Taisei Corporation has set the achievement of virtually zero CO2 emissions from business activities as one of the 2050 Targets in its 2050 Environmental Targets, TAISEI Green Target 2050, aiming to reduce CO2 emissions and contribute to the realization of a decarbonized society.
Our two targets for 2030, which are the benchmarks of the TAISEI Green Target 2050, have been certified by the SBT initiative: one is the 62% (vs. fiscal 1990) CO2 emissions reduction target at the construction stage, and the other is the 55% (vs. fiscal 1990) CO2 emissions reduction target at the operation stage. To achieve the CO2 reduction target at the construction stage, we are promoting initiatives to reduce the environmental impact (TSA) in which all employees participate, as well as initiatives such as cooperating with specialized contractors (suppliers) and encouraging them to conduct conservation activities during construction and use heavy machinery and vehicles with high energy efficiency.
In addition, we have been working to use ZEB as a temporary worksite office that had not been considered as a target of energy conservation/ CO2 reduction initiatives due to its short usage period. In 2020 we obtained ZEB Ready certification for the first time in Japan for a temporary worksite office, and due to this initiative we were the Special Award from the Judging Committee in the Energy Conservation Grand Prize program of the Energy Conservation Center, Japan (ECCJ).
For achieving the CO2 reduction target at the building operation stage (for use by customers), we are promoting the provision of advanced energy conservation and ZEB technologies and accumulating construction results, while working with customers and other various stakeholders in the value chain. At the Taisei Group, we are implementing initiatives to reduce CO2 emissions at each phase of the value chain from the planning/design stage considering the lifecycle of the building, through the construction stage including new building construction, renewal and demolition, to the operation stage after completion and delivery to the customer, for the realization of a decarbonized society.
Risks and Opportunities
For the construction industry, rising temperatures in recent years, large-scale typhoons, and disasters caused by extremely concentrated heavy rain pose risk factors such as interruptions and delays in construction work. On the other hand, increased demand for net zero energy buildings (ZEBs), which is a measure to mitigate climate change, will lead to the creation of opportunities for orders. Taisei Corporation supports the Challenge Zero project of Keidanren (Japan Business Federation). In the field of renewable energy, it is working on ZEB and began technological development for floating offshore wind power generation facilities. In addition, we consider the green infrastructure promoted by the Ministry of Land, Infrastructure, Transport and Tourism as a means of mitigating and adapting to climate change as one of the opportunities to receive orders through our market expansion aimed at strengthening infrastructure, and we are promoting relevant technological development and design proposals.
2030 Targets Certified by the SBT initiative
By 2030, reduce the Scope 1 and Scope 2 greenhouse gas emissions by 26% from fiscal 2013 levels (62% reduction from fiscal 1990 levels), and the Scope 3 emissions by 25% from fiscal 2013 levels (55% reduction from fiscal1990 levels)
- Scope 1:Direct emissions associated with fuel use for heavy machinery and vehicles at construction worksites
- Scope 2:Indirect greenhouse gas emissions associated with electricity use at construction worksites
- Scope 3:Indirect emissions associated with energy use during the operational phase of the building delivered
Founded in 2015, this organization (initiative) requires companies to establish “Science-Based emission reduction targets Targets (SBT)” to contribute to the Paris Agreement, which has set the goal of limiting temperature increase to less than 2℃ above the pre-industrial level.
Taisei Corporation operates an Environmental Management System (EMS) based on ISO14001 on a company-wide basis. We have established an Environmental Committee, chaired by the President, which deliberates and decides on environmental policy and environmental targets that are important for environmental management, in addition to medium- and long-term targets and environment-related initiatives that lead to external evaluations.
