Environment Environment

Promoting the Use of Clean Energy

Updated August 2026

Promoting the Use of Clean Energy

Expansion of renewable energy and introduction of environmentally friendly power generation technologies

Denka has been working to promote the use of renewable energy for over 100 years. We have developed technologies for generating renewable energy, primarily hydroelectric power, and technologies for making the most of this precious energy source in chemical manufacturing. Through the application of these technologies, we contribute to the conservation of the global environment and will further focus on our efforts to promote renewable energy, which is one of our strengths.

1. Long-term outlook for renewable energy (power generation capacity)

Our company is expanding its use of renewable energy, including solar power, based on hydroelectric power. In Management Plan “Mission 2030” we have set a maximum renewable energy output of 150 MW as a non-financial KPI and are promoting initiatives toward decarbonization. In recent years, we have been accelerating expansion by diversifying our procurement methods, including considering the introduction of on-site PPA (Power Purchase Agreement) methods at our domestic and international business sites. On the other hand, at Omi Plant, we have shut down the associated biomass power generation facility following our withdrawal from the cement business. Moving forward, taking these changes into account, we will strive to improve our power mix by achieving both stable supply and optimized composition.

Maximum output of renewable energy generation

2025 Fiscal Year (Actual)
:145MW
2030 Targets (Medium-term Goals)
:150MW

Power Source Mix Ratio (Fiscal 2025)

Item Scope Unit 2022年度 2023年度 2024年度 2025年度 Fiscal Year 2026
Targets
2030
Targets
Breakdown of Energy Consumption by Source Hydroelectric Non-consolidated sites % 32% 39% 33% 37% 36% -
Biomass Non-consolidated sites % 1% 1% 1% 0 0 -
Waste heat power generation Non-consolidated sites % 1% 1% 0 0 0 -
Solar power generation Non-consolidated sites % - - - 0.1% 0.1% -
Fossil fuels Non-consolidated sites % 21% 23% 23% 25% 24% -
Purchased electricity Non-consolidated sites % 45% 36% 43% 37% 40% -
Total Non-consolidated sites % 100% 100% 100% 100% 100% -
Breakdown of Energy Consumption by Source (energy/non-energy) Renewable energy electricity mix + electricity mix with non-fossil fuel certificates / Electricity consumption Non-consolidated sites % 33% 40% 33% 37% 36% 76%
In-house Power Generation Capacity (maximum output) hydroelectric power * Non-consolidated sites / Domestic & Overseas Key production facilites MW 140.29 140.29 140.29 140.29 140.29 140.29
Solar power generation (including sales outside of the FIT scheme) Non-consolidated sites / Domestic & Overseas Key production facilites MW 2.99 2.99 3.89 5.09 7.365 9.71
Waste heat power generation/Biomass Non-consolidated sites / Domestic & Overseas Key production facilites MW 11.1 11.1 11.1 0 0 0
Thermal power generation Non-consolidated sites / Domestic & Overseas Key production facilites MW 66.305 66.305 66.305 66.305 66.305 66.305
Total renewable energy generation capacity Non-consolidated sites / Domestic & Overseas Key production facilites MW 146.28 146.28 147.18 145.38 147.655 150
Total on-site power generation capacity Non-consolidated sites / Domestic & Overseas Key production facilites MW 220.7 220.7 221.6 212 214 216
Fiscal Year 2022 Energy Consumption Renewable energy consumption Non-consolidated sites MWh 530,387 519,619 473,146 518,853 493,116 -
Amount of non-renewable energy consumed Non-consolidated sites MWh 1,083,241 783,894 974,399 898,393 863,241 -
Total Non-consolidated sites MWh 1,613,628 1,303,513 1,447,545 1,417,246 1,356,357 -
Energy conservation Compared to previous year (Target: 99% compared to previous year) Non-consolidated sites % 101% 101.5% 98% 93.8% 99% compared to previous year 99% compared to previous year
  • ※Includes 50% of the hydroelectric power plants of the Kurobe River Power Company (50% owned by the Company)

