Asunaro Aoki Construction Co., Ltd.：Contributing to Disaster Prevention, Mitigation, and Ecological Restoration with Amphibious Bulldozers.
Aoki Asunaro Construction is the only construction company in Japan that owns amphibious bulldozers (Swivel?), and it possesses all five operational Swivel? bulldozers that Komatsu began mass-producing in 1971. Amphibious bulldozers have accumulated a track record of over 1,200 construction projects in shallow waters up to 7 meters deep, contributing to disaster prevention, mitigation, disaster recovery, and coastal natural restoration (NETIS registration number: QS-220011-VE). In recent years, in order to address social issues such as natural disasters that have become more severe and frequent due to global warming, as well as the declining birthrate, aging population, and shortage of skilled workers, we have been working with Komatsu to develop an electric underwater construction robot, and are currently conducting field trials. This machine is equipped with the latest ICT functions and automatic control, making it safe and easy for anyone to operate, even without specialized skills, and enabling significant improvements in work efficiency and speed. In the future, underwater construction will promote renewable energy and the creation of seaweed beds and tidal flats (creation of blue carbon ecosystems).
Toko Geotech Co., Ltd. : From Non?Native to Native Species -- Setting a New Standard for Green Infrastructure in Slope Greening
Office Park Omura
(27 years and 10 months after construction)
In recent years, the increasing frequency of localized heavy rainfall has become a social issue, raising the risk of slope failures and landslides in mountainous areas and along roadsides. As these risks grow across many regions, the importance of proper slope management has continued to increase.
Toko Geotech engages in slope stabilization projects as well as ground improvement and foundation works. One of its key strengths lies in its ability to carry out slope greening with consideration for local ecosystems through an integrated process, from seed quality control to on-site implementation.
While greening slopes is desirable from a landscape perspective, conventional methods using non-native species, despite their advantages, have drawn criticism for issues such as creating feeding grounds for wild deer and generating allergenic pollen. In response, the company has taken on an industry-first challenge by establishing its own seed storage facilities and quality control systems to promote the use of native plant species.
This initiative represents a practical model of green infrastructure--simultaneously advancing disaster prevention and ecosystem restoration, starting from the quality of native seeds.
Kongo Gumi Co., Ltd.: Revitalizing forests through master carpentry skills.
Japan is a country where approximately 70% of its land area is covered by forests, and about 40% of those forests are man-made.
Man-made forests require "circulating forest management," in which harvesting and replanting are carried out at appropriate times. However, due to factors such as profitability, many forests that are ready for harvesting remain unmanaged and left standing.
At the same time, in the construction and restoration of temples and shrines--where large-diameter timber is required--it has become increasingly difficult to procure such timber because of the limited availability of sawmills capable of processing large logs and the associated costs.
Believing that traditional Miyadaiku carpentry techniques can help address these challenges, Kongo Gumi developed the Bundled Column method. A Bundled Column is a construction technique in which small-diameter timber is bundled together to form a large column. Through this approach, Kongo Gumi aims to achieve both the cyclical use of man-made forests through master carpentry skills and the stable procurement of timber essential for traditional architecture.
Participating in the SDGs Award as a Partner Company
Takamatsu Group participates as a partner company in the SDGs Award organized by Newsweek Japan. Partner companies are businesses that collaborate with Newsweek Japan to promote SDG initiatives in the Japanese business community both domestically and internationally, and to tackle various challenges as a team. By gaining a deeper understanding of each other's initiatives, partner companies can draw inspiration for their own efforts, collaborate across industry boundaries, and work together to create a sustainable society and environment.
We recognizes "Addressing climate change risks" as one of its material issues. To address this issue, in line with the Corporate Philosophy of
"We conduct the construction business as a mutually complimentary activity vital to society," we have formulated a CO2 Emissions Reduction Roadmap that sets a course toward achieving carbon neutrality by 2050.
Governance System
Takamatsu Construction Group has established the Climate Change Response Promotion Committee, which is chaired by President and Representative Director of the Board, as an organization for the formulation of decarbonization measures and the study and deliberation on the risks and opportunities associated with climate change. This committee is responsible for planning specific decarbonization strategies and leads efforts to meet our reduction targets and address social challenges. Through close collaboration with our Group companies'business divisions, we are driving decarbonization-focused management to achieve carbon neutrality.
Takamatsu Group's GHG Emissions and Reduction Targets
The Group's GHG emissions and reduction targets, calculated in accordance with the GHG Protocol*1, are presented below.
