The Greek natural gas retail market concluded 2025 with market shares reflecting minimal changes from the previous year, despite a backdrop of heightened competition among suppliers. This competitive environment has prompted companies to adapt their strategies in order to capture a larger customer base across residential, commercial, and industrial segments. Zenith retained its top position with a market share of 29.3%, slightly down from 29.5% in 2024. Following closely was Aerio Attikis, which saw its share decline to 26.9% from 29.2%. Protergia, however, increased its market presence from 16% to 18.5%, while Heron also gained ground, rising to 11% from 10.6%. Public Power Corporation (PPC) moved into fifth place with a share of 3.2%, overtaking DEPA, Enerwave, and NRG.
Despite only minor shifts in overall market shares, industry analysts have noted a surge in competitive tactics, particularly within the business supply segment. Suppliers have revised their pricing strategies and commercial terms as they strive to secure new contracts, indicating a more aggressive approach to competition that has led to increased customer switching and evolving dynamics beneath the surface.
Total gas consumption through distribution networks reached 13.05 TWh in 2025, representing an impressive year-on-year increase of 11.25%. However, demand from heavy industry and compressed natural gas stations fell by 13.53%. In the industrial and large commercial sector, Protergia emerged as the leading supplier with a commanding share of 36.9%, followed by Heron at 19.4%, Zenith at 18.7%, and Aerio Attikis at 12.1%. DEPA accounted for a share of 7.1%, while NRG captured 2.2%. Enerwave and EFA Energy each held shares of 1.7%, with Volterra contributing a marginal 0.2%.
<pIn the residential segment, Zenith continued to lead but experienced a decline in its market share to 38.8% from a previous high of 43.4%. Aerio Attikis followed with a share of 25.6%, while Protergia and Heron expanded their footprints to reach shares of 8.8% and 8.4%, respectively. PPC's share rose slightly to 8.3%. Enerwave remained stable at 4.7%, whereas NRG slipped to a share of 3%. EFA Energy managed to increase its presence to hold a share of 1.7%. These figures suggest that while Greece’s broader retail gas market structure remains largely stable, competitive pressures are driving significant shifts within specific segments.
