Key data
| Regulation | Circular 5/2026, of September 8, of the CNMC |
|---|---|
| BOE Publication | September 18, 2026 |
| Entry into force | January 1, 2027 |
| Direct stakeholders | Regasification, transport, technical system management and natural gas distribution companies |
| Indirect stakeholders | Natural gas consumers (impact on tariffs) |
| Category | Energy — Gas sector regulation |
| Regulatory period | 2027-2032 (6 years) |
| Methodology applied | CNMC Circular 9/2025 (update of debt cost calculation) |
Regulated companies in Spain's natural gas sector now know the financial rules of the game for the next six years. The CNMC Circular 5/2026, published in the BOE on September 18, 2026 and in force since January 1, 2027, establishes the financial remuneration rate applicable to regasification, transport, technical system management and natural gas distribution activities for the 2027-2032 regulatory period.
This rate is not a minor detail: it directly determines how much regulated companies can earn from their assets, and ultimately conditions the system costs that are passed on to consumer tariffs.
What does this regulation establish?
Circular 5/2026 sets the financial remuneration rate—also called regulatory WACC—for each of the regulated activities in the gas sector. This rate is the percentage of profitability that regulation recognizes to companies on their network assets.
The key elements that configure this rate are:
- Updated methodology (Circular 9/2025): The debt cost calculation now combines historical and future data, instead of being based exclusively on past data as in previous periods.
- QE adjustment (Quantitative Easing): An adjustment is applied to the risk-free rate to correct the distorting effect that the ECB's quantitative expansion policies had on reference interest rates.
- Reduction of the regulatory leverage ratio: The debt-to-regulatory-assets ratio is reduced compared to the previous period (2021-2026), aligning it with the electricity sector and with the practice of other European regulators.
The circular has a validity of six years and was processed with public hearing and guidance from the Ministry for Ecological Transition and Demographic Challenge.
| Methodological element | Change from previous period |
|---|---|
| Debt cost calculation | Combines historical and future data (previously only historical) |
| Risk-free rate | QE effect adjustment from ECB is applied |
| Regulatory leverage ratio | Reduced; aligned with electricity sector and European regulators |
| Validity of regulatory period | 6 years (2027-2032) |
| Reference methodological standard | CNMC Circular 9/2025 |
Economic and operational impact
The financial remuneration rate is the most sensitive parameter in energy regulation: a variation of tenths of a percentage point can translate into tens of millions of euros difference in the revenues recognized to sector companies.
The three methodological changes have concrete effects on the profit and loss account of regulated companies:
- Combination of historical and future data in debt cost: In a rising rate environment like the current one, incorporating future expectations can slightly raise the recognized debt cost, which benefits companies with higher debt.
- QE adjustment: Corrects downward the artificial effect of ultra-low rates from the 2015-2022 period, which can result in a risk-free rate somewhat higher than if the adjustment were not applied.
- Lower leverage ratio: As the weight of debt in the regulatory capital structure is reduced, the resulting WACC may be somewhat lower, which puts downward pressure on recognized revenues. This is the change with the greatest potential negative impact for sector companies.
For natural gas consumers, the effect is indirect: a lower remuneration rate tends to reduce the regulated system costs, which can moderate network access tariffs. However, the final impact on the bill depends on multiple additional factors (gas prices in wholesale markets, operating costs, etc.).
Who does it affect?
- Regasification companies: Plants that convert LNG (liquefied natural gas) into gas for injection into the network. Their regulated revenues are fixed by the new rate.
- Natural gas transport companies: Operators of high-pressure pipelines. The profitability recognized on their network assets is governed by this circular.
- Gas system technical manager: The entity responsible for operational coordination of the system (currently Enagás Transporte). Its financial remuneration is equally regulated.
- Natural gas distribution companies: Operators of low and medium pressure distribution networks that supply gas to homes, businesses and industries. They are the most numerous group with the greatest territorial reach.
- Industrial and domestic consumers: Indirectly, through network access tariffs that are reviewed based on the regulated system costs.
- Investors and energy sector analysts: The remuneration rate is a key parameter for valuing regulated assets and making investment decisions.
Practical example
A natural gas distribution company with a regulatory asset base (RAB) of 500 million euros will see its recognized revenues directly conditioned by the rate set in this circular.
If the regulatory leverage ratio is reduced—as established by Circular 5/2026—compared to the previous period, the resulting WACC will be somewhat lower. This means that, on those 500 million euros of assets, the financial remuneration recognized by the CNMC will be less than in the 2021-2026 period, although the QE adjustment and the incorporation of future data in the debt cost can partially offset that reduction.
For investors valuing these companies by their regulated cash flows, the change in the regulatory WACC is a determining factor: a reduction of 50 basis points (0.5%) in the rate on a RAB of 500 million means 2.5 million euros less in annual recognized financial remuneration.
What should companies do now?
- Review regulatory financial models: Update valuation and financial planning models by incorporating the new remuneration rate set by the CNMC for 2027-2032 and the methodological changes from Circular 9/2025.
- Analyze the impact of the new leverage ratio: Evaluate how the reduction in the regulatory debt ratio affects the recognized WACC and, therefore, the regulated revenues expected for the period.
- Review financing strategy: If the recognized regulatory leverage is reduced, it is advisable to analyze whether the company's current capital structure remains optimal under the new framework.
- Incorporate the QE adjustment in projections: Ensure that valuation models correctly reflect the adjustment in the risk-free rate introduced by the new methodology.
- Consult with specialists in energy regulation: Since the circular establishes technical parameters with direct impact on the profit and loss account, it is advisable to have specialized advice to correctly interpret the resulting rate and its implications.
- Monitor complementary regulatory developments: The circular is part of the 2027-2032 regulatory review; additional developments from the Ministry for Ecological Transition may occur that affect other remuneration parameters.
Frequently asked questions
What is the financial remuneration rate for natural gas and why does it matter?
It is the percentage of profitability that the CNMC recognizes to regulated companies in the gas sector on their network assets (regulatory WACC). It directly determines the revenues that regasification, transport and distribution companies can obtain, and conditions the system costs that are passed on to consumer tariffs. Circular 5/2026 sets it for the 2027-2032 period.
What changes compared to the previous regulatory period (2021-2026)?
Three main changes: (1) the debt cost calculation now combines historical and future data, previously only historical data was used; (2) a QE adjustment is applied to the risk-free rate to correct the effect of ultra-low ECB rates; and (3) the regulatory leverage ratio is reduced, aligning with the electricity sector and European regulators. The reference methodology is CNMC Circular 9/2025.
When does CNMC Circular 5/2026 on natural gas come into force?
The circular was published in the BOE on September 18, 2026 and comes into force on January 1, 2027, coinciding with the start of the new 2027-2032 regulatory period. Its validity is six years.
Does this circular affect the gas tariffs paid by consumers?
Yes, indirectly. The financial remuneration rate determines the regulated costs of the gas system, which is one of the components of network access tariffs. A lower rate tends to moderate those regulated costs, although the final impact on the bill also depends on gas prices in wholesale markets and other factors.
Which companies are required to apply this circular?
All companies that carry out regulated activities in the Spanish gas sector: regasification companies (LNG plants), natural gas transport operators by pipeline, the gas system technical manager and natural gas distribution companies. The circular does not affect traders or companies operating exclusively in liberalized markets.
Official source
View complete regulation in official source (BOE-A-2026-19426)
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-2026-19426