2. Denka's hydroelectric power

For over 100 years, the Company has positioned hydroelectric power as an important management resource and has utilized it as the core of its in-house power generation. There are 17 hydroelectric power plants (including jointly funded companies) in total near the Omi Plant, boasting a total power generation capacity of approximately 140,000 kW, making it one of the largest scale in Japan. These power plants not only provide stable electricity supply but also contribute significantly to decarbonization as clean energy sources that emit no greenhouse gases.
In recent years, we have been working on the development of new power sources, including the commencement of operations at the New Omi River Power Plant in fiscal 2020 and the New Himekawa No.6 Hydroelectric Power Plant of Kurobegawa Electric Power Company in fiscal 2022, and have been expanding our power generation capacity. Going forward, we will continue to position hydroelectric power as the core of our power generation portfolio and promote its development and utilization.

hydroelectric power 17 locations in Japan, maximum output 140,290kW

  • ※As of March 31, 2026/Includes our share of joint ventures

New Omigawa Hydroelectric Power Plant (Started operation in 2021)New Omigawa Hydroelectric Power Plant (Started operation in 2021)

New Himekawa No.6 Hydroelectric Power Plant (Started operation in 2022)New Himekawa No.6 Hydroelectric Power Plant (Started operation in 2022)

3. Efforts for Energy Conservation

The Company promotes energy conservation through facility improvements and operational optimizations. To date, we have introduced high-efficiency gas turbines at the Omi Plant and Chiba Plant, and have been working to improve energy efficiency through large-scale capital investments.
In recent years, with large-scale projects becoming limited, we have been re-examining energy usage at each of our business sites and strengthening improvements by identifying individual themes and building them up.
Going forward, we will continue to combine our daily improvement activities with facility updates to achieve both energy reductions and increased productivity.

Gas turbine power generation facility at Omi Plant that commenced operation in 2020Gas turbine power generation facility at Omi Plant that commenced operation in 2020

Gas turbine power generation facility at Chiba Plant that commenced operation in 2022Gas turbine power generation facility at Chiba Plant that commenced operation in 2022

4. Initiatives for Solar Power Generation

The Company is promoting the introduction of solar power generation at its business sites in Japan and overseas to expand the introduction of renewable energy. In fiscal 2025, a solar power generation system (approximately 1.2 MW) using the on-site PPA method will start operation at the Chiba Plant. Furthermore, the Company is considering new introductions using the on-site PPA method at several sites in Japan and overseas, and will promote the expansion of solar power generation and the decarbonization of electricity by selecting the optimal introduction methods according to the site conditions and power demand of each business site.

Denka Advanced Materials Vietnam Plant Solar PanelsDenka Advanced Materials Vietnam Plant Solar Panels

Solar panels at Chiba PlantSolar panels at Chiba Plant

Certification of special measures for the surcharge based on the Renewable Energy Special Measures Act

Our company and Denka Kojundo Gas Kabushiki Kaisha ※ submit energy-saving investment plans to the Minister of Economy, Trade and Industry and implement these plans in order to receive the special measures for the surcharge system based on the Act on Special Measures Concerning the Use of New Energy Sources.

  • ※Denka Kojundo Gas Kabushiki Kaisha
    1, Shinkai-machi, Omuta, Fukuoka, Japan (within Omuta Plant)
    Established: October 16, 1984
    Capital: 500 million yen
    Ownership ratio: 60% (consolidated subsidiary)
    Business description: Manufacturing and sales of various gases and liquefied gases

In-house power generation facilities plants and maximum output

hydroelectric power plant (map)

  • ※As of August 2025, including Denka's ownership of output from hydroelectric power plants owned by a joint venture

hydroelectric power plant (map)

