The national framework changed with Law 4/2026, and the regions are legislating at very different speeds. This page brings the state of implementation together in one place, with each region's act and official source, and says openly where the research is not yet complete.
Last updated: · Also in Italian: Aree idonee, regione per regione
Law no. 4 of 15 January 2026 (Gazzetta Ufficiale no. 15 of 20 January 2026) converts Decree-Law 175/2025 and moves the aree idonee rules into articles 11-bis and following of Legislative Decree 190/2024. The conversion has been in force since 21 January 2026. Anyone still relying only on the Ministerial Decree of 21 June 2024 or on Legislative Decree 199/2021 is therefore working on an outdated framework.
For agricultural land, the national framework ties additional regional aree idonee to a share of between 0.8 and 3 per cent of the utilised agricultural area (SAU), with counting rules and municipal limiting powers set by article 11-bis(4)(g) and (h). This is, however, a criterion for regional designation. It is not a right to use the land, nor a universal 3 per cent cap that applies to every parcel.
Many summaries in circulation still get this wrong. Annex B of Legislative Decree 190/2024, in the text in force from 21 February 2026 and reproduced in the coordinated text of April 2026 in the Gazzetta Ufficiale, places photovoltaics below 12 MW in aree idonee and acceleration zones under the PAS. The threshold is strict: below 12 MW, not up to 12 MW. Summaries that cite 10 MW are out of date.
There is also a separate branch. Annex B allows the PAS for ground-mounted photovoltaics from 5 MW up to 15 MW in industrial, commercial and craft zones, and in closed landfills and quarries that meet the requirements. So there is no single capacity boundary that holds across Italy.
The columns keep apart three facts that do not coincide: adoption, publication and entry into force. Nine regional laws have been verified against the original. For the others, the row says where the process really stands, whether that is a proposal in committee, a text approved but not yet published, or research that established nothing. The status below is as verified against the original sources on 5 October 2026, with the Liguria, Sicily and Friuli Venezia Giulia rows updated on 20 October 2026. Not established in this research does not mean not published.
| Region | Status | Act | Source |
|---|---|---|---|
| Abruzzo | Law verified | Regional Law no. 9 of 7 May 2026, BURAT ordinary no. 19 of 13 May 2026, in force from 14 May 2026; amended by art. 38 of Regional Law no. 13 of 3 July 2026 | BURAT |
| Basilicata | Not established in this research | The regional law register does not expose a complete searchable corpus | Law register |
| Calabria | Not established in this research | Council databases and BURC consulted; dedicated law not established | Databases |
| Campania | Not established in this research | Only the earlier renewables framework found, Regional Law no. 37 of 6 November 2018, which does not prove implementation of art. 11-bis | Regional legislation |
| Emilia-Romagna | Law verified | Regional Law no. 5 of 29 May 2026, BURERT no. 135 of 29 May 2026, in force from 30 May 2026; amending bill 3299 being tabled | Demetra |
| Friuli Venezia Giulia | Law verified | Regional Law no. 2 of 4 March 2025, 1st ordinary supplement no. 2 of 6 March 2025 to BUR no. 10, in force from 7 March 2025; the cross-reference in art. 8(4) was updated by art. 55(18) of Regional Law no. 11 of 16 October 2026, 1st ordinary supplement no. 30 of 19 October 2026 | BUR FVG |
| Lazio | Not established in this research | Official list of laws in force and BUR consulted; post-reform law not established | Regional laws |
| Liguria | Law verified | Regional Law no. 12 of 5 October 2026, BURL no. 11 of 7 October 2026, part I, in force from 22 October 2026 | BURL |
| Lombardy (Lombardia) | Law verified | Regional Law no. 10 of 21 May 2026, BURL no. 22, supplement, 25 May 2026 | NormeLombardia |
| Marche | Approved by the Regional Executive, not yet law | Bill approved by the Giunta on 19 October 2026 and sent to the Regional Council, after the consultation of 16 September 2026; no published act established in the BUR | Region |
| Molise | Proposal reported, not established | Proposal reported as of 27 February 2026; official register and any later law not found | Region |
| Piedmont (Piemonte) | Law verified | Regional Law no. 15 of 28 July 2026, B.U. Piemonte no. 29, 8th supplement, 28 July 2026, in force from the day of publication (art. 14(1)) | Arianna |
| Apulia (Puglia) | Text approved in committee, not yet law | Committee examination and hearings of 18 March 2026; on 8 October 2026 Committees IV and V, sitting jointly, approved by majority, with the opposition abstaining, a text that entirely replaces the bill; no Council vote established | Regional Council |
