September 16, 2022
  • Rakuten Mobile, Inc.
  • Rakuten Energy, Inc.

Rakuten Mobile, Rakuten Energy and PHOTON CAPITAL reach agreement to supply base stations with electricity from renewable energy sources

- Offsite PPA to be utilized to supply renewable electricity to certain base stations

Tokyo, September 16, 2022 - Rakuten Mobile, Inc., Rakuten Energy, Inc. and PHOTON CAPITAL LLC today announced an agreement to supply Rakuten Mobile’s base stations with electricity from renewable sources from 2023. Rakuten Energy will utilize an offsite-type corporate PPA (offsite PPA, power purchase agreement) to supply Rakuten Mobile base stations with electricity generated by photovoltaic power (PV) plants held by Clean Energy 2 LLC (SPC), which will receive equity from the PHOTON Sustainable Solar Investment Limited Partnership operated by PHOTON CAPITAL.

Going forward, Rakuten Mobile and Rakuten Energy plan to expand the initiative to supply its base stations with renewable electricity nationwide to accelerate the Rakuten Group’s activities to realize a carbon neutral society*1 and reduce emissions of greenhouse gases.

  • Diagram of the renewable energy supply through the offsite PPA

An offsite PPA is a long-term power supply agreement in which a generator builds renewable power stations in remote locations for a specific customer, and transmits the electricity generated by the equipment over the grid to the customer’s facilities. As a new renewable power station is built, renewable power generation capacity increases. Therefore, offsite PPAs are considered to have “additionality,” and the potential to contribute to climate change mitigation more effectively*2. In addition, the 100% renewable electricity procured through offsite PPAs is not part of the Feed-in Tariff (FIT) system*3.

Based on the agreement, Rakuten Energy will utilize an offsite PPA and procure renewable electricity from SPC’s PV power plants which will be built nationwide and supply it to certain Rakuten Mobile base stations from 2023. Any shortage of electricity from the renewable sources or night-time electricity will be supplied from Rakuten Energy’s “REco Plan” virtually renewable electricity supply services for enterprises*4. This is expected to reduce greenhouse gas emissions*5 by approximately 1,765 tons per year*6.

In addition to trials of installations of solar panels onto base stations, Rakuten Mobile is also looking into the efficient and balanced use of both onsite and offsite PPAs to efficiently use renewable energy in its base stations. Going forward, the operator plans to expand its use of renewable electricity in its base stations and carry out initiatives aimed at reducing greenhouse gas emissions from its network equipment.

Rakuten Energy is carrying out a variety of initiatives to realize a sustainable society. These include “REco Plan” and the J-Credit trading system “Rakuten Energy Trading System (REts)*7” to support its customers in their efforts to decarbonize and achieve carbon neutrality. In addition, in the “Rakuten Denki” power supply plan for individual customers, customers can receive Rakuten Points for saving energy, contributing to decarbonization and stabilization of the electricity supply. By securing and supplying electricity through the offsite PPA, Rakuten Energy aims to further promote measures against climate change.

PHOTON CAPITAL is engaged in development of and investment in PV power businesses both in Japan and overseas, while emphasizing harmony with the surrounding environment and securing long term safety and stability of the PV plants. In September 2021, the company established a fund of which the core investment target is non-FIT PV power plants. Following the original intentions of the fund, this investment to PV plants through SPC which will start operation in 2023 is expected to contribute to achieving the targets of the Strategic Energy Plan, which includes maximum installation of renewable energy for 2030. With the aim to become a leading company in the non-FIT PV generation business, PHOTON CAPITAL will continue to develop and operate both domestic and overseas PV power plants, and strive to achieve a sustainable society.

About Rakuten Mobile, Inc.

Headquarters: Rakuten Crimson House, 1-14-1 Tamagawa, Setagaya-ku, Tokyo


  • Hiroshi Mikitani, Representative Director and Chairman
  • Tareq Amin, Representative Director and CEO
  • Shunsuke Yazawa, Representative Director and President

Number of employees: 4,621 (as at January 1, 2022)

Business description: Telecommunications business based on the Telecommunications Business Act and other communications businesses

Establishment: January 10, 2018


About Rakuten Energy, Inc.

Headquarters: Rakuten Crimson House, 1-14-1 Tamagawa, Setagaya-ku, Tokyo

Representative: Kazuhiro Suzuki, Representative Director and President

Number of employees: 96 (as at January 1, 2022)

Business description: Electricity retail business based on the Electricity Business Act and other energy-related businesses

Establishment: October 18, 2019

Website: (Japanese only)


Headquarters: 13F Shibuya Cross Tower, 2-15-1 Shibuya, Shibuya-ku, Tokyo

Representative: Yuko Mizuno, Representative

Number of employees: 21 (as at January 1, 2022, group total)

Business description: Formation, operation and investment of a fund mainly for investment into solar power plants in Japan

Establishment: August 2017

Website: (Japanese only)

*1 Rakuten Group, Inc. joined the international RE100 initiative in 2019 with the goal of transitioning to 100% renewable electricity used for all business operations by 2025. In FY2021, Rakuten Group, Inc.'s renewable electricity ratio reached 100%.  Going forward, Rakuten Group is aiming to transition all Group company operations to run on renewable electricity as per the RE100 initiative.

*2 As opposed to onsite PPAs, where the renewable power generation equipment is built on the customer’s premises, offsite PPAs enable the stable supply of energy to locations where it can be difficult to install power generation equipment, such as on base stations installed on utility poles.

*3 The Feed-in Tariff (FIT) system is a system where the government purchases renewable electricity at a fixed price for a fixed period. Part of the cost of purchase is collected as a levy to support the high cost of introducing renewable energy sources. While electricity generated through FIT does not release carbon dioxide, part of the cost of FIT is covered broadly by the entire demand side, so electricity from FIT is not considered 100% renewable energy. On the other hand, the cost of non-FIT electricity is covered only by the customers on the demand side that use the electricity, so it is considered to be 100% renewable energy.

*4 “REco” is a word combining the “RE” from “renewable” and “Rakuten Energy” with “ecology.” For more information, please visit the following site: (Japanese only)

*5 Includes non-fossil certificates.

*6 The estimate of greenhouse gas emissions uses substitute values determined in the report titled “About calculating and reporting of base emissions coefficient and emissions coefficient after adjustment for each electricity business operator” released on May 24, 2022.

*7 For more information about REts, please visit the following site: (Japanese only)

* The company names, product names, service names, etc. in this press release are registered trademarks or trademarks of each company.

*Please note that the information contained in press releases is current as of the date of release.

  • Month
  • Year
  • Category
  • Month
  • Year
  • Category