When Will Smart Electricity Tariffs Arrive in Portugal? What ERSE’s Plans Mean for Homeowners

Portugal has become one of Europe’s leaders in renewable electricity, with solar capacity expanding rapidly across the country. Yet the way electricity is priced for households has barely changed in decades. Most homes still pay for electricity using simple flat tariffs or fixed time-of-use tariffs (bi-horário or tri-horário).  That is about to change.

Portugal’s energy regulator, ERSE (Entidade Reguladora dos Serviços Energéticos), has begun the process that will eventually lead to “smart tariffs” electricity pricing that reflects real-time grid conditions and renewable energy availability.

Here’s what is happening, when it will happen, and why it matters for homeowners considering solar and batteries.

Portugal’s Electricity Tariffs Are About to Change

Portugal currently uses a simple time-of-use system:

    •    Single tariff: same price all day
    •    Bi-horário: peak and off-peak periods
    •    Tri-horário: peak, shoulder and off-peak periods

These schedules were designed many years ago when electricity demand patterns were very different. Today the grid looks completely different.

Portugal now has:

    •    Rapidly growing solar generation
    •    Increasing electric vehicle charging
    •    More distributed rooftop solar systems
    •    Smart meters installed in most homes

Because of this, the existing tariff structure no longer reflects how electricity is actually produced and consumed.

ERSE’s Consultation on New Tariff Periods

In late 2025, ERSE launched a public consultation to update the time periods used in electricity tariffs in mainland Portugal.

The goal is to redesign tariff periods so they better match the modern electricity system, particularly the rise of solar power.

The consultation process ran through January 2026, with responses from:

    •    electricity suppliers
    •    consumer organizations
    •    grid operators
    •    energy experts

However, even after the consultation finishes, the new tariff structure will not be implemented immediately.

ERSE has indicated that the earliest implementation date will be January 2027.

Why Smart Tariffs Are Coming

Three major changes in Portugal’s energy system are pushing this reform.

1. Solar energy is changing the grid

Portugal has experienced an explosion in solar generation, both utility-scale and residential.

During sunny days, the grid increasingly experiences midday electricity abundance, meaning power is plentiful and cheaper to produce.

Smart tariffs allow electricity prices to reflect this reality.

2. Smart meters are now widespread

Portugal has nearly completed the rollout of smart electricity meters across the country.

These meters:

    •    measure electricity usage hourly (or more frequently)
    •    allow remote readings
    •    enable more advanced billing structures

Without smart meters, dynamic electricity pricing would be impossible.

3. Europe is pushing dynamic pricing

Under EU electricity market rules, member states are encouraged to allow dynamic pricing contracts linked to wholesale electricity markets.

These tariffs change hourly based on electricity prices in the wholesale market.

Some Portuguese suppliers already offer these products, but they remain niche.

The ERSE reforms are designed to make the system ready for broader adoption of dynamic tariffs.

What Smart Tariffs Will Likely Look Like

Portugal’s first step is not full real-time pricing, but rather updated time-of-use periods.

These will likely better reflect the modern grid, meaning:

    •    Cheaper electricity during solar hours
    •    Higher prices during evening peaks
    •    More incentive to shift consumption

Eventually, suppliers may offer fully dynamic tariffs, where electricity prices change hourly based on the wholesale market.

What This Means for Solar Homeowners

For households considering solar panels, these changes are important.

Smart tariffs could significantly affect how solar systems are designed and used.

Midday electricity may become cheaper.

As solar production increases across Portugal, wholesale electricity prices often drop during sunny periods.

Dynamic tariffs could reflect this, reducing the value of exporting solar power to the grid.

Batteries become more valuable

If evening electricity becomes more expensive, batteries allow households to:

    •    store cheap solar power during the day
    •    use it during expensive evening peak hours

This significantly improves the economics of residential battery systems.

Smart consumption will save money

Households will increasingly benefit from shifting electricity use to cheaper periods.

Examples include:

    •    charging electric vehicles midday
    •    running heat pumps during solar hours
    •    scheduling appliances during off-peak periods

The Timeline for Smart Tariffs in Portugal

Based on ERSE’s consultation process, the expected timeline looks like this:

2025 - 2026: Public consultation and regulatory design.

2026: Final decision on new tariff structures.

January 2027 (earliest): Implementation of updated tariff time periods.

2027 - 2028: Potential expansion of dynamic tariffs and broader market adoption.

A Major Shift in How Electricity Is Priced

Portugal’s electricity system is evolving quickly as renewable energy becomes dominant.

Updating tariff structures is a necessary step to ensure that:

    •    electricity prices reflect real supply and demand
    •    consumers are incentivized to use energy more efficiently
    •    the grid can integrate more solar and wind power.

For homeowners, particularly those considering solar panels or batteries, the next few years will bring new opportunities to optimize energy usage and reduce electricity costs.

If you live in Portugal and are considering installing solar panels, understanding these upcoming tariff changes can help you design a system that will perform well under the future energy market.

You can learn more about solar installation and system design at www.solviva.biz.