June 2026
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Largest Energy Production Public Companies in Japan
Benchmark revenue and EBITDA valuation multiples for public comps like
Inpex, ENEOS Holdings, Kansai Electric Power, Chubu Electric Power and Tokyo Gas.
 | Headquartered in Tokyo, Inpex was founded in 2008 through a merger with Teikoku Oil. The precursor Inpex began life in 1966 as North Sumatra Offshore Petroleum Exploration and discovered the Attaka field in Indonesia in 1970 before acquiring the ADMA Block offshore the United Arab Emirates in 1973 and then discovering the Kashagan oilfield in Kazakhstan and Ichthys and Abadi gasfields in the Timor Sea in 2000. Teikoku Oil was founded in 1941 as a semigovernment entity and discovered Japan’s largest natural gas reserves in Minami-Nagaoka in 1979. Inpex is Japan’s largest hydrocarbon producer, with oil and gas projects across multiple continents. It produces around 230 million barrels of oil equivalent per year and has 6.2 billion barrels of oil equivalent in proven and probable reserves. | $23 | +79% | $27B | $30B | 2.3x | 3.2x | ||
| ENEOS Holdings Inc is engaged in the energy and materials business through its group companies. The company operates six reportable segments: Petroleum Products and Other, Oil and Natural Gas Exploration and Development, Functional Materials, Electricity, Renewable Energy, and Others. Its operations include petroleum refining and sales, oil and gas exploration, production of synthetic and special rubber, power generation, and renewable energy activities such as wind and solar power. The Others segment covers asphalt paving, civil engineering, construction, and real estate rental businesses. It generates the majority of its revenue from the Petroleum Products segment. | $8 | +79% | $22B | $31B | 0.4x | 10.1x | ||
| Kansai Electric Power Co Inc is a Japan-based company that provides energy and information technology solutions. The company operates in four business segments. The Energy segment offers electricity, gas, and utility solutions. The Information and Communications segment provides comprehensive communication services. The Lifestyle/Business Solutions segment delivers consumer and business-related services. The Power Transmission and Distribution segment ensures a safe and reliable electricity supply from a neutral and fair standpoint. It generates the majority of its revenue from the Energy business segment. | $15 | +35% | $16B | $35B | 1.3x | 5.5x | ||
| Chubu Electric Power Co Inc is a Japanese electric utility firm that operates in the Chubu region in central Japan. The company operates through three segments. The JERA segment handles upstream fuel procurement, power generation, and the sale of electricity and gas. The Mirise segment engages in electricity and gas sales along with related services. The Power Grid segment provides power network services. The Others segment covers renewable energy subsidiaries, business creation and global business divisions, nuclear power, administrative functions, and other affiliated companies. It generates the majority of its revenue from the Mirise segment. | $17 | +56% | $13B | $29B | 1.3x | 10.1x | ||
| Tokyo Gas Co Ltd is a Japanese utility company involved in the production, generation, and supply of natural gas and electricity. Tokyo Gas segments its operations into Gas, Electric Power, Overseas, and Other business units. The company's Gas division generates the vast majority of its total revenue through the supply and sale of natural gas to, namely, the Tokyo metropolitan area and other Japanese urban areas. Tokyo Gas' supply of natural gas is fairly evenly distributed amongst residential, commercial, industrial, and power generation customers. The company's Electric Power business also represents a significant income stream. This division operates a portfolio of cogeneration and natural gas-fired thermal power plants primarily located in the Tokyo area. | $39 | +29% | $13B | $19B | 1.2x | 7.7x | ||
| Idemitsu Kosan Co Ltd engages in a variety of activities globally that include petroleum products, oil exploration and production, coal, and other businesses. The company operates through five segments. The Basic Chemicals segment makes and sells olefins and aroma products. Electricity/Renewable Energy covers thermal, solar, and wind power generation, electricity sales, and solar business. Fuel Oil handles production, trading, and import/export of refined petroleum. The Highly Functional Materials segment includes lubricants, chemicals, electronic materials, paving materials, and agri-bio. The Resource segment explores, develops, and sells crude oil, natural gas, and coal. Others cover insurance and intra-group services. It generates the majority of its revenue from the Fuel oil segment. | $9 | +59% | $11B | $18B | 0.3x | 10.1x | ||
| Tokyo Electric Power Co Holdings is a Japan-based company engaged in the generation and distribution of electric power. The company operates through five segments. The Energy Partner segment provides optimal total solutions, customer services, and low-cost power procurement. The Fuel & Power segment focuses on thermal power generation, fuel procurement, and related investments. The Holdings segment provides management support, shared services, and oversees nuclear power operations. The Power Grid segment handles electricity transmission, transformation, distribution, and related facility construction and maintenance. The Renewable Power segment generates and sells renewable energy, manages facilities, and develops new renewable projects in Japan and overseas. | $3 | +12% | $5B | $39B | 0.9x | 9.9x | ||
