The Greek natural gas retail market concluded 2025 with market shares that remained largely consistent with the previous year, despite a notable uptick in competitive dynamics among suppliers. This competition has primarily emerged as companies strive to enhance their market presence across various customer segments, including residential, commercial, and industrial sectors. Zenith retained its position as the leading supplier with a share of 29.3%, slightly down from 29.5% in 2024. Aerio Attikis followed closely with a share of 26.9%, a decrease from 29.2%. Meanwhile, Protergia made significant gains, increasing its market share to 18.5% from 16%. Heron also experienced growth, rising to 11% from 10.6%. The Public Power Corporation (PPC) moved into fifth place with a share of 3.2%, surpassing DEPA, Enerwave, and NRG, while DEPA saw its share decline to 3.1%. Enerwave maintained a stable share of 3%, and NRG’s share edged down to 2.5%.
Despite only marginal changes in overall market shares, industry analysts have observed heightened competition, particularly within the business supply segment. Suppliers have been actively revising their pricing strategies and commercial terms to secure new contracts, contributing to a relatively stable market structure at the headline level. However, beneath this surface stability, customer switching and competitive dynamics are becoming increasingly pronounced.
Total gas consumption through distribution networks reached 13.05 TWh in 2025, reflecting an impressive year-on-year increase of 11.25%. In contrast, demand from heavy industry and compressed natural gas stations saw a decline of 13.53%. Within the industrial and large commercial segment, Protergia emerged as the dominant supplier with a substantial share of 36.9%, followed by Heron at 19.4%, Zenith at 18.7%, and Aerio Attikis at 12.1%. DEPA accounted for 7.1% of this segment, while NRG captured 2.2%. Enerwave and EFA Energy each held a share of 1.7%, with Volterra representing a minimal share of 0.2%.
<pIn the residential segment, Zenith continued to lead but experienced a decrease in its market share to 38.8%, down from 43.4%. Aerio Attikis followed with a share of 25.6%, while Protergia and Heron expanded their respective shares to 8.8% and 8.4%. PPC increased its presence to 8.3%, whereas Enerwave remained stable at 4.7%. NRG's share slipped to 3%, and EFA Energy improved its position to hold a share of 1.7%. Overall, these figures suggest that while the broader market structure remains stable, ongoing competitive pressures and shifts within specific segments are gradually transforming Greece’s retail gas landscape.