Private power plants and their maximum output (as of the end of March 2026)
Facilities Map   2023年度 2024年度 2025年度
Maximum output (kW) Company's
maximum output (kW)
Maximum output (kW) Company's
maximum output (kW)
Maximum output (kW) Company's
maximum output (kW)
Hydroelectric 1 Omigawa 3,300 3,300 3,300   3,300   3,300   3,300  
2 Kotagikawa 5,200 5,200 5,200   5,200   5,200   5,200  
3 Mesh 28,400 28,400 28,400   28,400   28,400   28,400  
4 Oosogawa 9,800 9,800 9,800   9,800   9,800   9,800  
5 YOKOGAWA 1ST 10,000 10,000 10,000   10,000   10,000   10,000  
6 YOKOGAWA 2ND 16,000 16,000 16,000   16,000   16,000   16,000  
7 KAIKAWA DAIICHI 3,800 3,800 3,800   3,800   3,800   3,800  
8 Mikawa 2nd 4,700 4,700 4,700   4,700   4,700   4,700  
9 Kaigawa 3rd 2,600 2,600 2,600   2,600   2,600   2,600  
10 KAIKAWA YONTH 990 990 (FIT) 990   990 (FIT) 990   990 (FIT)
11 HIMEKAWA 6TH 26,000 Kurobe Electric Power Co. 13,000 26,000 Kurobe Electric Power Co. 13,000   26,000 Kurobe Electric Power Co. 13,000  
12 Takiue 15,000 Kurobe Electric Power Co. 7,500 15,000 Kurobe Electric Power Co. 7,500   15,000 Kurobe Electric Power Co. 7,500  
13 Mizuki 5,000 Kurobe Electric Power Co. 2,500 5,000 Kurobe Electric Power Co. 2,500   5,000 Kurobe Electric Power Co. 2,500  
14 Sasakura No. 2 10,200 Kurobe Electric Power Co. 5,100 10,200 Kurobe Electric Power Co. 5,100   10,200 Kurobe Electric Power Co. 5,100  
15 Kita-Kotani 10,700 Kurobe Electric Power Co. 5,350 10,700 Kurobe Electric Power Co. 5,350   10,700 Kurobe Electric Power Co. 5,350  
16 New Seihai River 8,100 8,100 (FIT) 8,100   8,100 (FIT) 8,100   8,100 (FIT)
17 Shinhimekawa No. 6 27,900 Kurobe Electric Power Co. 13,950 (FIT) 27,900 Kurobe Electric Power Co. 13,950 (FIT) 27,900 Kurobe Electric Power Co. 13,950 (FIT)
Hydroelectric Total maximum output   187,690 140,290 187,690   140,290   187,690   140,290  
Total in-house consumption (excluding output for FIT)   - 117,250 -   117,250   -   117,250  
Solar Power   Shibukawa 1,990 1,990 (FIT) 1,990   1,990 (FIT) 1,990   1,990 (FIT)
  Isezaki 1,000 1,000 (FIT) 1,000   1,000 (FIT) 1,000   1,000 (FIT)
  Chiba               1,200 (PPA) 1,200 (PPA)
  DAV         900 (PPA) 900 (PPA) 900 (PPA) 900 (PPA)
Solar Total Maximum Output   2,990   2,990   3,890   3,890   5,090   5,090  
Natural gas   Omi 14,000 14,000 14,000   14,000   14,000   14,000  
Waste heat/biomass boiler   Omi Cement 11,100   11,100   11,100   11,100   0   0  
Gas turbine/Co-generation   Omi (Tomi) 34,685 34,685 34,685   34,685   34,685   34,685  
  Chiba 16,620 16,620 16,620   16,620   16,620   16,620  
Diesel   Shibukawa 1,000 1,000 1,000   1,000   1,000   1,000  
Thermal Total Maximum Output   77,405   77,405   77,405   77,405   66,305   66,305  
Total power generation capacity (including FIT)   220,685     221,585       211,685  
Total Maximun Output for In-house Consumption   194,655     195,555       185,655  
DFF Inc., Denka Company Limited CSR and Public Relations Office, Denka Company Limited IR Office, Seiwa Business Link
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