In Italy, every power plant operator that produces, distributes, or consumes electricity above the 20 kW threshold must register an officina elettrica(power plant) with the Italian Customs Agency (ADM) and file periodic AD-1 consumption returns. The specific obligations, which ADM license you need, which quadri of the AD-1 form you must complete, and whether excise duty is due, depend on the operator's declarant category (figura dichiarante) under Arts. 52-54 of the Testo Unico delle Accise (TUA, the Italian Excise Code).
This guide covers the 8 declarant categories recognized by ADM, the corresponding license types, and the AD-1 quadri each category must complete. Once you have identified your category here, our complete guide to the AD-1 declaration walks through how to fill in those quadri and calculate the excise due.
Quick definitions
- Power plant (officina elettrica)
- Fiscal unit recognized by ADM that holds the license, accounting records, and AD-1 filing; it may group multiple sites of the same operator.
- Declarant category (figura dichiarante)
- Category of liable operator (8 types under Arts. 52–54 TUA as updated by D.Lgs. 43/2025); determines license type and mandatory AD-1 quadri.
- Operating license (licenza di esercizio)
- ADM authorization required for renewable producers above 20 kW, BESS with third-party supply, RIU operators, and non-renewable producers.
- Authorization (Art. 53 TUA)
- Lighter ADM act than the license; typical for purchasers with own use or mixed use.
- BESS
- Battery Energy Storage System; does not produce energy but absorbs and returns it. Triggers obligations when discharged energy is supplied to third parties.
- RIU
- Rete Interna d'Utenza: private network connecting multiple injection and withdrawal points within a delimited perimeter.
- 20 kW threshold
- Nominal power below which self-consumed renewable plants are exempt from excise (Art. 52, paragraph 1, TUA).
The 8 declarant categories at a glance
| Category | Description | Excise due? | Key quadri |
|---|---|---|---|
| 1 | Exempt renewable producer (PV, wind, hydro; own-use, ≤20 kW) | No | None (no AD-1 required) |
| 2 | Exempt renewable producer (>20 kW, feeds grid, no own use) | No | A, H |
| 3 | Excise-liable producer (any source, own use or sales) | Yes | A, B, E |
| 4 | Purchaser for own use (buys from grid, self-consumes) | Yes | B, C, E |
| 5 | Purchaser for resale / distributor | Yes (on sales) | C, G, E |
| 6 | Mixed-use purchaser (own use + resale) | Yes | B, C, G, E |
| 7 | BESS operator (storage system) | Depends on use | I, B or G, E |
| 8 | RIU operator (internal distribution network) | Yes | L, B, E |
Category 1: Exempt small renewable producer
Photovoltaic, wind, or hydroelectric plants with nominal power at or below 20 kW, where the producer self-consumes the entire output (no grid injection beyond net metering), are fully exempt from electricity excise under Art. 52, paragraph 3, TUA. No power plant registration is required, and no AD-1 is filed.
This is the most common setup for domestic rooftop solar in Italy. The 20 kW threshold refers to nominal (nameplate) power, not actual production.
Category 2: Exempt larger renewable producer (grid injection)
Renewable producers above 20 kW that feed all (or substantially all) of their electricity into the national grid and do not consume it on site. Production is exempt from excise because no taxable consumption occurs at the plant. A power plant license is still required, and AD-1 quadri A (production) and H (exempt quantities injected) must be filed.
Category 3: Excise-liable producer
Any electricity producer above 20 kW that consumes part or all of its own output on site, or sells it directly without going through a licensed distributor. This covers:
- Commercial photovoltaic plants with self-consumption
- Cogeneration (CHP) units
- Diesel generators used as primary or backup power
- Renewable energy communities (CER) producing for member consumption
Required quadri: A (production), B (own consumption by use type), E (excise calculation). An ADM production license (licenza di officina) is required.
Category 4: Purchaser for own use
An operator that buys electricity from the grid (via a licensed supplier) and consumes all of it for its own use, without reselling to third parties. This is typical for large industrial consumers buying directly on the wholesale market or under interruptible supply contracts.
Required quadri: B (consumption), C (purchases), E (excise). An ADM consumption license (licenza di utenza) is required.
Category 5: Purchaser for resale (distributor)
Electricity distributors and resellers that buy from the grid or a producer and sell to end consumers. The excise obligation falls on the final sale to the end consumer; the distributor collects and remits excise on behalf of its customers.
Required quadri: C (purchases), G (sales by use type and territory), E (excise). An ADM distribution license is required.
Category 6: Mixed-use purchaser
An operator that both consumes electricity for its own use and resells a portion to other parties (for example, an industrial site that also supplies electricity to tenant businesses on the same premises). Own-use and resale components must be declared separately.
Required quadri: B, C, G, E. This is the most complex category and usually requires careful metering to separate own-use from resale flows.
Category 7: BESS operator
Battery Energy Storage System (BESS) operators get a specific treatment under D.Lgs. 43/2025: electricity charged into the battery is not taxable at the point of charge, but is taxable when discharged for consumption or sale. The net charge/discharge balance over the declaration period determines excise liability.
Required quadri: I (storage data), plus B or G depending on whether the discharged electricity is self-consumed or sold, plus E (excise calculation).
Category 8: RIU operator
Operators of reti interne di utenza (RIU, internal user networks): private electricity distribution networks within industrial sites, business parks, or similar enclosed areas that supply multiple users from a single connection point. The RIU operator is responsible for the excise on all electricity consumed within the network.
Required quadri: L (network data), B (consumption), E (excise). RIU operators need a specific ADM registration and face additional metering obligations to track consumption by individual user within the network.
Identifying your declarant category
The correct declarant category depends on the combination of:
- Plant type: production, distribution, storage, network
- Nominal power: above or below the 20 kW threshold
- Energy source: renewable vs. non-renewable (affects exemption eligibility)
- End use: own consumption, resale to third parties, or mixed
- Grid injection: whether surplus is fed into the national grid
If your plant characteristics change during the reference period (for example, you add a BESS or start selling surplus energy), you may need to file under a different or combined category. Deklara's wizard guides you through category selection based on your answers and automatically loads the correct set of quadri for your AD-1.
Further reading
- Complete Guide to the AD-1 Declaration: pillar reference on quadri, deadlines, and excise duty calculation.
- D.Lgs. 43/2025: What Changes for AD-1 Declarations in 2026: how the 2025 reform reshaped the declarant categories and their obligations.
- Renewable Energy Communities (CER) and the AD-1 Declaration in Italy: declarant mechanics applied to CERs as a collective legal entity.
- Power Plant Surety Bond in Italy 2026: The New 15% Calculation: which declarant categories must lodge a bond and how it is sized.