Marubeni Shin Denryoku Concludes Off-site Corporate PPA with Keio Corporation
Marubeni Shin Denryoku and Keio Corporation signed an off-site corporate PPA to supply renewable energy, reducing Keio's CO₂ emissions by approximately 8,000 tons annually.
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- 📰 Published: March 31, 2026 at 23:00
Keio Corporation (Headquarters: Tama City, Tokyo; President & CEO: Satoshi Tomura; hereinafter "Keio Corporation") and Marubeni Shin Denryoku Corporation (Representative Director: Atsushi Suzuki; hereinafter "Marubeni Shin Denryoku"), a consolidated subsidiary of Marubeni Corporation, have concluded a comprehensive agreement, an "Off-site Corporate PPA*1" (hereinafter "this Agreement"), for the commencement of supplying renewable energy electricity derived from solar power plants exclusively for Keio Corporation.
Through this initiative, starting in April 2026, Marubeni Shin Denryoku will begin supplying renewable energy electricity from solar power generation facilities to "Keio Department Store Shinjuku Building," "Keio Shinjuku Oiwake Building," and "Keio FRENTE Shinjuku 3-chome Building" (hereinafter "Target Facilities"). By attaching tracking-enabled non-fossil certificates*2 to any insufficient electricity, it will be possible to substantially reduce approximately 8,000 tons of CO₂ emissions annually that were previously generated from the electricity consumption at the Target Facilities.
The Keio Group has set a long-term environmental goal of achieving carbon neutrality by fiscal year 2050 and has been working to reduce CO₂ emissions, including switching the electricity used in major hotels and commercial facilities in Tokyo to virtually renewable energy-derived electricity. Moving forward, the group will continue to promote initiatives for realizing a decarbonized society, such as steadily advancing energy-saving measures and considering the utilization of renewable energy-derived electricity.
Marubeni Shin Denryoku, in line with its parent company Marubeni Corporation's "GC2027" Mid-term Management Strategy, is promoting "Green Initiatives" and will contribute to the realization of a decarbonized and sustainable society through off-site corporate PPAs.
The company aims to supply approximately 5 million kW of renewable energy electricity widely to customers by fiscal year 2030.
*1 Off-site Corporate PPA: A Corporate PPA (Power Purchase Agreement) is a contract where a company purchases renewable energy from a power generator at a fixed price over a long period. It is gaining attention as an energy procurement method that can contribute to a company's CO₂ emission reduction. Among these, a scheme to procure electricity from remote generation facilities via the general transmission and distribution network is called an "Off-site Corporate PPA."
*2 Tracking-enabled Non-fossil Certificates: Certificates that prove the environmental value of non-fossil energy, with attribute information of the power plant (location, power source type, operation start date) attached.
Introduction of Off-site Corporate PPA
1. Scheme of this Initiative
During the contract period, Keio Corporation will receive approximately 4.35 million kWh of electricity annually from multiple solar power generation facilities exclusively arranged by Marubeni Shin Denryoku for Keio Corporation. By also attaching tracking-enabled non-fossil certificates to any insufficient electricity, all electricity used at the Target Facilities will be virtually derived from renewable energy.
2. Contract Overview
(1) Contract Type
Off-site Corporate PPA
(2) Power Source
Solar power generation facilities *AC: 2,400 kW
(3) Supply Start Date
April 1, 2026 (Wednesday)
(4) Contract Period
20 years
(5) Target Facilities
・Keio Department Store Shinjuku Building
・Keio Shinjuku Oiwake Building
・Keio FRENTE Shinjuku 3-chome Building
(6) CO₂ Reduction Effect
Approximately 8,000 tons of CO₂ annually (of which approximately 1,600 tons of CO₂ are derived from solar power plants)
*An emission factor of 0.000431 t-CO₂ is applied.
《Keio Department Store Shinjuku Building》
《Keio Shinjuku Oiwake Building》
《Keio FRENTE Shinjuku 3-chome Building》
Contact Information for this Matter
Marubeni Shin Denryoku Corporation, Renewable Energy Business Division
Phone: 03-3282-2350 E-mail: saiene@denki.marubeni.co.jp
【About Marubeni Shin Denryoku Corporation】
Company Name: Marubeni Shin Denryoku Corporation (a 100% owned consolidated subsidiary of Marubeni Corporation)
Establishment Date: January 2011
Representative: Atsushi Suzuki, Representative Director and President
Location: Marubeni Building, 1-4-2 Otemachi, Chiyoda-ku, Tokyo
Capital: 100 million yen
Business Activities: Electricity trading business and its agency, representation, brokerage, etc.
Company Website: https://denki.marubeni.co.jp/
【About Keio Corporation】
Company Name: Keio Corporation
Establishment Date: June 1948
Representative: Satoshi Tomura, Representative Director, President and Executive Officer
Location: 1-9-1 Sekido, Tama City, Tokyo
Capital: 59,023 million yen
Business Activities: Railway business, real estate leasing and sales business, etc.
