Permitting Renewables in Italy: Autorizzazione Unica, PAS and the Regional Maze

Ask a developer which European permitting regime is hardest to plan around, and Italy comes up fast. Not because the rules are missing — since the end of 2024 they are, for once, consolidated in one place — but because the gap between the statutory clock and the real one is wide, and because what a region may add on top has been litigated continuously for two years.

This is an operational overview for developers running Italian projects inside a multi-country portfolio — what the regimes are, where the time actually goes, and what it means for how you track permitting. Rules current as of August 2026; verify anything decision-critical with counsel, because this landscape moves.

Three regimes, one Testo Unico

Legislative Decree 190/2024 — the Testo Unico FER, in force since 30 December 2024 — consolidated Italian renewable permitting into exactly three administrative regimes:

• Attività libera (Annex A): no communication to any authority at all for the listed cases — rooftop PV up to 12 MW, ground-mounted PV up to 5 MW in industrial or commercial areas, quarries or closed landfills, standalone storage up to 10 MW, small wind — conditions permitting.
• PAS — Procedura Abilitativa Semplificata (Annex B): a certified filing with the municipality; the title forms by silent assent thirty days after submission (forty-five where cultural or landscape constraints require consent acts) if no motivated denial arrives.
• Autorizzazione Unica (Annex C): the full single-authorization procedure for utility-scale plants, built around a conferenza di servizi that gathers every concerned authority into one proceeding.

A correttivo decree (D.Lgs. 178/2025, in force since 11 December 2025) then extended the framework to storage and electrolyzers, added an anti-fragmentation rule so projects cannot be sliced under thresholds, and legislated a national digital one-stop-shop (SUER) that is still being rolled out. Since 31 July 2026, state-competence filings must go through the new Permitting FER portal — paper submissions are inadmissible.

Regions had until 28 June 2025 to adapt their own rules; past that date the decree applies directly. Regions may simplify further — including raising Annex A and B thresholds — which means the boundary between regimes can legitimately differ from one region to the next. Model that per region, not per country.

Autorizzazione Unica: the statutory clock and the real one

For most utility-scale projects, the AU is issued at regional level (or by a delegated province). Above 300 MW, and for offshore, competence moves to the state (MASE). The conferenza di servizi must conclude within 120 days of its first meeting — suspendable by up to 90 days where a VIA (environmental impact assessment) applies — and the resulting authorization is valid for no less than four years.

That is the statutory clock. The real one: overall permitting for Italian utility-scale projects commonly exceeds four to five years, and the environmental step alone tells you why. Of the 145 national VIA decisions on renewables issued in the first half of 2025, the average time from the start of the environmental procedure was roughly 940 days for agrivoltaic, 1,060 for PV and 1,020 for wind. Even the fastest cases took around a year.

When the statutory timeline says 120 days and the observed average says three years, the difference is not noise. It is the thing your portfolio plan has to absorb.

The regional maze: aree idonee and two years of litigation

The second layer of unpredictability is regional. Under the aree idonee framework (D.Lgs. 199/2021 and the June 2024 ministerial decree), regions designate suitable and unsuitable areas for renewables by regional law. What followed was two years of courtroom back-and-forth that any Italian portfolio has had to price in:

• TAR Lazio partially annulled the Aree Idonee decree in May 2025 for lacking uniform national criteria — but the Consiglio di Stato reversed that in July 2026 (sentenza 6151/2026): the decree stands, regions keep their designation power, and a "non idonea" classification is not an absolute bar, only a stricter motivation burden in the individual authorization.
• The Constitutional Court, meanwhile, has struck down regional blocking laws three times in seventeen months — Sardinia's moratorium (sentenza 28/2025), key provisions of its aree idonee law (184/2025), and its suspension of authorization procedures (144/2026). Regional moratoria on renewable permitting are illegitimate; blanket "non idonea" prohibitions are too.
• The Testo Unico itself survived: Sicily's constitutional challenge was rejected in February 2026 (sentenza 13/2026).

The operational translation: the national framework is more stable in mid-2026 than at any point since 2023 — but which areas are open, and under which regime, is decided region by region and revised by courts. A project's permitting path in Sardinia and its twin's in Lazio are different processes with different risk profiles, even under one national decree.

The queue behind the permits

Permitting is only half the race. As of February 2026, renewable grid connection requests at Terna stood at around 320–330 GW — against roughly 70 GW of new capacity Italy needs by 2030. The queue has been slowly declining since August 2025 as clean-up rules bite, but the ratio is still four to five times the target, and only a thin slice — under 10 GW of PV — sat in the final ready-to-build connection stage. Your STMG connection estimate must be accepted within 120 days or the request lapses; the connection milestone chain deserves the same tracking discipline as the permits themselves.

Why baseline-tracked permitting matters most exactly here

Italy is the strongest argument in Europe for treating permitting as a governed process rather than a list of dates. Long procedures with high variance mean forecasts get revised many times before an AU is granted — and if each revision overwrites the last, the portfolio loses precisely the information leadership needs: how far the project has drifted, since when, and whether the trajectory is stabilising or deteriorating.

• Model the Italian chain as its own process — AU or PAS, VIA inside it, regional variations, Terna's connection milestones — not as a generic pipeline with Italian labels.
• Keep versioned approved baselines, so a conferenza di servizi that suspends for 90 days is a measured deviation with a cause, not a silently moved date.
• Quantify the exposure: a year of drift on a project with an accepted connection estimate and an auction deadline is a number in euros, and an investment committee should see it as one.

Navorda models permitting processes per country and technology against versioned approved baselines — the Italian maze included — so deviation is measured, not remembered.

The pillar post: what changes when your projects are in Europe, not the US

Guide: permit tracking software for energy projects