Gashanes, which were established to meet the lighting and heating needs of Dolmabahçe and Beylerbeyi Palaces, shared their surplus production with the outside to illuminate the surrounding districts. Thus, the lighting of Istanbul with gas started and the public lighting of its streets was first possible with gas. After the Dolmabahçe and Kuzguncuk gasworks established in the middle of the 19th century, Yedikule and Hasanpaşa Gashouses were put into service in the last quarter of the century. The use of gas in Istanbul, in its journey that has passed through many stages and reached a century and a half, experienced the biggest leap over the rate of increase in the number of subscribers after 1945, when Hasanpaşa and Yedikule Gasworks were nationalized, and entered a downward trend after 1965. The working range was determined between 1945-1967 after the nationalization, in which the use of coal gas was intense. Over the inter-year performance of the enterprise, the gas consumption of the society has been evaluated and the economic income-expenditure balance has been compared. It is aimed to determine the profit or loss of the gas company and to address the reasons.