2026 energy calendar: regulatory obligations, taxation and key dates for businesses

Uncertainty hangs over 2026.

The energy sector is no exception, between governmental instability and the wait for the third multiannual energy plan (PPE3).

However, the 2026 energy calendar is already dense for businesses and communities. Tax developments, reporting obligations and regulatory changes punctuate the year, and impact energy budgets, purchasing strategies and investments.

Faced with this complexity, Sirenergies identifies the key deadlines in order to secure your choices, optimize your contracts and seize opportunities.

Discover how to anticipate in order to sustainably control your energy costs, in a context that is more volatile than ever.

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1.2026 energy taxation: a direct impact on the energy budget of companies

In 2026, energy taxation was subject to several successive adjustments. Taken in isolation, they may seem marginal.

But combined, they represent several hundreds - even thousands of euros - on your energy bills.

1.1 1^Er February: increase in the excise duty on electricity (ex-TICFE)

The 2026 finance law confirms the Mechanical lift Of theexcise on electricity.

Debated by parliamentarians, the reduction in the electricity tax was finally not retained.

After indexation, the excise duty on electricity is set at 1^Er February 2026 to:

1.2 1^Er February: increase in gas excise duties (ex-TICGN)

Usually scheduled for 1^Er January, the revaluation of the excise duty on gas was postponed to 1^Er February.

The finance law confirms the passage of excise duties on natural gas used as fuel from 15.43 €/MWh to 16.39 €/MWh. This amount includes the increase intended for investments in non-interconnected areas (ZNI).

1.3 1^Er February: CTA falls

Surprise announcement at the start of the year, the Delivery Rate Contribution (CTA) Fall to 1^Er February from 21.93% to 15%.

This decrease is reflected in reduction in the fixed portion of the subscription on electricity bills. For a bakery or a small workshop, the annual savings can reach 200 euros per year.

1.4 1^Er February: fall in regulated electricity tariffs (TRV)

Driven by the lull in the electricity markets, the 2026 TRVs are trending downward in the 1^Er February, with - 1.58% TTC for professional blue rates.

The Commission for Energy Regulation (CRE) does not communicate detailed developments for higher powers (yellow and green tariffs).

Updated every six months, TRVs could Evolve again to 1^Er August.

1.5 1^Er April: increase in the ATRT 8

As every year, CRE updates the tariff for third party access to gas transport networks (ATRT) on 1^Er April.

One increase of 3.41% is announced. It includes the third party storage access rate (ATS).

1.6 1^Er July: annual review of ATRD 7

The annual review of Tariff for Third-Party Access to Distribution Networks (ATRD) is expected on 1^Er July.

After two years of successive increases, The 2026 rate has not yet been announced.

1.7 1^Er August: reassessment of TURPE 7

Entered into force on 1^Er August 2025, the TURP 7 (tariff for the use of public electricity networks) should change to 1^Er August.

The rate is reassessed each year by CRE on the basis of inflation and two coefficients: the annual evolution of costs and the settlement of the Enedis expenses and income adjustment account (CRCP).

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Table 1: Summary 2026 energy taxation

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2.The race to report energy consumption

The 2026 energy calendar is also punctuated by reporting obligations for businesses. More than ever, regulatory compliance is based on the quality, reliability, and traceability of data.

2.1 September 30: deadline for reporting Tertiary decree

Since 2022, companies and communities occupying more than 1000 m² of buildings for tertiary use must report their annual consumption on the OPERAT platform.

They have until September 30, 2026 to report 2025 energy consumption.

The absence of a declaration exposes businesses to a reputational risk. Non-compliant companies are listed on a website, according to the principle of “Name and shame.” 

Professionals who do not implement a program to reduce energy consumption, for their part, incur a financial fine : 1,500 euros for a natural person and 7,500 euros for a legal person.

2.2 11 October: new deadline for the mandatory energy audit

Starting in 2026, The perimeter Mandatory energy audit widens. It now concerns businesses whose average annual energy consumption is:

• exceeds 2.75 GWh (i.e. 10 TJ),
• over the last three years,
• regardless of size or sector of activity.

