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Further reading on the AD-1 declaration

The blog guides that answer the questions power plant operators ask us most often.

• If you are preparing your first filing, start with the complete guide to the AD-1 declaration: quadri, deadlines, and excise calculation in a single article.
• To work out which ADM licence applies to you, the article on power plant declarant categories, ADM licences and filing obligations compares the categories under Art. 52 to 54 TUA.
• On the new guarantee calculation, we wrote a dedicated guide to the 2026 power plant surety bond at 15%, with worked examples and the quarterly adjustment.
• To plan the year ahead, the AD-1 deadline calendar for 2026 brings together semiannual filings, monthly down-payments, and the settlement.

Frequently asked questions for power plants

Who has to file the AD-1 declaration?

The semi-annual declaration is required for holders of a generation power plant (self-producers), professional users with a license, power plants for purchase for own use, and electricity resellers under Art. 53 TUA. Power plants that use electricity under an Art. 52 TUA exemption (for example self-consumption from renewables) also file, with quadri A, C, and G. Producers that feed all their electricity into the grid file an annual communication instead (Art. 56-bis TUA).

When are the declarations due in 2026?

D.Lgs. 43/2025 introduced a semi-annual cadence: the H1 2026 declaration (January-June) was due on September 30, 2026; the next deadline is H2 2026 (July-December), by March 31, 2027 (DM 10 March 2026, Art. 8). Monthly down-payments are due by the end of each month, based on the previous month's quantities (Art. 55(3) TUA), so January quantities are paid by the end of February; the settlement is due by the end of the month in which the declaration is filed. The DM 10 March 2026 confirmed the tracciati and forms for the new flow.

How is the electricity excise calculated?

Excise follows the brackets under Art. 52 TUA, with different rates for industrial use, residential use, and consumption tiers. The exemptions under Art. 52(3) TUA cover electricity used for generation and for maintaining generating capacity, including plant auxiliaries (Art. 52(3)(a)), self-consumption from renewable sources above 20 kW (Art. 52(3)(b)), railways (Art. 52(3)(c)), urban and interurban transport lines (Art. 52(3)(d)), and homes up to 3 kW (Art. 52(3)(e)). Deklara applies the brackets automatically to the kWh entered per quadro.

Is the surety bond paid every year?

The surety bond is a continuous guarantee (bank or insurance bond, or cash deposit) sized against the estimated annual excise under the criteria of D.Lgs. 43/2025. It is posted once when the power plant opens and adjusted every quarter to the average excise due over the previous three months, by the end of the following month; no adjustment is needed if the increase is below 10% of the bond posted. It is not a recurring payment: it only needs to be renewed if the guarantor or the amount changes.

How much does Deklara cost for my power plant?

Public price list, VAT excluded: Solo €199/year for 1 power plant, €599/year up to 5, €949/year up to 10, €1,249/year up to 15, €1,549/year up to 20, €1,849/year up to 25 power plants. Discount -15% on 3 years, -30% on 5 years. Consultant Add-on +€199 one-time, first 3 clients included. For the managed Zero service (Deklara files on your behalf), plans start at €399/year for 1 power plant.