Renewable Energy
Energy Business
MIRARTH HOLDINGS Group promotes Energy Business that utilizes renewable energy to contribute to reducing greenhouse gas (CO₂) emissions. Since the launch of the Energy Business in 2013, we have been developing mega solar power plants and small- to medium-scale solar power plants on idle land nationwide. In addition, we are working on other renewable energy projects than solar power, such as wind and biomass, and as of the end of March 2026, the cumulative power capacity in operation has reached 393 MW.
Solar Power Generation
LEBEN Solar Kagoshima Osaki 1 and 2 Solar Power Plants
The LS (LEBEN Solar) Kagoshima Osaki No.1 and No.2 Solar Power Plants will secure approximately 22MW divided into four sites, generating an estimated annual power generation of about 26.6 million kWh, which is equivalent to the annual electricity consumption of about 7,800 households. All generated electricity is sold to general transmission and distribution operators using FIT system.
Additionally, as a flood control measure, seven disaster prevention control ponds have been installed, making it a large-scale power plant designed with consideration for the surrounding environment.
This is the second largest solar power plants developed by MIRARTH HOLDINGS Group to date, following LS Chiba Katsuura Power Plant, which has a capacity of approximately 30 MW.
| Location | 3970-1 Aza Namikidan, Nogata, Osaki-cho, So-gun, Kagoshima Prefecture, Japan, and others |
| Area | Approximately 370,000 ㎡ |
| Generation Capacity | 22,366.8 kW |
| Estimated Annual Generation | Approximately 26.6 million kWh |
| Feed-in Tariff | 18 yen/kWh |
Promotion of Renewable Energy Supply and PPAs
Power supply based on an off-site corporate PPA with TEPCO Energy Partner
In September 2025, MIRARTH Energy Solutions began supplying electricity based on an off-site corporate PPA* between TEPCO Energy Partner, Inc. and Shinjuku Center Building Management Co., Ltd., a group company of Tokyo Tatemono Co., Ltd.
Under this agreement, TEPCO Energy Partner procures renewable energy generated from new solar power plants developed by MIRARTH Energy Solutions (total installed capacity approximately 1.5 MW) in the Kanto area and supply it to the Shinjuku Center Building.
By purchasing electricity generated at the off-site facilities, Shinjuku Center Building Management can expect additionality that contributes to the expansion of new renewable energy sources as a power consumer.
- * Off-site Corporate PPA: A contract method in which renewable energy generated at a remote location, not the point of demand, is supplied to consumers such as companies through the power grid and retail electricity providers.
Power Purchase Agreement Signed with Toho Gas
MIRARTH Energy Solutions has signed a power purchase agreement with Toho Gas to promote and expand renewable energy in the Chubu region.
Under this agreement, MIRARTH Energy Solutions will procure 100% renewable electricity and its associated environmental value. The electricity will be generated by solar power plants that MIRARTH Energy Solutions will develop and operate in the Chubu region. These plants will have a total installed capacity of approximately 1.6 MW.
Specified Wholesale Supply to UPDATER
Green Energy LLC, whose assets are managed by MIRARTH Asset Management, has entered into a specified wholesale supply agreement with UPDATER, Inc. for LS Chiba Sammu East and West Power Plants. Electricity generated at these plants is supplied via UPDATER to households that choose energy with low environmental impact and to companies pursuing environmentally responsible business practices.
Specific Agreement Signed with Hokuriku Electric Power Company for Off-Site Corporate PPA
MIRARTH Energy Solutions has concluded a specific agreement with Hokuriku Electric Power Company for an off-site corporate PPA*. This agreement was executed pursuant to the Basic Agreement concluded between the two companies in September 2023 to promote off-site corporate PPAs.
Under this agreement, Hokuriku Electric Power Company will procure and supply renewable electricity generated by solar power plants that MIRARTH Energy Solutions plans to develop in the Shikoku region. These plants will have a total installed capacity of approximately 1.3 MW. By purchasing electricity from these facilities, consumers are expected to contribute to the expansion of new renewable energy sources.
