Key data
| Regulation | Circular 6/2026, of September 8, of the CNMC, which establishes the remuneration methodology for natural gas distribution |
|---|---|
| Publication | September 18, 2026 |
| Effective date | October 1, 2026 |
| Replaces | Circular 4/2020 (period 2021-2026) |
| Affected parties | Natural gas distribution companies and consumers subject to distribution tariffs |
| Category | Energy |
| Authority | National Commission of Markets and Competition (CNMC) |
Natural gas distributors in Spain face a significant regulatory change from October 1, 2026. The CNMC Circular 6/2026 replaces Circular 4/2020 —which covered the 2021-2026 period— and redefines how remuneration for these companies is calculated and what components it includes. The impact is not just technical: it directly affects the profitability of distributors and, ultimately, the tariffs paid by natural gas consumers.
What does this regulation establish?
Circular 6/2026 defines the remuneration structure applicable to companies that distribute natural gas in Spain from the new regulatory period. Total remuneration is broken down into the following components:
| Remuneration component | Description | Novelty compared to Circular 4/2020 |
|---|---|---|
| Base remuneration | Compensation for ordinary distribution activity | Maintained, with methodological update |
| Market development remuneration | Incentive linked to network growth and expansion | Maintained |
| RDCM (Digitalization, Cybersecurity and Methane Emissions Reduction) | New component that remunerate investments in digitalization, cybersecurity and methane leak reduction | New in this circular |
| Incentives for renewable gas injection | Additional remuneration for facilitating the injection of biomethane or other renewable gases into the network | New in this circular |
| Loss settlement | Compensation for gas losses in the distribution network | Maintained, with adjustments |
| Transitional distribution remuneration | Component inherited from previous periods | Eliminated: has already exhausted its effects |
A relevant change in the financial sphere is the financial prudence penalty: those distributors that fall outside the recommended debt ranges will see their penalty increased from the current 1% to 1.5% from 2030. This mechanism seeks to encourage prudent financial management aligned with regulatory parameters.
Additionally, the regulation strengthens information obligations: distributors must provide annual data on facilities and network development or closure plans, which increases CNMC regulatory oversight of the sector's profitability.
Economic and operational impact
The introduction of the RDCM component represents an opportunity for distributors that are already investing —or plan to invest— in network digitalization, cybersecurity of critical infrastructure and methane leak reduction. These investments, previously not specifically remunerated, now have explicit remuneration recognition.
Conversely, the elimination of transitional distribution remuneration definitively closes a revenue stream that some companies could continue to account for in their projections. Distributors that have not updated their financial models must do so immediately.
The tightening of the financial prudence penalty —from 1% to 1.5% from 2030— may seem marginal, but applied to the remuneration base of a medium or large distributor, it represents a significant economic impact. Companies with more leveraged capital structures have a four-year window to rebalance their balance sheet or assume a higher regulatory cost.
On the revenue side, incentives for renewable gas injection open a new business lever for distributors operating in areas with potential for biomethane or renewable hydrogen production, aligning remuneration with the decarbonization objectives of the gas system.
Who does it affect?
- Natural gas distribution companies in Spain: they are the direct recipients of the new remuneration methodology. They must review their business models, investment plans and financial structures.
- CFOs and financial directors of distributors: the change in the financial prudence penalty and the elimination of transitional remuneration directly affect regulated income projections.
- Operations and engineering departments: the new RDCM component requires planning and justifying investments in digitalization, cybersecurity and methane emissions control.
- Industrial and domestic consumers subject to natural gas distribution tariffs: the new methodology influences the cost structure passed on to tariffs.
- Regulatory advisors and energy consultants working with companies in the gas sector.
- Investors and financing entities of gas distribution infrastructure: the new remuneration structure and financial penalties affect the valuation of regulated assets.
Practical example
Imagine a regional natural gas distributor that, under Circular 4/2020, received three sources of regulated income: base remuneration, market development remuneration and transitional distribution remuneration. With the entry into force of Circular 6/2026 on October 1, 2026, its income statement changes as follows:
- The transitional remuneration disappears: that income can no longer be accounted for. If the company had not anticipated this, its regulated income statement is reduced from the first day of the new period.
- If the distributor has invested in digital network sensors, methane leak detection systems or industrial cybersecurity reinforcement, it can request remuneration under the new RDCM component, partially or fully offsetting the previous loss.
- If its debt ratio is outside the range recommended by the CNMC, from 2030 it will suffer a penalty of 1.5% on its base remuneration instead of the previous 1%. Four years is the available timeframe to correct the capital structure.
- If it operates in an area with biomethane projects, it can activate incentives for renewable gas injection as a new source of regulated income.
What should companies do now?
- Update the regulated financial model: eliminate transitional distribution remuneration from income projections and recalculate regulated EBITDA for the post-October 2026 period.
- Review the debt ratio: check whether the current financial structure falls within the ranges recommended by the CNMC to avoid the 1.5% penalty that comes into effect in 2030. There is room for action, but time is running out.
- Identify investments eligible for the RDCM component: map ongoing or planned projects for network digitalization, cybersecurity and methane emissions reduction to request their remuneration recognition under the new component.
- Evaluate renewable gas potential: analyze whether own distribution networks have the capacity to receive biomethane or other renewable gas injections and thus activate the new remuneration incentives.
- Prepare the annual information system: Circular 6/2026 requires annual reporting of data on facilities and network development or closure plans. Design the internal process for collecting and validating this information before the first reporting period.
- Communicate the impact to investors and financiers: update investor presentations and credit entity documents with the new remuneration structure, especially if there is financing linked to regulated flows.
Frequently asked questions
When does CNMC Circular 6/2026 come into effect for gas distributors?
Circular 6/2026 comes into effect on October 1, 2026. It was published in the BOE on September 18, 2026. It replaces Circular 4/2020, which regulated the 2021-2026 period.
What is the RDCM component and what does it cover?
The RDCM (Digitalization, Cybersecurity and Methane Emissions Reduction) is a new remuneration component introduced by Circular 6/2026. It specifically remunerate distributor investments in network digitalization, cybersecurity reinforcement of infrastructure and methane leak reduction. It is one of the main novelties compared to Circular 4/2020, which did not contemplate this type of remuneration in a differentiated manner.
How does the financial prudence penalty change with the new circular?
The financial prudence penalty increases from 1% to 1.5%, but this tightening is not immediate: it applies from 2030 onwards for distributors that fall outside the debt ranges recommended by the CNMC. Companies have until that date to adjust their capital structure if they want to avoid the higher regulatory cost.
What happens to transitional distribution remuneration?
Transitional distribution remuneration is eliminated with Circular 6/2026, as it exhausted its effects during the previous period. Distributors that had it accounted for in their income projections must update their financial models to reflect its disappearance from October 1, 2026.
What new information obligations does Circular 6/2026 impose?
Distributors must provide annual information on their facilities and network development or closure plans. This obligation strengthens CNMC regulatory oversight of the sector's profitability and requires companies to design internal processes for collecting and validating data before the first reporting period.
Official source
Consult complete regulation in official source
Notice: This article is for informational purposes only and does not constitute legal advice. For specific decisions, consult a qualified professional. Source: https://www.boe.es/diario_boe/txt.php?id=BOE-A-2026-19427
