Reducing the Carbon Intensity of fuels
Idemitsu Kosan is working to provide a stable supply of diverse, environmentally friendly, low-carbon energy in order to realize the energy transition.
SAF (Sustainable Aviation Fuel)
In order to achieve the goal set by the ICAO (International Civil Aviation Organization) as a measure against climate change, which is to "reduce CO₂ emissions from 2021 onward to the level of CO₂ emissions in 2019," the international air transport industry is considering specific measures. Sustainable Aviation Fuel (SAF) is one of the means to be introduced and utilized, and its adoption is highly anticipated.
Our company is working to secure raw materials and transportation routes in order to establish a domestic supply system for SAF by 2030.
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As of March 27, 2026
Synthetic fuel
synthetic fuel are liquid fuels produced by synthesizing CO₂-free hydrogen and CO₂. Although they emit CO₂ when used as fuel, they are a next-generation energy source that can be considered to hardly increase the amount of CO₂ in the atmosphere because they use CO₂ itself as a raw material.
Our company is working to establish a supply system for "e-methanol," a type of synthetic fuel. Not only can e-methanol be used directly as marine fuel, but it can also be used as a raw material to manufacture jet fuel, gasoline, and chemical raw materials, thus contributing to the decarbonization of many sectors.
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As of March 27, 2026
Click here for our initiatives including SAF and synthetic fuel
Biofuels
Biofuels are a form of renewable energy produced from resources such as plants, food waste, agricultural residues, and waste materials. Because the plants used as raw materials absorb CO₂ from the atmosphere during their growth, biofuels are regarded as carbon-neutral energy sources.
Our company is working to promote the social implementation of various biofuels, including Renewable Diesel (RD)—a promising alternative to conventional diesel fuel—B5 Diesel, which contains up to 5% biodiesel, and Bio Heavy Oil for marine use, which similarly blends biodiesel.
Carbon Offset fuel
A carbon credit refers to a right issued for the reduction effects of CO₂ and other greenhouse gases achieved through activities such as forest conservation, reforestation, and the introduction of energy-saving equipment by companies. During the transition period toward decarbonization, our company contributes to our customers’ carbon offset efforts by supplying fuels bundled with carbon credits to compensate for CO₂ emissions that are difficult for them to reduce.
As part of this initiative, we offer two types of products: “Idemitsu Carbon Offset Fuel,” which includes voluntary carbon credits (credits issued by private sectors or NGOs), and “Idemitsu Carbon Offset Fuel J,” which includes J-Credits (government-certified credits) that can be used under the Act on Promotion of Global Warming Countermeasures for calculating, reporting, and disclosing greenhouse gas emissions. In particular, as initiatives toward decarbonization accelerate through frameworks such as the GX League, the value of fuels with J-Credits is increasing. “Idemitsu Carbon Offset Fuel J” serves as an energy solution that simultaneously achieves environmental measures and enhances corporate value, supporting decarbonized management. By selecting the appropriate product according to each use case, we help fuel users advance their decarbonization efforts and improve their corporate value.