The new obligors have until October 11, 2026 to carry out their first energy audit.

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Test the Pilott centralized energy management platform to prepare your energy declarations and audits, in complete compliance and serenity.

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Table 2: Summary declarations and audits 2026

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3. Energy calendar: regulatory obligations that influence your energy budget in 2026

The year 2026 marks the entry into force of obligations and structuring mechanisms, which are likely to impact investment strategies and electricity purchases.

3.1 1^Er January: end of ARENH and establishment of UNV

Since the 1^Er January, the Regulated Access to Historic Nuclear Electricity (ARENH) is replaced by the Universal Nuclear Payment (UNV).

Backed by the wholesale market, UNV breaks with the ARENH regulated price mechanism. Consumers are now exposed to the volatility of electricity prices.

This new device transforms the purchase of electricity into strategic financial variable, to be managed with agility and foresight.

At this stage, the concrete impact of UNV on invoices remains difficult to anticipate. At current price levels, it is not expected to be activated in 2026. 

3.2 1^Er January: start of the 6^th EEC period

The 6^th Period of Energy Saving Certificates Opened on 1^Er January.

It is characterized by a 27% increase in bonds energy suppliers. She also gives the priority to works deemed to be efficient (global energy renovation, electric mobility, heating support...)

For professionals, it is time to plan to maximize the assistance that can be mobilized and sustainably reduce energy consumption.

3.3 1^Er January 2026: entry into force of Biogas Production Certificates (CPB)

Since the 1^Er January 2026, gas suppliers must justify that a portion of their customers' consumption is covered by biomethane, by acquiring Biogas Production Certificates (CPB).

The impact of this progressive system on the gas bill remains to be evaluated.

For 2026, the CRE estimates that 8.3 euros the annual additional cost for an average consumer (14 MWh/year). It could rise to 79 euros in 2028.

3.4 1^Er July: reinforcement of the obligation to use renewable energy on roofs

Starting on 1^Er In July, the Renewable Energy Acceleration Act (APER law) reinforces the obligation to install a renewable energy production system on the roof.

In 2026, the minimum coverage rate increases from 30 to 40% of the roof surface.

All buildings are affected (commercial, industrial, tertiary, warehouses...), during a new construction, an extension or a major renovation of more than 500 m² of land space.

3.5 1^Er July: deployment of photovoltaic shades in car parks

At 1^Er July, the APER law requires companies to equip their car parks of more than 10,000 m² with photovoltaic shades. These should cover at least 17.5% from the surface. The objective? Achieve 50% shade thanks to a mix combining photovoltaics and vegetation.

An exemption is possible for companies until January 2030. To benefit from it, companies must commit to investing in more efficient panels, produced in Europe.

Next deadline: 1^Er July 2028 for car parks between 1,500 and 10,000 m².

3.6 Second half of 2026: the seasonality of off-peak hours

In 2026, the application of the new TURPE 7 tariff structure continues.

After the new distribution of day and night off-peak hours, the device becomes seasonal starting in autumn 2026. It provides for:

• From April to October: more off-peak hours during the day in order to take advantage of renewable electricity production (solar and wind)
• From November to March: a concentration of off-peak hours at night.

9.3 million consumers are affected. Priority is given to individual consumers, before an extension to professionals in 2027.

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With Sirenergies, anticipate, personalize and manage your purchasing and investment strategy, so as not to be subject to regulatory obligations and innovations.

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Table 3: Recap 2026 regulatory obligations

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Conclusion

The 2026 energy calendar focuses on numerous fiscal and regulatory developments. In this uncertain and restrictive environment, a purely reactive approach is no longer enough. The control of energy costs and budgets is now based on proactive, anticipated and continuously optimized management.

With Sirenergies, secure your purchasing and investment strategies and transform regulatory and financial constraints into real drivers of management, compliance and performance.

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