On-site PPA Power Supply Agreement Concluded with Yamanashi Prefecture
MIRARTH Energy Solutions has entered into a power supply agreement with Yamanashi Prefecture for an on-site PPA *. Under the agreement, MIRARTH Energy Solutions will supply Yamanashi Prefecture with renewable electricity generated by solar power facilities that MIRARTH Energy Solutions will develop at five public sites in the prefecture, with a total installed capacity of approximately 337 kW. By purchasing the power generated from these facilities, the prefecture is expected to promote additionality by driving the growth of new renewable energy sources.
- * On-site PPA: A contract method for supplying renewable energy generated on the premises of the demand site.
On-site PPA Power Supply Agreement Signed with Sapporo City
MIRARTH Energy Solutions has signed a power supply agreement with Sapporo City, Hokkaido for an on-site PPA. Under this agreement, renewable electricity generated by a solar power system installed at the Hippopotamus and Lion Exhibit in Maruyama Zoo, managed by the Sapporo City Environmental Bureau, will be supplied directly to the facility. The system has a capacity of 49.5 kW and a total output of 70.55 kW. By purchasing the electricity generated from this system, the city is expected to support the expansion of new renewable energy sources.
Basic Agreement with TEPCO Energy Partner
MIRARTH Energy Solutions has signed an agreement with TEPCO Energy Partner, Inc. for a solar power generation project, to promote off-site corporate PPAs.
Under this agreement, renewable energy generated at MIRARTH Energy Solutions' power plants will be systematically supplied to consumers through TEPCO Energy Partner, which serves as a retail electricity provider, in order to meet needs of its customers. MIRARTH Energy Solutions will deliver non-fossil energy value to a broad range of users, primarily companies participating in RE100.
Wind Power Generation
MIRARTH Wind Power Aomori Nakadomari Power Plant
MIRARTH Wind Power Aomori Nakadomari Power Plant consists of two wind turbines with an output of 3.6 MW each, and began operation in November 2023. The annual power generation is expected to be 16,911 MWh.
MIRARTH Energy Solutions acquired the power plant in April 2025, and on April 24, a roundtable meeting was held at Nakadomari Town Hall to exchange opinions on initiatives toward realizing a decarbonized society. At the roundtable, opinions were exchanged from various perspectives, including technologies to create new renewable energy sources such as wind and solar power, and the potential of storage batteries.
The management of this power plant is undertaken by MIRARTH Asset Management, which aims to pursue the potential of renewable energy and real estate through financial product development through various schemes within our Group.
| Location | Wakamiya area, etc., Tamogi, Nakadomari Town, Kitatsugaru-gun, Aomori Prefecture |
| Generation Capacity | 7.2MW (3.6MW×2 units) |
| Estimated Annual Generation | Approximately 16,911MWh |
| Feed-in Tariff | 22 yen/kWh |
MIRARTH Wind Power Hokkaido Otobe Power Station
MIRARTH Wind Power Hokkaido Otobe Power Station consists of two wind turbines, each approximately 120 meters tall with an output of 2,300 kW. Each 78-meter tower supports three large 41-meter-long blades, offering a design optimized for both generation efficiency and operational stability. The plant's estimated annual output is around 10.058 million kWh, equivalent to the annual electricity consumption of approximately 2,400 average households. This contributes to a reduction of about 5,300 tons of CO₂ emissions.
This is the first onshore wind power plant in Otobe Town, and also the second wind power project in MIRARTH HOLDINGS Group.
| Location | 547-6, Aza Genna, Otobe-cho, Nishi-gun, Hokkaido, and 10 other land lots (lot number) |
| Generation Capacity | 4,600 kW |
| Estimated Annual Generation | Approximately 10.058 million kWh |
| Feed-in Tariff | 22 yen/kWh |
Biomass Power Generation
Fujisan Asagiri Biomass Plant
Fujisan Asagiri Biomass Plant is operated by Fujisan Asagiri Biomass LLC, jointly funded by MIRARTH HOLDINGS. Electricity generated at the plant is supplied to eastern Shizuoka Prefecture through a regional utility company.
