In 2023, Naturgy was Spain's natural gas supplier company with the most clients, with a total of **** million customers. Ranking second that year was Endesa, with over *** million customers in total. By contrast, the company Fenie only had about * clients in 2023.
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Comisión Nacional de los Mercados y la Competencia. (June 24, 2024). Number of clients of the main natural gas suppliers in Spain in 2023, by tariff type [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved August 05, 2026, from /statistics/1321103/number-of-clients-of-the-main-natural-gas-suppliers-by-tariff-spain/
Comisión Nacional de los Mercados y la Competencia. "Number of clients of the main natural gas suppliers in Spain in 2023, by tariff type." Chart. June 24, 2024. ÌÇÐÄÆƽâ°æ. Accessed August 05, 2026. /statistics/1321103/number-of-clients-of-the-main-natural-gas-suppliers-by-tariff-spain/
Comisión Nacional de los Mercados y la Competencia. (2024). Number of clients of the main natural gas suppliers in Spain in 2023, by tariff type. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: August 05, 2026. /statistics/1321103/number-of-clients-of-the-main-natural-gas-suppliers-by-tariff-spain/
Comisión Nacional de los Mercados y la Competencia. "Number of Clients of The Main Natural Gas Suppliers in Spain in 2023, by Tariff Type." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 24 Jun 2024, /statistics/1321103/number-of-clients-of-the-main-natural-gas-suppliers-by-tariff-spain/
Comisión Nacional de los Mercados y la Competencia, Number of clients of the main natural gas suppliers in Spain in 2023, by tariff type ÌÇÐÄÆƽâ°æ, /statistics/1321103/number-of-clients-of-the-main-natural-gas-suppliers-by-tariff-spain/ (last visited August 05, 2026)
Number of clients of the main natural gas suppliers in Spain in 2023, by tariff type [Graph], Comisión Nacional de los Mercados y la Competencia, June 24, 2024. [Online]. Available: /statistics/1321103/number-of-clients-of-the-main-natural-gas-suppliers-by-tariff-spain/