TAISEI Sustainable Action (TSA)
An Initiative to Reduce Environmental Impact
To achieve its Environmental Policy and Environmental Targets, Taisei Corporation is implementing TAISEI Sustainable Action (TSA), an environmental impact reduction initiative in which all employees participate. In proceeding with this initiative, it is particularly important for many parties involved in construction, which has high CO2 emissions, to be aware of the importance of reducing environmental impact. Therefore, in addition to the “CO2 Zero Action,” which is our basic initiative that has been conducted at all worksites so far, effective specific technologies and activities are summarized in the “Action List,” and the materials, products and technologies used are explained in an easy-to-understand manner with photographs. In addition, the Company has established an award system for activities aimed at achieving the Environmental Targets.
Through this system we evaluate activities to reduce environmental impact, which serves as a model for other divisions, and we work to raise employees' environmental awareness.
Acquired ZEB Ready Certification for the New Itami City Hall and Its Temporary Worksite Office, the First of Its Kind in Japan
The construction of the new city hall building has been planned aiming for an environmentally friendly city hall under the concept of “a city hall that is full of dreams and attractiveness and supports a safe and secure life of residents.”
Kengo Kuma & Associates, the architect office that was in charge of the basic design, set a design concept of “achieving ZEB Ready certification as a large-scale city hall building over 20,000 m2 while overcoming various challenges that the reconstruction project faces, such as reconstructing the city hall utilizing the existing building, conceiving a design in consideration of regional development and scenery, BCP, and seismic isolation.” Taisei Corporation received the order for this project in a design-build (DB) method, taking charge of execution design through construction.
In addition to its being planned as a highly heat-insulated and well-sealed building capable of natural lighting and ventilation, the city hall also generates power as it equipped with a photovoltaic facility with a storage battery for disasters, achieving a 54% reduction in energy consumption in total. Thanks to the above measures, this project was adopted as one of the “resilience-enhancement type ZEB demonstration projects” of the Ministry of the Environment.
Meanwhile, in line with the environmentally friendly concept of the new city hall, we also worked on reducing CO2 emissions during construction. The temporary worksite office in construction work adopted versatile energy-saving technologies, such as a high-efficiency air conditioning system, LED lighting, and heat pump water heater. These technologies, in addition to an improved heat insulation capacity, contributed to the 54% reduction in primary energy consumption compared to a standard building.
Due to these measures, for the first time in Japan, not only the permanent city hall building but also the temporary worksite office obtained ZEB Ready certification.
A building that meets 50% or more reduction in primary energy consumption from the standard primary energy.
The new city hall obtained ZEB Ready certification under BELS
Promoting Green Infrastructure* as a Measure for Adapting to Climate Change
In the Shinagawa Season Terrace, building that makes effective use of the upper part of the Water Reclamation Center, we built a reservoir for rainwater in the basement of the Center, in order to temporarily store water during the early stages of heavy rain, to prevent polluted water from flowing directly into the sea. The building demonstrates other multifaceted functions of green infrastructure, including the creation of a wide open green space situated on artificial ground constructed above the ground, reduction of the heat island effect on the city by using this greenery to cool wind from the Tokyo Bay before sending it into the city area, and conservation of biodiversity by fostering new ecosystems through waterfront creation using rainwater.
Efforts to promote the creation of sustainable and attractive national land, cities, and regions by utilizing the diverse functions of the natural environment in terms of both hardware and software, such as social infrastructure development and land use. As countermeasures against climate change, there are measures to improve ground surface coverage by optimizing national land management, conserving green areas and promoting greening, measures to absorb CO2 by utilizing green areas and seagrass beds, measures to store and infiltrate rainwater by utilizing soil and permeable pavement, and heat mitigation measures that utilize the transpiration effects of planting.
Renewable Energy Projects
Taisei will promote initiatives relating to both land-based wind power generation and offshore wind power generation projects in general ocean areas, both of which are expected to be introduced and expanded in the future.
Wind power generation projects
Proposed offshore wind power generation project in northern Niigata Prefecture
Taisei is currently conducting a feasibility study for an offshore wind power generation installation to be constructed off the coast of northern Niigata Prefecture. A Document on Primary Environmental Impact Considerations was sent to the Minister of Economy, Trade and Industry on June 3, 2019, in accordance with the Environmental Impact Assessment Act and the Electricity Business Act, and the Minister's opinion was received on August 26 of that year.
