Tariffs and prices – natural gas

Annually, ERSE approves natural gas tariffs and prices for a time period named as year gas (October to September of the following year).

ERSE defines 'tariffs and prices' as:

  • Tariffs: regulated tariffs that reflect all the costs of each regulated activity. For these, ERSE defines the allowed revenues; all end user consumers, both in the regulated and liberalized market, pay these costs.
  • Prices: The prices of regulated services are associated with mandatory services (example: restoration of natural gas supply or extraordinary meter readings) and are paid only by consumers who request them.

Each regulated tariff reflects the costs of each regulated activities.


Tariff Regulation defines either the allowed revenue methodology, for each regulated activity, or both tariffs and its respective structure.

Depending on whether the consumer is in the regulated market or in the liberalized market, a different set of ERSE regulated tariffs apply. The differences between the regulated and the liberalized markets in the consumers’ total invoice are as follows:

All consumers pay the network access tariff, regardless of whether they are in the regulated market or in the liberalized market. Access tariffs reflect the cost of infrastructures and all services used by all consumers in a collective manner. This tariff results from the sum of the global technical system operation tariff, transmission network tariff, distribution networks tariffs and supplier switching operation tariff. ERSE defines all these tariffs.

Consumers, who still are in the regulated market pay the energy tariff and the supply tariff, set by ERSE. In the liberalized market, each supplier defines freely the corresponding value, being in competition with other suppliers.

The government is responsible to define VAT and Taxes and both are equal either in the regulated market or in the liberalized market.

Known more about all commercial offers in the liberalized market in the natural gas commercial offers Bulletin (PT).

To compare the prices of electricity and natural gas commercial offers use the ERSE energy price simulator.

Every six months, ERSE publishes information (PT) comparing energy prices in Portugal with other European Union countries prices.

Social Tariff

Economically vulnerable consumers with an annual natural gas consumption less than 10 000 m3 (in the low‑pressure distribution network), are entitled to a social tariff discount in their respective network access tariff. This discount is equal for all consumers, whether they are in the regulated market or in the liberalized market.

For consumers in the liberalized market, ERSE defines the social tariff discount applied on the network access tariff. When the consumer is entitled to the social tariff, the supplier must apply this discount to his end-user tariffs.

For consumers who are still in the regulated market, ERSE defines an end-user social tariff, applied by the supplier of last resort (SLR).

ERSE made available a calculator to check the social tariff discount on consumers' energy invoices.

The government division of Energy and Geology (DGEG) is responsible for identifying the beneficiaries of the social tariff. If you have any questions or complaints about the social tariff entitlement, please contact DGEG.

To know more about the social tariff on natural gas consult this FAQ (PT).


Current year

Gas year 2020-2021

ERSE approved for the gas year 2020-2021, the natural gas tariffs, to be in force from October 2020 to September 2021, through the ERSE Directive No. 11/2020, of June 1 (PT), which is awaiting publication in the Official Journal.

The tariff setting is based on the document "Natural Gas Tariffs and Prices for the year 2020-2021", which includes 3 annexes, which analyze in detail the allowed revenues of the regulated activities, the demand for natural gas and the tariff structure. The disclosed documentation also includes the opinion of the Natural Gas Sector Tariff Council and ERSE's comments on that Opinion.


Gas year 2019-2020

Natural gas tariffs and prices from October 2019 to September 2020 (year gas 2019-2020), are published in Directive 12/2019, July 1st.

ERSE presents all the information regarding tariff and prices setting on the document “Tariffs and Prices of Natural Gas for the year 2019-2020 gas and Parameters for the 2020-2023 Regulation Period (pt)”. This document includes three attachments analysing in detail the allowed revenues for each regulated activity, the natural gas demand and the tariff structure.

Since the year gas 2019-2020 partially overlaps with the new regulatory period (January 2020 to December 2023), the available documentation also includes the regulatory parameters for the period 2020-2023 and a performance analysis of regulated companies.

ERSE Directive no. 10/2020, of June 1st, which is awaiting publication in the Official Journal, carries out an extraordinary review of the Energy tariff applicable by the Retail Last Resort Supplier (CURr). The approved tariffs will enter into force on 1 July 2020.

Transmission tariffs transparency

The Commission Regulation (EU) 2017/460 establishes a network code on harmonised transmission tariff structures for natural gas, including rules on the application of a reference price methodology, the associated consultation and publication requirements as well as the calculation of reserve prices for standard capacity products.

Information required under article 29 and article 30 of the network code:

Article 29

Information to be published before the annual yearly capacity auction in 2020-2021 (*)

Art. 29 (a)
Firm capacity products

Information for standard capacity products for firm capacity (reserve prices, multipliers, seasonal factors, etc.)

Art. 29 (b)
Interruptible capacity products

Information for standard capacity products for interruptible capacity (reserve prices and an assessment of the probability of interruption)

(*) Updated in 1st June 2020.

Article 30

Information to be published before the tariff period in 2019-2020 (October 2019 - September 2020) (*)

Art. 30 (1)(a)
Technical parameters
Information on parameters used in the applied reference price methodology related to the technical characteristics of the transmission system.
Art. 30 (1)(b)(i,ii)
Allowed revenues and changes
Information on the allowed revenue, including the changes compared to the previous period
Art. 30 (1)(b)(iii)
Revenue parameters

Information related the following Parameters: types of assets, cost of capital, capital and operational expenditures, incentive mechanisms and efficiency targets, inflation indices

Art. 30 (1)(b)(iv,v)
Transmission service revenue 
Information on the transmission services revenue including capacity-commodity split, entry-exit split and intra-system/cross-system split
Art. 30 (1)(b)(vi,vii)
Reconciliation mechanism and auction premium
Information related to the previous tariff period regarding the reconciliation of the regulatory account and the auction premium.
Art. 30 (1)(c)
Transmission and non-transmission tariffs
Information on transmission and non-transmission tariffs accompanied by the relevant information related to their derivation
Art. 30 (2)(a)
Tariff changes and trends
Information on transmission tariff changes and trends
Art. 30 (2)(b)
Simplified tariff model
Information about the used tariff model and an explanation of how to calculate the transmission tariffs applicable for the prevailing tariff period

(*) Will be updated until September 2020 with 2020-2021 gas year information.


Transmission Tariffs Transparency - Previous years

2019-2020| 2018/2019 | 2017/2018

Historical information on revenues and transmission tariffs, in accordance with paragraph 1, al. (b) Article 30 of Commission Regulation (EU) 2017/460.

Tariff period 2019-2020

Tariff period 2018-2019


Tariff period 2017-2018