Lisbon has put a number on its energy storage ambitions — 6.9 GW by 2030 — and opened the plan to public scrutiny. The real story is in how it intends to get there.
Portugal’s government has spent the summer of 2026 talking about energy storage in increasingly specific terms, and this week the talk turned into a document the public can actually push back on. On August 31, the Ministry of Environment and Energy opened a 20-day public consultation on its National Energy Storage Strategy — ENAE, in the local shorthand — via the Participa.pt platform, with submissions due by September 16.
The headline figures are big: 6.9 GW of installed storage capacity by 2030, rising to 9.76 GW by 2040. But the strategy, first unveiled by Environment and Energy Minister Maria da Graça Carvalho and Secretary of State for Energy Jean Barroca on July 21, is less interesting for its targets than for how it splits them — and for what it admits could go wrong along the way.
A tale of two technologies, and one enormous gap
ENAE isn’t betting on a single storage technology so much as pairing two of them deliberately. Batteries are pencilled in for 3 GW by 2030 and 4.5 GW by 2040 — fast to build, but with a shorter operating life. Pumped hydro is expected to do the heavier lifting over time, growing from roughly 2.8 GW today to 3.9 GW by 2030 and beyond 5 GW by 2040, a build-out that includes the Alto Lindoso expansion and a planned facility at Minhéu. Add the two together and the totals line up almost exactly with the government’s headline numbers.
What the strategy doesn’t dress up is the scale of the gap on the battery side. Portugal had just 20 MW of battery storage installed at the end of 2025. Getting to 3 GW by 2030 means roughly a 150-fold increase in five years — which is precisely why the September auction covering 1.05 GW of grid capacity (750 MW for standalone batteries, 300 MW for co-located renewable-storage projects), which this outlet covered in detail last month, matters as more than a one-off procurement round. It’s the first real test of whether Portugal’s project pipeline can move at the speed ENAE assumes.
The regulatory plumbing behind the targets
The consultation document spends as much energy on market design as on megawatts, and this is where it earns a closer read. It proposes letting storage stack revenue across electricity markets, system services and future capacity mechanisms — with an explicit commitment that those capacity mechanisms treat batteries and pumped hydro on equal footing, rather than favouring one over the other. It also opens the door to new markets for fast frequency response, synthetic inertia and voltage regulation, leaning on the grid-forming capabilities of modern storage inverters, and floats combining synchronous compensation with grid-forming storage as a way to keep the Iberian grid stable as more variable renewables come online.
On the practical side, the strategy proposes clawing back grid capacity tied up by projects that were never going anywhere, speeding up permitting, and closing loopholes that had left some storage projects facing double tariff charges. None of that is glamorous, but developers in Portugal have long pointed to exactly these frictions — stalled connections, unclear licensing, murky tariff treatment — as the real bottleneck, more than any shortage of ambition.
A candid warning tucked into the technical annex
Perhaps the most unusual thing about ENAE is what it doesn’t oversell. The technical studies behind it, produced by INESC TEC, INESC-ID and IN+, warn that pushing significantly past the 2030 and 2040 targets could bring diminishing returns — and even “economic cannibalisation” among storage assets competing for the same revenue streams. For a government document trying to build momentum for a sector, that’s a notably candid admission, and it suggests the 6.9 GW figure isn’t just aspirational marketing but something closer to a calculated ceiling.
The studies also underline why storage matters beyond grid stability: it improves the price solar developers actually capture for their output and cuts the curtailment losses that build up when generation runs well ahead of demand — a problem Portugal, sitting at roughly 80% renewable electricity, is increasingly familiar with. Storage is also expected to chip away at the role of combined-cycle gas plants, a point Minister Carvalho has made directly, framing more storage as a route to “more accessible, cheaper, and cleaner energy.”
Pumped hydro’s expansion still needs European Commission sign-off before it can proceed at the scale ENAE envisions, and the battery side needs licensing reform to actually deliver on paper targets. Both processes are now, quite literally, open for comment. Anyone with a stake in how Portugal’s grid handles its renewable surplus over the next decade has until September 16 to have their say.
