by Oil Type (Mineral (Naphthenic, Paraffinic), Silicone, Bio-based), Application (Transformer, Switchgear, Reactor), End User (Transmission & Distribution, Power Generation, Railways & Metros), and Region - Global Forecast to 2030", published by MarketsandMarkets™, the global Transformer Oil Market size is expected to grow from an estimated USD 1.9 billion in 2021 to USD 3.3 billion by 2030, at a CAGR of 6.5%. The expansion of electric grids in developing countries and the modernization of the electric grids in the developed economies are driving the Transformer Oil Market. Mineral oil: The largest segment of the Transformer Oil Market, by oil type The market has been segmented by oil type into mineral oil, silicone and bio-based. The mineral oil segment is expected to have the largest market share and is projected to grow at the highest rate during the forecast period. Mineral oil is mainly used for cooling and insulation purposes in transformers, reactors, and switchgears. It is also used for heat dispersion and to protect the transformer's internal windings. Mineral oil is further segmented into naphthenic and paraffinic oil, and a majority of the existing and new transformers manufactured use mineral oil as the insulation fluid. The demand for mineral oil is expected to grow during the forecast period because of its low cost index and easy availability compared to other transformer oils.