[3] The company is the country's main supplier and responsible for producing around 40% of the total natural gas consumption in Romania.

[7] On the present-day territory of Romania, the first natural gas deposit was discovered in 1909, in Sărmășel, Mureș County (then in Austria-Hungary), further to geological researches on potassium salts.

The American success in the exploitation and usage of natural gas determined the foundation of Societatea Maghiară de Gaz Metan UEG (Hungarian Methane Company) by the Hungarian Ministry of Finances and Deutsche Bank whose scope of activity was the exploration, exploitation, transmission, distribution and use of natural gas in certain regions within Transylvania.

[9] After the unification of Transylvania and Romania in 1919 the Direcția gazului natural company is established at Cluj affiliated to the Ministry of Industry and Commerce in Bucharest, which later in 1925 was renamed to Societatea Națională de Gaz Metan SONAMETAN (National Methane Company).

The first underground storage facility was operated in 1961, and in 1976 the company's largest natural gas output was realised 29.8 cubic kilometers.

[16] Romgaz finally debuted the planned percentage of shares on Romanian and London stock exchanges in November 2013.

[19] In the same year, Gazprom negotiated the establishment of a joint-venture with Romgaz, to build and operate storage facilities for up to two billion cubic meters of gas.

[20] In 2010, Templeton which since 2009 manages the Romanian national compensation fund Fondul Protrietatea, threatened legal action against the Romanian government, which attempted to use their shareholder superiority to channel money from the company to compensate for a national budget deficit.

[27] In 2015, Romgaz announced that the company would expand their conventional gas operations and not invest into shale-gas technologies and exploration for now.

General Director Virgil Metea stated: "Let's say in the medium term, up to five years, we do not plan shale gas (exploration).

[31][32] In 2018, news about a potential partnership between Romgaz and Azeri group Socar in different Black Sea offshore gas and pipeline projects surfaced.

[33] In November 2018, the company announced that it has ordered a feasibility study for a possible new gas power plant with a 400-500 MW capacity, to be erected in Mintia, near Deva.

[47] The company operates several large natural gas fields like Bazna, Brodina, Caragele, Copșa Mică, Deleni, Filitelnic, Grădiștea, Laslău Mare, Mamu, Roman-Secuieni, Șamșud, Sărmașel, Sighișoara, and Zau de Câmpie, with combined reserves exceeding 4.351 TCF (112 km3).

[52] The storage facilities are located in Sărmăşel and Cetatea de Baltă in Transylvania, Bilciurești, Bălăceanca, Urziceni, and Ghercești in Southern Romania.

[55] The company also runs experimental power generation projects at gas wells, that are located to far away to make a connection to Romania's national transmission system feasible.

The sum was invested into the medical and health sector, into education, social and sports clubs and other sponsorships.