Portugal Imported 36 Percent of the Electricity It Used in August, While Solar Touched a New Peak of 3,850 Megawatts

Portugal's grid operator published its August figures on Tuesday, and the headline everyone reached for was solar: a new instantaneous peak of about 3,850 megawatts, the highest photovoltaic output the country has ever recorded. The more consequential number sits three lines lower. In August, imported electricity covered 36 percent of national consumption, and the flow across the Spanish border hit a record of its own, above 5,200 megawatts.

An unusual month

August was not a good month for weather-dependent generation. REN reports productivity indices of 0.87 for wind and 0.82 for solar, against a historical average of 1. Hydro inflows ran above average, but as the operator drily notes, that carries little weight in a summer month. The result was a month in which renewables supplied 52 percent of national consumption, non-renewable generation 12 percent, and imports the remaining 36 percent.

That solar still set a power record in a month of below-average irradiation is a statement about installed capacity rather than sunshine. REN attributes the peak directly to capacity growth. The panels are winning on quantity.

Consumption itself kept climbing. August was up 1.2 percent year on year, or 2.2 percent once temperature and working-day effects are stripped out. Across January to August, consumption rose 3.1 percent, or 3 percent adjusted.

The import number is the story

A 36 percent import share in a single month is high by any Portuguese standard. Over the first eight months of the year the picture is far more comfortable: renewables at 66 percent of consumption, split between hydro (25 percent), wind (23 percent), solar (13 percent) and biomass (5 percent), with natural gas at 14 percent and the import balance at 20 percent.

What changed in August is partly physical. REN links the record 5,200 megawatt import flow to the recent reinforcement of the interconnection with Spain, the same upgrade that added 1,000 megawatts of cross-border capacity in July. Bigger pipes mean bigger flows in whichever direction the price signal points, and in a low-wind August it pointed east.

On gas, consumption rose 2.2 percent over the eight months, with the power-generation segment up 7.4 percent. Every molecule came ashore through the Sines LNG terminal, and the interconnection with Spain ran a net export balance equivalent to roughly a third of national consumption. Nigeria supplied 57 percent of the gas burned in Portugal this year, the United States 31 percent, Russia 6 percent and Spain the remaining 6 percent.

What this means for expats

• Your bill does not track the mix month by month: regulated and fixed-term tariffs smooth this out. A high-import month is a wholesale story before it is a household one.
• Interconnection cuts both ways: the same link that lets Portugal import cheaply in a still August lets it export in a windy January.
• Solar keeps outgrowing the weather: a record peak in a poor month is the clearest sign yet that capacity, not sunshine, sets the ceiling.
• Storage is the missing piece: Portugal has a storage plan out for consultation targeting 3.9 gigawatts of pumped hydro and 3 gigawatts of batteries by 2030, which is what would turn an August peak into an August evening.

The August data arrives days after WindEurope put Portugal's first-half onshore additions at 199 megawatts and in the same week the state bought back into REN itself, a move the energy minister justified in the language of security of supply. A month in which a third of the country's power came down a wire from Spain is, on its own terms, an argument for that position.