Target ①
Using FY2023 as the base year, reduce total Scope 1 and 2 emissions by at least 24% by 2030 and reach carbon neutrality by 2050
Target ②
Using FY2023 as the base year, achieve carbon neutrality in Scope 3 emissions by 2050
Scope 1 Actual Values (FY2023)
7,735 t-CO2eq
Scope 2 actual values (FY2023)
- Location criteria:11,992 t-CO2eq
- Market standards:12,339 t-CO2eq
Scope 3 actual values (FY2023)
556,954 t-CO2eq (*2)
Our Group companies, Asunaro Aoki Construction and Mirai Construction, have established emissions reduction targets consistent with the
Science Based Targets initiative (SBTi)*3, which have been validated by the initiative.
*1 Global standardized frameworks to measure and manage greenhouse gas (GHG) emissions, including those from private and public sector operations, value chains, and mitigation actions.
*2 Currently our Scope 3 emissions calculation covers Asunaro Aoki Construction and Mirai Construction within the Group, as well as Aoki Marine and M's, Mirai Construction's group companies. Going forward, Takamatsu Construction Group and other core companies (Takamatsu Corporation, Toko Geotech, and Takamatsu House) will be added to emissions calculations, followed sequentially by other Group companies.
*3 An international initiative that promotes the setting of science-based GHG emissions reduction targets aligned with the 2015 Paris Agreement, aiming to achieve net-zero emissions by 2050 and limit global temperature rise to 1.5°C above pre-industrial levels to respond to climate change.
Transition Strategy to Achieve Carbon Neutrality
Recognizing the significant impacts of the transition to a decarbonized society, we align our reduction measures with the GHG Protocol
and develop scenario-based strategies to mitigate them. We are also formulating a roadmap that takes into account medium- to longterm scenarios.
1. Reduce CO2 emissions at construction sites (Scope 1)
We advance CO2 emissions reduction by improving productivity through streamlined construction processes and use of advanced construction
equipment, while implementing energy-saving measures.
2.Promote renewable energy adoption (Scope 2)
We promote the adoption of power from renewable sources for company-owned buildings and site offices. In addition, we implement energysaving
activities at each office to reduce CO2 emissions across the Group.
3. Procure low-carbon and environmentally friendly construction materials (Scope 3)
Asunaro Aoki Construction, a Group company, has participated in the study group for CELBIC, an environmentally friendly BF concrete, to
promote the development and widespread adoption of low-carbon concrete.
The company is also involved in a research and development project on Carbon Pool Concrete, a material that fixes CO2 during production, with the goal of integrating it into building structures.
Furthermore, we are participating in a research and development project for "carbon pool concrete," which sequesters CO2 during the manufacturing process, and are working towards its implementation in structures.
4. Provision of energy-efficient buildings (Scope 3)
To address the substantial energy consumption of buildings during operation, the Group promotes energy-efficient solutions, including Zero Energy Buildings (ZEBs) and Zero Energy Houses (ZEHs), which reduce annual energy consumption while maintaining optimal indoor comfort.
We highlight the benefits of ZEBs and ZEHs and proactively propose these options to customers considering new construction or renovation, promoting the widespread adoption of energy-efficient buildings.
Advancing Environmentally Conscious Businesses
Promoting ZEB and ZEH adoption
Takamatsu House, a Group company, is strengthening its offering of highly insulated homes that meet ZEH (Net Zero Energy House)
standards--Grade 5 for insulation performance and Grade 6 for primary energy efficiency--and has been certified as an HTT Initiative
Promotion Company by the Tokyo Metropolitan Government.
The company is also proactively promoting the widespread adoption of ZEHs, aiming to apply ZEH standards to all newly planned readybuilt
housing from FY2024 onward.
Renewable energy business
Battery Energy Storage Projects
Renewable Energy: Battery Energy Storage Project--Asunaro Aoki Construction
(Concept image of Sapporo Battery Energy Storage Facility)
Following a legal revision in December 2022, battery energy storage systems are now permitted to discharge electricity directly into the
grid via transmission lines. This development is accelerating the growth of battery storage businesses that help stabilize grid power from renewable energy sources, whose output fluctuates with weather conditions, thereby advancing the transition to a decarbonized society. In collaboration with power companies and other partners, Asunaro Aoki Construction is developing an energy storage business model, including grid-scale battery energy storage facilities (output 10 MW, capacity 30 MWh) now under construction in Ishikari City and Sapporo City, Hokkaido. We will continue to grow our business to advance the shift toward carbon neutrality.