| Sardinia (Sardegna) | Law verified, with partial annulments | Regional Law no. 20 of 5 December 2024, BURAS no. 65 of 5 December 2024; amended by Regional Law no. 31 of 6 November 2025, BURAS no. 61 of 13 November 2025. Constitutional Court judgments 184/2025 and 144/2026 annulled part of its provisions; judgment 156/2026 (filed 1 October 2026) found the questions raised by TAR Lazio on the same law inadmissible or unfounded | BURAS |
| Sicily (Sicilia) | Law published according to the ARS, GURS not reachable | Regional Law no. 21 of 4 August 2026, GURS no. 36 of 7 August 2026, according to the law database of the Sicilian Regional Assembly (ARS). The date of 22 July 2026 in a departmental notice is incompatible with the numbering: Regional Laws no. 18, 19 and 20 are dated 30 July 2026 | ARS |
| Tuscany (Toscana) | Proposal under examination, not yet law | A dedicated aree idonee proposal, distinct from the PRIZAT plan; committee hearings on 17 September 2026 | Regional Council |
| Trentino-Alto Adige, Autonomous Province of Trento | Act established, metadata to be completed | Provincial Law no. 4 of 2 May 2022, B.U. no. 17 of 3 May 2022; amended by Provincial Law no. 6 of 7 August 2026, in force from 8 August 2026, with a new annex B-bis | Provincial code |
| Trentino-Alto Adige, Autonomous Province of Bolzano | Not established in this research | Dedicated provincial law not established; a notice of 6 March 2026 concerns amendments to the existing implementing regulation | Lexbrowser |
| Umbria | Law verified | Regional Law no. 7 of 16 October 2025, BUR Umbria no. 51 of 17 October 2025; amended by Regional Law no. 4 of 7 April 2026, arts 86 to 94, in force from 9 April 2026. Art. 94 deletes the table in annex A | Leggi Umbria |
| Aosta Valley (Valle d'Aosta) | Law verified | Regional Law no. 24 of 28 July 2025, B.U. Valle d'Aosta no. 44, extraordinary, 8 August 2025, in force from 9 August 2025 | Regional Council |
| Veneto | Approved by the Regional Executive, not yet law | Bill approved by the Giunta on 28 July 2026 and sent to the Council; no published act established in the BURV | Region |
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Lombardy, Regional Law 10/2026, art. 2(2): additional aree idonee on agricultural land «non sono superiori allo 0,8 per cento della SAU dell'intero territorio regionale» (may not exceed 0.8 per cent of the utilised agricultural area of the whole region). The law also sets a municipal limit of 3 per cent and a provincial one of 2 per cent, with exceptions, and the count also covers electrochemical storage.
Emilia-Romagna, Regional Law 5/2026, art. 3(1)(a): «le aree racchiuse in un perimetro i cui punti distino non più di cento metri dai siti oggetto di bonifica» are suitable (areas within a perimeter whose points lie no more than one hundred metres from sites under remediation), with the availability conditions on the applicant and the exclusion of whoever is responsible for the contamination. Letter (b) uses 50 metres around data centres and SII plants, but only for self-consumption. Article 1(3) states expressly that suitability does not confer a right to install.
Sardinia is the case worth reading in full. Regional Law no. 20 of 5 December 2024, amended by Regional Law no. 31 of 6 November 2025, remains in force, but the Constitutional Court annulled parts of it in judgments 184/2025 and 144/2026. In judgment 156/2026, filed on 1 October 2026, it found the questions raised by TAR Lazio on the same law inadmissible or unfounded. A published act that is still in force can therefore contain provisions that no longer operate. That is why this page distinguishes between a verified law and a usable criterion.
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Below 12 MW under Annex B of Legislative Decree 190/2024, in the text in force from 21 February 2026. Summaries giving 10 MW are out of date. There is a separate branch from 5 to 15 MW for industrial, commercial and craft zones, and for qualifying closed landfills and quarries.
No. The range between 0.8 and 3 per cent is a criterion for the regional designation of additional agricultural areas, not a universal cap that applies to every parcel.
No. It means this research did not establish publication at the date shown. Adoption, publication and entry into force are separate facts.
No. Emilia-Romagna's Regional Law 5/2026 says so expressly in article 1(3), and the principle holds generally: suitability concerns location. It does not replace the authorization, nor the environmental and landscape assessments.
This page summarises provisions for information and does not replace legal or technical advice on a specific project. The national provisions and the regional laws cited were verified against the original on 5 October 2026; the Liguria, Sicily and Friuli Venezia Giulia rows were updated on 20 October 2026. The regional matrix is openly partial: the existence of a regional act does not prove that all its criteria remain operative after the national reform or after litigation. Only the official publication is authoritative.
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