From 28 August, data centre applications above the environmental permit threshold go to Lombardy's regional desk. The single procedure shortens the environmental stage while leaving planning conformity untouched, and that remains the scarce asset.
On 3 August 2026, through resolution XII/6646, the Lombardy regional government approved technical and administrative guidelines for handling the single authorisation procedure for data centres. The rules apply to applications filed from 28 August, the date of publication in the regional official bulletin. They implement article 4, paragraph 8 of regional law 11 of 3 June 2026, Italy's first organic framework on data centre siting.
How the framework came together
The single procedure originates at national level with article 8 of decree law 21 of February 2026, the so-called energy bill decree, converted with amendments by law 49 in April. It is managed by the authority responsible for the integrated environmental permit, which is absorbed into the procedure itself.
Lombardy reorganised competences on that basis. Where a project requires the environmental permit under article 7, paragraph 4-ter of the environmental code, the single authorisation falls to the Region and is handled through a dedicated regional data centre desk. Below that threshold, ordinary municipal and provincial procedures remain, standardised by guidance from a task force bringing together the Region, environmental and health agencies, provinces, the Milan metropolitan authority and the regional association of municipalities. The Region intervenes directly for projects above 50 megawatts and for those spanning more than one province. The threshold matters, since most schemes currently in the Lombardy pipeline sit above it.
Environmental permit applications already pending on 28 August stay with the metropolitan authority or the relevant province.
The constraint the procedure does not touch
This is the point that matters for anyone appraising a site. The resolution confirms guidance already issued at ministerial level: planning conformity is a necessary precondition for opening the single procedure, and the single authorisation does not in itself amount to a variation of existing planning instruments.
The acceleration therefore concerns the environmental and permitting side, not the planning side. A site without a compatible designation still has to go through a variation, with the timelines and political uncertainty that entails. Anyone expecting the procedure to work like the substitutive routes available for renewables finds the limit here.
A clear valuation consequence follows. The scarce asset is not land close to fibre and a primary substation. It is land that already carries a compatible designation, an available grid connection and a confirmed capacity allocation from the operator. Two constraints, and the new procedure eases only one.
What the Region additionally requires
Applications must include an energy report showing how on-site renewable generation is maximised. The regional law adds environmental criteria, incentives and supra-municipal agreements.
The supra-municipal agreement deserves separate consideration. It recognises, institutionally, that a data centre's impact spreads across a territory wider than the host municipality, through land take, water abstraction and grid load, while the fiscal benefit has historically stopped at the municipal boundary. Moving negotiation to a supra-municipal scale aligns costs and revenues better, and lengthens the negotiation phase.
How the arithmetic is rewritten
For a site appraised as a data centre location, residual land value must now absorb two items previously sitting at the edge of the calculation: the cost of compensations agreed in the territorial agreement, and the time needed to conclude it.
In exchange, a category of risk that weighed heavily is reduced. Until June the same scheme could receive different treatment moving from one province to another, with timing effects hard to price when bidding for land. The regional desk closes that gap above the permit threshold.
Lombardy holds the largest share of Italy's data centre pipeline, and for the first time governs siting through a dedicated instrument rather than by analogy with industrial plant. The cost of compliance rises, the variance on timing falls. For an investor working on a seven to ten year horizon the second quantity matters more than the first, provided planning conformity has already been settled upstream.