Wind Power Generation Projects
Renewable Energy: Wind Power Generation Project--Asunaro Aoki Construction
(Higashiyurihara Wind Farm)
As of 2024, wind farms installed in Japan have reached a cumulative capacity of 5,840 MW across 2,720 units. Asunaro Aoki Construction
has been engaged in wind farm construction since 2004. As of May 31, 2025, its nationwide portfolio includes 264 completed facilities
with a total capacity of 571 MW. The company has implemented various improvement measures and made proposals in each phase of its operations starting from onsite inspections to planning, research design, development approvals, and construction, successfully completing projects even in mountainous areas with complex terrain and other locations traditionally considered difficult to develop.
Solar Power Generation Projects
Renewable Energy: Solar Power Generation Project--Asunaro Aoki Construction
(Kumenan Mega Solar)
The introduction of the Feed-in Tariff (FIT) system for renewable energy in 2012 spurred a rapid nationwide increase in solar power
plant construction. Amid this expansion, Asunaro Aoki Construction has been involved in the entire solar project cycle since the early days
of development--from planning, onsite inspections, project proposals, and technical support for approvals and design, through to construction. As of May 31, 2025, the company has completed 38 sites with a total capacity of 889 MW and has additionally established a proven track record of executing construction projects on complex terrains, including the redevelopment of former golf courses.
Greening with Bio-Diversity in Mind
Toko Geotech Corporation Co., Ltd.：Greening with Bio-Diversity in Mind
Since 1995, Toko Geotech has been conducting environmental greening projects on slopes, collecting and storing native seeds in-house and utilizing them in slope greening projects, with the aim of realizing "natural restoration greening using native species that takes biodiversity into account." In the greening of slopes and inclines in the coming era, there is a growing demand for natural restoration greening using native species, rather than non-native ones.
[Revegetation Method by Toko Geotech Corporation Co.,Ltd.]
Eco-Stripe Revegetation Method (Non-planar Seeding Method)
Eco-Stripe Revegetation Method
This method is a combination of planned seeding and natural plant invitation works. By artificially creating green band area to invite natural seeds from the surrounding area to the construction area, surrounding green environment will promote nature restoration of the construction site with limited cost.
Reme-Forest Revegetation Method (Natural Plant Invitation Method)
Reme-Forest Revegetation Method
This method is a natural plant invitation promotion method by catching natural flying seeds. By putting "Seed Catcher (3D seed catching promotion net)" on top of sprayed "high tolerance basis", natural ground and Seed Catcher can be firmly adhered. This enables combination of slope protection and quick nature restoratioon of rocky slope with bumpy surface.
Recycle Earth Green Revegetation Method (Resource Circulation Revegetation Method)
Recycle Earth Green Revegetation Method
This method is a resource circulation revegetation method by mainly utilizing waste soil generated by dug-out soils and landslide soils. By re-utilizing waste soils of the construction site, usage of new revegetation resource as well as its transportation cost can be reduced, at the same time resulting in reduction of CO2. This method can be applied to wide range of revegetation methods from rapid revegetation method to rapid reforestation method using domestic species.
[Research and Development Facility]
Japan Tree Seed Laboratory
Through collection of domestic seeds and proprietary technology of "early germination inspection method", this laboratory conducts seed quality inspection, issue quality certifications and seed storage technology development.
Japan Tree Seed Laboratory
Quality examination by using early germination inspection method
Seed Storage, Scaling and Packaging Center (RS Center)
This center stores domestic seeds for mid to long-term by using our proprietary technology, as well as packaging, measurement and shipping of various seeds.
Seed Storage Center
Seed weighing/bagging equipment
Takamatsu Construction Group endorsed the recommendations of the Task Force on Climaterelated
Financial Disclosures (TCFD) in June 2023, and has since disclosed information in line with the recommendations. We will continue to promote sustainability-based management and expand financial disclosures in accordance with the TCFD recommendations.
2. Strategy
- Identifying climate change as one of the medium- to long-term risks, for the purpose of considering strategies based on related risks and
opportunities and organizational resilience, we conducted a scenario analysis mainly of our architecture (including detached housing) and
civil engineering businesses, to study the impact on Takamatsu Construction Group over the long term until 2050. In this exercise, we
referred to the climate change scenarios (under 2°C scenario*? and 4°C scenario*?) presented by the International Energy Agency (IEA) and
the Intergovernmental Panel on Climate Change (IPCC).
* Under 2°C scenario: Scenarios in which measures are taken to minimize temperature rises, including tightening of restrictions and changes to markets (IEA-WEO2022-APS; IPCC Fifth Assessment Report (AR5), RCP2.6, etc.)
*4°C scenario: Scenarios in which temperature rises result in physical impacts, e.g. extreme weather events (IPCC Fifth Assessment Report (AR5), RCP8.5, etc.)
