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Carbon Neutrality

Buildings are associated with significant CO2 emissions throughout their lifecycle. The manufacture of construction materials such as concrete and steel also generates substantial CO2, and the fuel and electricity used by heavy equipment at construction sites emit CO2, as well. Even after a building is delivered to the client, it continues to generate large amounts of CO2 emissions during its long period of use.

As a construction company, Kajima is directly responsible for reducing CO2 emitted during construction (Scope 1 and 2), where its reduction efforts can be most readily reflected. However, this accounts for only about 3% of total lifecycle emissions. For building owners, CO2 emitted during completed building operation are counted as their own emissions, and given the long duration of this period, achieving carbon neutrality during operation is a significant challenge.

Kajima has set emissions reduction targets for both its own emissions (Scopes 1 and 2) and its supply chain emissions (Scope 3) to be achieved by FY2026 and FY2030, with the goal of reaching carbon neutrality by FY2050. Additionally, by FY2026, the company will quantify and disclose avoided CO2 emissions, based on the provision of solutions for the reduction of emissions not included in Scopes 1, 2, and 3. These include emissions avoided by extending the lifespan of buildings and other structures, and by performing energy-saving renovations of buildings.

Overview of CO2 Emissions from the Kajima Group’s Supply Chain

Overview of CO2 Emissions from the Kajima Group’s Supply Chain

1. Main emissions are Category 1 (those arising from purchased goods and services)
2. Main emissions are Category 11 (expected lifetime emissions from relevant products)
Note: For construction work outside Japan, CO2 emitted by subcontractors during construction is included in Scope 3.

Initiatives to Reduce Scope 1 and 2 (Kajima) Emissions

KPIs and Targets

To achieve carbon neutrality by 2050, Kajima will work on energy efficiency, electricity decarbonization, and fuel decarbonization. Initially, priority will be given to the relatively more straightforward tasks of improving energy efficiency and decarbonizing electricity, with the decarbonization of fuels advancing gradually. If it is difficult to fully decarbonize fuels by 2050, offsets will be used to achieve carbon neutrality.

KPIs and Targets

Roadmap for Reduction of Scope 1 and 2 (Kajima) Emissions

Roadmap for Reduction of Scope 1 and 2 (Kajima) Emissions

Decarbonization of Electricity and Fuel

100% green electricity use by FY2030

Purchasing renewable electricity from power companies
Using renewable energy certificates for purchased electricity

  • ⇒ For the future, using our own renewable energy certificates, and making direct use of renewable electricity generated by Kajima's own equipment

Investing in renewable electricity sources to cover internal power consumption in Japan

Continuing to invest with the aim of securing renewable electricity generation capacity that exceeds power requirements in Japan by FY2030


Wind turbines of Oga Wind Power Co., Ltd., in which Kajima has a financial stake

1. Includes fuel use efficiencies such as productivity improvement and energy saving in factories

Biofuel adoption rate of 65% by FY20302

Fuel to generate power

Using light fuel oil mixed with biofuel

  • ⇒ Gradually increasing the biofuel rate
  • ⇒ Plan to use synthetic fuel and hydrogen in the future

Adoption of an internal carbon pricing system

Fuel to generate heat

Plan to switch from Type A heavy oil to LNG with its low emission coefficient, and to utilize biofuel co-combustion

  • ⇒ Hydrogen fuel adoption in the future

2. Non-consolidated Kajima target


Kajima Group company Toshi Kankyo Engineering produces biofuel from waste cooking oil for use at Group construction sites, etc.

Initiatives to Reduce Scope 3 (Supply Chain) Emissions

While collaboration with other companies is essential for reducing Scope 3 (supply chain) emissions, Kajima will focus first on areas where it can make efforts on its own. Among Scope 3 categories, the company will work mainly on developing and using low-carbon building materials (i.e., concrete and concrete/steel, respectively) to address Category 1 (CO2 from building material manufacturing) and on expanding Zero Energy Buildings (ZEBs) to address Category 11 (CO2 from building operation).

Supply Chain CO2Emissions

Supply Chain CO2 Emissions

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