The blackout that stopped Portugal: why energy autonomy can no longer wait

On 28 April 2025, a large part of Europe was plunged into darkness.

A continental-scale blackout affected Portugal, Spain, France and Germany, leaving millions of people without electricity for hours.

Homes, businesses and public services stopped. Many had no energy alternative.

In just a few hours, the event revealed a deep fragility: our total dependence on the electricity grid.

An increasingly vulnerable electricity grid

The April blackout was not an isolated episode.

Infrastructure failures, cyberattacks and peaks in energy demand are becoming increasingly common across Europe.

According to data from ENTSO-E, the European Network of Transmission System Operators for Electricity, there was a 27% increase in grid disturbance incidents in 2023 compared with the previous year.

In Portugal, the cause was attributed to an "interconnection failure in the very high voltage grid".

Although it was brought under control within a few hours, the incident had significant impacts:

• Hospitals activated emergency generators
• Production lines stopped
• IT systems failed
• Traffic lights and communications stopped working

The question is unavoidable: in a country with a strong commitment to renewable energy, how can we remain so vulnerable?

Solar energy does not automatically mean energy independence

Although Portugal already has more than 2 GW of installed photovoltaic capacity, most of these systems do not guarantee energy in the event of a grid failure.

Why?

Because most use conventional on-grid inverters, which depend on the electricity grid to operate.

When the grid fails, the system automatically shuts down, even in full daylight.

Having solar panels does not mean having energy during a blackout.

This is one of the most dangerous myths in the energy transition, because it creates a false sense of security.

The real solution: storage systems with full backup

To guarantee energy in any circumstance, a complete system must integrate:

• Local energy production through photovoltaic solar panels
• Battery storage sized to the installation
• A hybrid inverter with full backup capability, able to operate autonomously even without the electricity grid

This type of system works as an intelligent energy island, disconnecting from the public grid in milliseconds and supplying all loads through stored energy.

It is the difference between stopping and continuing.

Between loss and continuity.

Between vulnerability and resilience.

What does full backup mean in practice?

In systems with partial backup, only critical circuits, such as lighting or a refrigerator, remain active.

In a full backup system, the entire installation continues operating: from computers and climate control to water pumps, servers, industrial machines or electric vehicle chargers.

Enbiente sizes and installs solutions with reference brands such as Fronius, Enphase, FAAM, SMA and Victron, ensuring:

• Automatic and instant transition to backup mode
• Full autonomy in the event of grid failure
• Optimised solar self-consumption
• Intelligent battery charge and discharge management
• Personalised energy autonomy
• Specialised and continuous technical support

Yesterday's blackout is more than a warning

In a digital and connected world, energy means security and functionality.

Without energy, there is no remote work, no online sales and no electric mobility.

The April blackout was a clear warning for families, businesses and policymakers.

The trend is clear: blackouts will become more frequent, and solutions need to be more resilient.

The energy transition is not only about clean energy. It is about guaranteeing energy when and where it is needed.

Are you prepared for the next blackout?

Enbiente helps families, businesses and industries achieve true energy autonomy, with complete storage and full backup systems.

Do you want to know whether your installation is ready to withstand the next blackout?

Contact us.

The energy of the future starts now and does not go out.