REN's April 2026 Balance Shows 60% Renewables Inside a 30.9% Hydro Collapse — Wind Carries 19% and Solar 14% as Natural Gas Output Jumps 66.6% to Cover the Hydric Gap, Net Imports Print at 26% of Consumption

The Redes Energéticas Nacionais April 2026 monthly balance, published this week on the REN Data Hub, reads as a structural snapshot of Portugal's grid asymmetry: a high renewable share on paper, but inside a year-on-year collapse of renewable output that left the system leaning on natural gas and imports to keep the lights on. The headline number — 60% renewable coverage of consumption — sits 16 percentage points below the same month in 2025, when hydro reservoirs were near-full and wind output unusually high.

The composition

Hydroelectric production covered 22% of consumption in April 2026 — but in absolute terms, hydro output fell 49.3% year-on-year, the steepest April hydro contraction REN has recorded since the 2017 drought cycle. The April hydric index sat well below the historical median, with reservoir levels approaching half-fill by month-end. Wind covered 19% of consumption, solar 14%, biomass 6%. Solar was the standout positive print: photovoltaic output rose 37.4% year-on-year, reflecting the new capacity that came online through late 2025 and the first quarter of 2026. Installed solar capacity sits at 4,994 MW; wind at 5,456 MW; hydro at 8,385 MW; biomass at 687 MW; natural gas at 4,356 MW.

The natural-gas backstop

Where renewables fell short, the gas turbines fired. Natural-gas-fired generation jumped 66.6% year-on-year in April, reflecting the gap left by the hydro collapse. Combined-cycle plants in Tapada do Outeiro and Lares ran at materially higher capacity factors than they did in April 2025, when surplus hydro made gas-fired generation the marginal — and rarely-dispatched — technology. The April 2026 print is the practical illustration of why Portugal's gas fleet has not been retired even as renewable capacity has expanded: it is the dispatchable backstop when hydric conditions turn against the system.

Imports at 26%

Net imports from the Iberian interconnections covered 26% of April consumption — Portugal was an electricity importer for the month at scale, leaning on Spanish supply through MIBEL. The import balance is partly a function of MIBEL price economics — Iberian wholesale prices have been depressed by Spanish wind and solar overcapacity — but it also reflects the structural reality that Portuguese consumption has been growing faster than domestic generation capacity. Total consumption hit 4,086 GWh in April, up 2.4% year-on-year (1.7% adjusted for temperature and working-day effects). The monthly peak was 7,860 MW on 13 April at 20:30.

The year-to-date picture

The headline year-to-date numbers tell a more flattering story: through April, 76% of consumption has been covered by renewable production. The breakdown for Jan-Apr 2026 is hydro 34%, wind 29%, solar 8%, biomass 5%. Cumulative consumption sat at 18,711 GWh, up 3.5% on the same period of 2025. Renewable production, however, was down 4.7% year-on-year. The renewable share holds up because total consumption is rising faster than renewable contraction — not because renewable absolute output is growing. That distinction matters for any reader trying to read the grid story from a single headline percentage.

The Q1 2026 renewable read at 78.5% placed Portugal third in the EU for renewable electricity penetration, behind only Austria and Norway-adjacent Nordic systems. The April read at 60% does not reset that ranking — Portugal will likely still finish 2026 in the top five — but it does illustrate the volatility of a grid still dependent on hydroelectric output that swings with the weather.

The capacity build-out

The April 2025 print at 90% renewable coverage was an outlier driven by hydric conditions. The April 2026 print at 60% is closer to the structural median for an April with subnormal precipitation. The medium-term direction of travel sits inside the PRR-anchored capacity programme that targets the connected solar fleet at 7-8 GW by 2027 and the offshore wind tender — still bottlenecked at the Direção-Geral de Energia e Geologia approvals stage — at 2 GW by 2030. The 4,994 MW solar print at April-end was up from 4,346 MW twelve months earlier; the trajectory is on plan, but the pace lags the consumption growth that 2.4% YoY April reading captures.

What this means for expats

• Electricity prices: a 26% import balance ties Portuguese consumer prices more tightly to Spanish wholesale conditions. The recent MIBEL run of low spot prices has flowed through to ERSE's regulated tariffs, but a 2026 dry year would compress that cushion.
• Solar self-consumption: the +37.4% solar output figure reflects new utility-scale connections — but for households, the autoconsumo regime continues to be the fastest payback in residential energy. April-May is the cleanest financial window of the year for installations.
• Heating and cooling cost outlook: the structural dependence on hydric output means a dry summer can shift the merit order toward gas-fired generation. ERSE's tariff structure smooths some of that, but commercial users on indexed contracts should expect more volatility through Q3.
• Carbon intensity of consumption: the April 60% renewable share remains well above the EU average. For corporates running Scope 2 inventories, Portuguese electricity remains one of the cleanest grid mixes in Western Europe — but the year-on-year drop in renewable output is material for any reader running a 12-month rolling carbon-intensity calculation.
• Grid resilience: the gas backstop did what it was supposed to do in April. The lesson for policy is that closing combined-cycle capacity ahead of utility-scale storage build-out would tighten resilience margins — and ERSE's storage tenders, slow to clear, are the binding constraint on that transition.

REN publishes the May 2026 balance in mid-June. The hydric situation through May has been mixed, with mid-month rainfall in the Douro and Tejo basins partly recovering reservoir storage. The natural-gas spike of April may not repeat at the same magnitude — but the structural takeaway from the April balance is that Portugal's renewable share is still tethered, in the short run, to whether the dams are full.