Company Website: https://www.keio.co.jp/
Through this initiative, starting in April 2026, Marubeni Shin Denryoku will begin supplying renewable energy electricity from solar power generation facilities to "Keio Department Store Shinjuku Building," "Keio Shinjuku Oiwake Building," and "Keio FRENTE Shinjuku 3-chome Building" (hereinafter "Target Facilities"). By attaching tracking-enabled non-fossil certificates*2 to any insufficient electricity, it will be possible to substantially reduce approximately 8,000 tons of CO₂ emissions annually that were previously generated from the electricity consumption at the Target Facilities.
The Keio Group has set a long-term environmental goal of achieving carbon neutrality by fiscal year 2050 and has been working to reduce CO₂ emissions, including switching the electricity used in major hotels and commercial facilities in Tokyo to virtually renewable energy-derived electricity. Moving forward, the group will continue to promote initiatives for realizing a decarbonized society, such as steadily advancing energy-saving measures and considering the utilization of renewable energy-derived electricity.
Marubeni Shin Denryoku, in line with its parent company Marubeni Corporation's "GC2027" Mid-term Management Strategy, is promoting "Green Initiatives" and will contribute to the realization of a decarbonized and sustainable society through off-site corporate PPAs.
The company aims to supply approximately 5 million kW of renewable energy electricity widely to customers by fiscal year 2030.
*1 Off-site Corporate PPA: A Corporate PPA (Power Purchase Agreement) is a contract where a company purchases renewable energy from a power generator at a fixed price over a long period. It is gaining attention as an energy procurement method that can contribute to a company's CO₂ emission reduction. Among these, a scheme to procure electricity from remote generation facilities via the general transmission and distribution network is called an "Off-site Corporate PPA."
*2 Tracking-enabled Non-fossil Certificates: Certificates that prove the environmental value of non-fossil energy, with attribute information of the power plant (location, power source type, operation start date) attached.
Introduction of Off-site Corporate PPA
1. Scheme of this Initiative
During the contract period, Keio Corporation will receive approximately 4.35 million kWh of electricity annually from multiple solar power generation facilities exclusively arranged by Marubeni Shin Denryoku for Keio Corporation. By also attaching tracking-enabled non-fossil certificates to any insufficient electricity, all electricity used at the Target Facilities will be virtually derived from renewable energy.
2. Contract Overview
(1) Contract Type
Off-site Corporate PPA
(2) Power Source
Solar power generation facilities *AC: 2,400 kW
(3) Supply Start Date
April 1, 2026 (Wednesday)
(4) Contract Period
20 years
(5) Target Facilities
・Keio Department Store Shinjuku Building
・Keio Shinjuku Oiwake Building
・Keio FRENTE Shinjuku 3-chome Building
(6) CO₂ Reduction Effect
Approximately 8,000 tons of CO₂ annually (of which approximately 1,600 tons of CO₂ are derived from solar power plants)
*An emission factor of 0.000431 t-CO₂ is applied.
《Keio Department Store Shinjuku Building》
《Keio Shinjuku Oiwake Building》
《Keio FRENTE Shinjuku 3-chome Building》
Contact Information for this Matter
Marubeni Shin Denryoku Corporation, Renewable Energy Business Division
Phone: 03-3282-2350 E-mail: saiene@denki.marubeni.co.jp
【About Marubeni Shin Denryoku Corporation】
Company Name: Marubeni Shin Denryoku Corporation (a 100% owned consolidated subsidiary of Marubeni Corporation)
Establishment Date: January 2011
Representative: Atsushi Suzuki, Representative Director and President
Location: Marubeni Building, 1-4-2 Otemachi, Chiyoda-ku, Tokyo
Capital: 100 million yen
Business Activities: Electricity trading business and its agency, representation, brokerage, etc.
Company Website: https://denki.marubeni.co.jp/
【About Keio Corporation】
Company Name: Keio Corporation
Establishment Date: June 1948
Representative: Satoshi Tomura, Representative Director, President and Executive Officer
Location: 1-9-1 Sekido, Tama City, Tokyo
Capital: 59,023 million yen
Business Activities: Railway business, real estate leasing and sales business, etc.
Company Website: https://www.keio.co.jp/
FAQ
What is an Off-site Corporate PPA?
It is a contract where a company purchases electricity over a long period from a remote renewable energy power plant via the transmission and distribution network.
How much CO₂ will be reduced by this agreement?
Approximately 8,000 tons of CO₂ emissions are expected to be virtually reduced annually at Keio Corporation's target facilities.
Why did Keio Corporation adopt this PPA?
To promote the utilization of renewable energy and reduce CO₂ emissions towards achieving its carbon neutrality goal by fiscal year 2050.