Promotion of technical development accompanying the project
<Technologies for simulating windmill backwash and turbulence>
In developing wind power stations, it is important to be able to accurately predict the amount of power that will be generated. Depending on the placement of windmills, the backwash from windmills on the upwind side may attenuate and reduce the power generated by windmills located downwind. This may also cause an unbalanced wind load that causes windmill failure. Taisei is pursuing the development of technologies to simulate these phenomena.
<Development of concrete foundations for floating offshore wind generation facilitie>
On October 10, 2019, Taisei Corporation and the French company Ideol signed a Memorandum of Understanding for the joint development and promotion of floating foundations for floating offshore wind generation facilities for the Japanese market, using Ideol's patented Damping Pool® technology.
Geothermal power generation projects
Japan ranks third in the world in terms of number of volcanos, and it has tremendous potential for geothermal energy development. Taisei Corporation is involved in the development and administration of the following geothermal power generation projects as a purely domestic energy source developed using Japanese resources.
Biomass power generation projects
The fuels used for biomass power generation are environmentally friendly carbon-free resources that include wood, sewage sludge, domestic livestock feces and urine and food residue. Taisei is involved in the following biomass power generation projects that incorporate combustion methods and various types of fuels.
Energy supply projects (ESP)
Taisei Corporation has conducted mixed-use development projects and established Energy Centers at production facilities, and is participating in projects to supply electricity and heat. Heat source and other energy supply equipment is centralized to optimize the overall energy supply and achieve advantages for building owners, including in terms of Business Continuity Planning (BCP)*1 and Data Continuity Planning (DCP)*2.
- *1BCP:Business Continuity Plan
- *2DCP:District Continuity Plan
Energy Management (EM) Projects
Taisei analyzes and evaluates policies for the operation of building heat source equipment and the use of building energy, etc., and provides advice to ensure that energy use is always rational.
Energy Support Projects
Taisei provides support for building energy management to ensure that energy-saving performance is being achieved during the operation of Zero Energy Buildings and other buildings. The degree of achievement of energy conservation is reported in energy reports.
Use of hydrogen
Hydrogen is being called a purely domestically produced energy source that can be stored on a long-term basis. It is seen as a next-generation energy resource that can be used for power generation using fuel cells and as thermal energy.
- Metal hydride (MH) can be used to absorb hydrogen at low pressure in order to transport the hydrogen safely. Taisei is participating in a project to verify hydrogen supply chains that utilize this technology.
Participation in proving test of low-pressure hydrogen delivery system
Taisei is participating as one of the leading companies in the Environment Ministry's low-carbon hydrogen technology verification project conducted with regional cooperation (FY 2018) in Muroran City, Hokkaido.
Aiming to realize a carbon-neutral society by recycling CO2 as a resource
Taisei Corporation has developed “T-eConcrete®/Carbon-Recycle,” a carbon-recycle concrete that can make the balance of CO2 emissions negative. We utilize calcium carbonate produced by having CO2 recovered from factory exhaust gas, etc. react with calcium components. We fix CO2 inside concrete by solidifying calcium carbonate with a binder mainly composed of blast furnace slag, which is an industrial by-product. By doing so, we have been able to improve issues such as the corrosion of reinforcing rods in concrete and decrease in strength, which had been problems that arose when CO2 was directly taken into concrete. As a result, it has become possible to take in a large amount of CO2 and make the CO2 balance of concrete negative.
Taisei Corporation has developed a number of environmentally friendly concrete technologies, including the environmentally friendly concrete, “T-eConcrete®/Zero-Cement type,” which received the 2014 Environmental Award (Group-I) from the Japan Society of Civil Engineers, and the Engineering Commendation Award of ENAA 2021 from the Engineering Advancement Association of Japan. Our existing technologies culminated in this technology.
CO2 Emissions by Business (Non-Consolidated)
Prediction of CO2 emissions in the building operation stage and reduction percentage (Non-consolidated)