socket at home: the steps that bring electricity to you, in plain words.

Where does electricity come from? Generation in Portugal explained

Sun, wind, water and gas: how the electricity you use every day is made, and what self-consumption means.

The electricity transmission network: what REN does

The motorways of electricity: how energy travels long distances and who makes sure the lights stay on.