This power plant utilizes biomass power generation using cow manure collected from members of the Fuji Development Agricultural Cooperative. By burning biogas produced from fermented cow manure, it is possible to reduce CO₂ emissions compared to methods that directly burn wood chips and combustible waste. Furthermore, the liquid fertilizer produced along with the biogas is sold to various parties as "Mt. Fuji Morning Mist Biomass Liquid Fertilizer," contributing to a reduction in the use of chemical fertilizers.
The power generation facilities also repurpose a site previously used in the Ministry of the Environment's "Model Project for Environmentally Harmonized Biomass Utilization." Reusing a structure originally slated for demolition also helps reduce carbon emissions that would have resulted from the demolition process.
Grid Storage Facilities
MSB Kanagawa Aikawa Energy Storage Plant
MIRARTH Asset Management began commercial operation of the "MSB (MIRARTH Storage Battery) Kanagawa Aikawa Energy Storage Station," jointly developed with PowerX Co., Ltd. in Aikawa Town, Aiko District, Kanagawa Prefecture, on September 1, 2025.
The adjustment capabilities of this storage station, the group's first storage facility, will be utilized for supply-demand balancing in the PowerX retail electricity business, including the corporate renewable energy service "X-PPA," as well as operating wholesale power trading markets, capacity markets, and supply-demand adjustment markets.
Going forward, we will continue to promote the development of grid-connected storage plants and contribute to stabilizing regional grids during the phase of expanding renewable energy.
Basic Agreement on Comprehensive Collaboration with PowerX
MIRARTH Energy Solutions has signed a basic agreement with PowerX Co., Ltd. regarding a comprehensive business partnership for the joint development and operation of grid-scale storage stations.
In recent years, as the introduction of renewable energy has expanded, the importance of grid-scale battery storage systems to stabilize the power grid from the perspective of mitigating output fluctuations has been increasing. PowerX Co., Ltd. possesses state-of-the-art battery storage technology and operational systems, and by combining its technical expertise with the development capabilities MIRARTH Energy Solutions cultivated through its renewable energy business, we contribute to stabilizing power supply and demand. At the same time, we aim to accelerate the construction of grid-scale battery storage systems, next-generation energy infrastructure aimed at realizing a carbon-neutral society, and to establish sustainable energy infrastructure.
Battery Business for Extra-High Voltage Power Grids
MIRARTH Energy Solutions has decided to establish MIRAI Tokyo Storage LLC through joint investment with Tokyo Century Corporation to start a storage battery* business for special high-voltage systems in Yokohama City, Kanagawa Prefecture. This project has been selected for the "Large-scale Storage Battery Introduction Support Project for Grids with an Expectation of Expanding the Introduction of Renewable Energy" publicly solicited by the Tokyo Metropolitan Environment Corporation in FY2024.
In recent years, the importance of grid-scale storage batteries for balancing electricity supply and demand has been increasing from the perspectives of promoting renewable energy and mitigating output fluctuations. Based on this, MIRARTH Energy Solutions has decided to take part in this project, which can contribute to stabilizing grid electricity and enhancing the value of local communities.
- * Extra-high voltage battery storage: This refers to a battery storage system (with a capacity of 2,000 kW or more) that is directly connected to the power grid (power plants, transmission lines, substations, etc.) and used to respond to supply and demand fluctuations of the entire power system, rather than fluctuations in the output of a specific power source.
| Business Overview | |
|---|---|
| Business operator | MIRAI Tokyo Energy Storage LLC |
| Planned site for battery storage installation | Asahi Ward, Yokohama City, Kanagawa Prefecture |
| Rated output | 12,000kW |
| Rated capacity | 65,808kWh |
| Battery method | Lithium-ion battery |
| Site area | Approximately 8,000㎡ |
| Start of operation | Fiscal Year 2029 (Planned) |