Renewable Energy
Energy Business
MIRARTH HOLDINGS Group promotes Energy Business utilizing renewable energy that contributes to reducing greenhouse gas (CO₂) emissions. Since entering the Energy Business in 2013, we have been developing mega solar power plants and small- to medium-sized solar power plants on idle land nationwide. In addition, we are working on renewable Energy Business other than solar power, such as wind and biomass, and as of the end of March 2026, the cumulative operational power generation capacity 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 power plant will be the second largest solar power plant developed by our group to date, following the "LS Chiba Katsuura Power Plant" (generation capacity approximately 30 MW).
| Geographic 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 Tokyo Electric Power Company Energy Partner.
In September 2025, MIRARTH Energy Solutions began supplying electricity based on an off-site corporate PPA * between Tokyo Electric Power Energy Partner Co., Ltd. and Shinjuku Center Building Management Co., Ltd., a group company of Tokyo Tatemono Co., Ltd.
Under this contract, TEPCO Energy Partner will procure renewable energy generated from a newly developed solar power plant (total installed capacity approximately 1.5MW) in the Kanto area by MIRARTH Energy Solutions and supply it to the Shinjuku Center Building.
By purchasing electricity generated by the target facilities by the Shinjuku Center Building Management as a customer, it is expected to contribute to the expansion of new renewable energy sources.
- * 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.
Electricity purchase and sale contract with Toho Gas
MIRARTH Energy Solutions has signed a power purchase agreement with Toho Gas Co., Ltd., aiming to promote and expand renewable energy in the Chubu region.
Under this agreement, MIRARTH Energy Solutions will procure 100% renewable energy electricity generated by a solar power plant (total installed capacity approximately 1.6MW) in the Chubu area, along with its environmental value, to supply to customers.
Specified Wholesale Supply to UPDATER
Green Energy LLC, for which MIRARTH Asset Management is entrusted with asset management, has entered into a specified wholesale supply contract with UPDATER, Inc. at the LS Chiba Sanbu East & West Power Plant. Electricity generated at the LS Chiba Yamabu East and West Power Plants is supplied via UPDATER to households that select energy with low environmental impact and to companies practicing environmentally conscious management.
Hokuriku Electric Power Company and specific agreement for off-site corporate PPA
MIRARTH Energy Solutions has signed a specific contract with Hokuriku Electric Power Co., Ltd. for an offsite corporate PPA. This agreement is based on the "Basic Agreement" signed between the two companies in September 2023 to promote off-site corporate PPAs.
Under this agreement, Hokuriku Electric Power will procure renewable energy generated at a solar power plant (total installed capacity of approximately 1.3MW) planned by MIRARTH Energy Solutions in Shikoku and supply it to customers. By allowing consumers to purchase electricity generated by the target power generation facilities, it is 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.
- ※ オンサイトPPA：需要地の敷地内にて発電された再エネ電力を供給する契約方式。
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 Tokyo Electric Power Company Energy Partner
MIRARTH Energy Solutions has signed an agreement with Tokyo Electric Power Energy Partner Co., Ltd. regarding the solar power generation business to promote off-site corporate PPAs.
Under this agreement, renewable energy generated at MIRARTH Energy Solutions-owned power plants will be systematically supplied to consumers through the retail electricity operator, TEPCO Energy Partners, in order to meet the customer needs of TEPCO Energy Partners. We will provide non-fossil value to many demand destinations, mainly companies participating in RE100.
Wind Power Generation
MIRARTH Wind Power Aomori Nakadomari Power Plant
MIRARTH Windpower Aomori Nakadomari Power Plant consists of two wind turbines with an output of 3.6MW and began operation in November 2023. The annual power generation is expected to be 16,911 MWh.
MIRARTH Energy Solutions acquired it 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 future possibilities expanding by utilizing storage batteries.
The operation 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.
| Geographic location; | Aomori Prefecture, Kitatsugaru District, Nakadomari Town, Oaza Tamogi, Wakamiya area, etc. |
| 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 a large rotor blade about 41 meters in length, 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 power plant is the first onshore wind power plant in Otobe Town, and also the second wind power plant for our group.
| Geographic 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
MSB Kanagawa Aikawa Energy Storage Plant
MIRARTH Asset Management began commercial operation of the "MSB (MIRARTH Storage Battery) Kanagawa Aikawa Storage Station," jointly developed with PowerX Co., Ltd. in Aikawa Town, Aikō District, Kanagawa Prefecture, on September 1, 2025.
The adjustment capabilities of this storage station, the first one owned by our group, will be utilized for supply-demand balancing in the PowerX retail electricity business, including the corporate renewable energy service "X-PPA," as well as operate wholesale electricity 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-use storage stations.
In recent years, as the introduction of renewable energy has expanded, the importance of 'grid-based storage stations' to stabilize the power grid from the perspective of mitigating output fluctuations has been increasing. PowerX possesses state-of-the-art battery technology and operational systems, and by combining its technological expertise with the development capabilities cultivated through renewable Energy Business by MIRARTH Energy Solutions, it contributes to stabilizing power supply and demand. At the same time, we aim to accelerate the construction of grid-based storage plants, 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 Battery LLC in a joint venture with Tokyo Century Co., Ltd., and to start a special high-voltage system battery business* in Yokohama City, Kanagawa Prefecture. This project was selected for the FY2024 "Support Project for the Introduction of Large-Scale Storage Batteries for Grids with an Eye to Expansion of Renewable Energy Introduction," solicited by the Tokyo Metropolitan Environment Public Interest Incorporated Foundation.
In recent years, the importance of grid-use 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 enter 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) |