| Kyushu Electric Power Co Inc is a Japan-based company mainly engaged in the electric power business. Its operating segments include ICT Service Business, Other Energy Service Business, Overseas Business, Power Generation and Sales Business, Power Transmission and Distribution Business, Urban Development Business, and Others. It generates the majority of its revenue from the Power generation and sales business segment, whose main business is the power generation and retail electricity business in Japan. | $10 | +24% | $5B | $23B | 1.5x | 7.9x | ||
| Electric Power Development Co Ltd is a Japanese electric utility company involved in the generation, transmission, distribution, and retail sale of energy. The company operates through four segments. The Power Generation segment covers hydro, thermal, and wind power generation, along with maintenance, operation, and electricity sales. The Power Transmission and Transformation segment focuses on grid and network operations. Electricity-related Businesses support generation and transmission activities to ensure smooth and efficient operations. The Overseas Business engages in power generation and related services abroad. It generates the majority of its revenue from the Power Generation Business segment. | $24 | +58% | $4B | $14B | 1.7x | 7.5x | ||
| Cosmo Energy Holdings Co Ltd is engaged in the oil, petrochemical, oil exploration and development, and renewable energy businesses. The group operates through four reportable segments: the Petroleum Business, which produces and sells gasoline, naphtha, kerosene, diesel, heavy oil, crude oil, lubricants, LPG, asphalt, and related products; the Petrochemical Business, which manufactures and sells petrochemical products such as ethylene, mixed xylene, paraxylene, benzene, toluene, and solvents; the Oil E&P Business, which develops, produces, and sells crude oil; and the Renewable Energy Business, which generates and supplies electricity produced from wind power. It generates the majority of its revenue from the Petroleum business segment. | $23 | +18% | $4B | $6B | 0.4x | 5.4x | ||
| Air Water Inc is a diversified conglomerate engaged in the supply of industrial gases and various other businesses and services. The company operates through five segments. The Agri & Foods segment covers the processing and distribution of fruits and vegetables, frozen foods, meat products, and contract manufacturing of beverages. The Digital & Industry segment focuses on industrial gases, electrical, and functional materials. The Energy Solutions segment deals with LP gas, kerosene, and related equipment. The Health & Safety segment provides medical gases, dental and protective materials, hospital equipment, and home medical care services. The Other Businesses segment includes logistics, salt production, overseas industrial gas operations, biomass power, and high-output UPS solutions. | $16 | -- | $4B | $6B | 0.8x | 6.8x | ||
| Tohoku Electric Power Co Inc is engaged in the supply and distribution of electricity. The company operates through two reportable segments: Power Generation and Sales, which provides stable electricity from thermal, nuclear, and renewable energy sources and offers electricity retail and related services; and Power Transmission and Distribution, which provides neutral and fair electricity network services. It generates the majority of its revenue from the Power generation and sales business segment. | $6 | -6% | $3B | $18B | 1.1x | 6.0x | ||
| Chugoku Electric Power Co Inc is a Japanese electric utility company mainly serving the industrial region of Chugoku on the western end of Japan’s main island of Honshu. The company is involved in the generation, transmission, distribution, and supply of energy. Chugoku Electric owns and operates a portfolio of thermal, nuclear, and hydroelectric power plants located mainly in its home region. While majority of these energy-generating facilities are hydroelectric, the vast majority of the company’s total energy production comes from its thermal sites. It generates revenue mainly from the sale of electric power to commercial and industrial customers in Chugoku. The company also owns assets and offers consulting and training services throughout Southeast Asia. | $5 | +19% | $2B | $18B | 1.9x | 11.4x | ||
| West Holdings Corp is engaged in the solar power generation. The company generates solar power for municipalities, residential and industrial use. Its business activities are divided into different divisions including Stadtberg business, Solar power generation for municipalities, special high-pressure solar power generation, Industrial solar power generation, Residential solar power generation, O & M (operation and management), Sales of electricity and Esco Business. Stadtberg division provides consulting and operation support for infrastructure services centered on renewable energy. O & M division monitors the photovoltaic power plant and maintains the maximum amount of power generation. Its Esco division provides various energy-saving measures. | $15 | +45% | $604M | $927M | 3.0x | 12.8x | ||
| Mitsuuroko Group Holdings Co Ltd is a Japan-based company. The company is involved in Energy business, Real estate business, Electric power business, Leasing business, Beverage business and Business Support business. | $11 | -- | $602M | $567M | 0.3x | 4.6x | ||
| Shizuoka Gas Co Ltd is engaged in production, supply and sale of City gas, sale of Gas Appliances, and contract for Gas related construction work. | $7 | -- | $563M | $525M | 0.4x | 3.4x | ||
| Median | $13 | +35% | $5B | $18B | 1.1x | 7.6x |
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