Portugal's Energy Regulator Wants Every Household to Share Soaring Grid-Stabilisation Costs

The cost of keeping Portugal's electricity grid stable has quadrupled in three years, and the regulator now wants every household to help pay for it. In a proposal opened for public consultation this week, ERSE (Entidade Reguladora dos Serviços Energéticos, the Energy Services Regulatory Authority) revealed that the charges for the technical services that balance the grid in real time rose from €4.88 per megawatt-hour in 2023 to an average of €20.26 this year — a burden that, by the end of May, accounted for more than a quarter of the cost of electricity bought on the wholesale market.

Those "system services" are the unglamorous machinery that keeps the lights on: the reserves, frequency adjustments and technical restrictions that grid operator REN (Redes Energéticas Nacionais) calls on second by second to match supply with demand. Their cost peaked at €28.90 per megawatt-hour in February, after storm Kristin damaged infrastructure and the aftershocks of the April 2025 Iberian blackout continued to ripple through the system. ERSE describes the increase as showing "a structural upward trend" rather than a passing spike.

Why the bill keeps climbing

The regulator points squarely at the energy transition. As intermittent wind and solar take a larger share of generation, the grid needs ever more balancing to absorb the swings when clouds pass or the wind drops. That flexibility is expensive, and at present the cost falls disproportionately on companies and large consumers who buy directly on the wholesale market. ERSE argues this is neither fair nor sustainable, because the whole country benefits from a stable grid.

Its remedy is to spread the load. The regulator proposes shifting 40% of forecast technical-restriction charges onto the global system-use tariff — the component paid by essentially all consumers — phased in from the final quarter of 2026, beginning with a quarter of the costs. It would be paired with a reconfigured reserve market featuring a dedicated slot for conventional thermal plants, a new tradable risk-hedging mechanism, and a dynamic-management pilot run with REN. The net effect, if approved, is that ordinary households would see a small new element appear on their bills so that heavy market buyers pay relatively less.

What This Means for Expats

• Regulated-tariff customers could pay slightly more. If the reform passes, a share of grid-balancing costs migrates to the tariff most homes pay — a modest but structural addition to the electricity bill.
• The change starts in late 2026. The phase-in begins in the fourth quarter with a quarter of the costs, so any impact on domestic bills would be gradual rather than sudden.
• Renewables are the driver, not fuel prices. This increase reflects the cost of balancing a greener grid — a trend likely to persist as Portugal adds more wind and solar.
• Consultation is open. ERSE proposals go through public consultation, so the final split and timing may shift before they take effect.

For consumers already wary of energy costs after last year's blackout, the proposal is an awkward message: the price of a cleaner, more resilient grid is real, and someone has to carry it. ERSE's bet is that spreading a predictable charge thinly across millions of bills is fairer than leaving it concentrated on the market's biggest players — even if it means most households see one more line item creep upward.