HomeSustainabilityThe EnvironmentExternal economic benefit (EEB)

External economic benefit (EEB)

We evaluate the socioeconomic benefits from environmental impact reduction due to increased recycling of waste in monetary terms.

Basic approach

 We use the external economic benefit (EEB) evaluation method with our Recycled-Waste-to-Cement System to express, in monetary terms, our evaluation of the socioeconomic benefits from environmental impact reduction due to increased recycling of waste accepted from outside the company. We calculate that we created a social benefit of 87.2 billion yen in FY2023. The reduction in the amount of natural resources, waste and by-products in FY2023 decreased from the previous fiscal year, leading to an approximate 4% reduction in economic benefit on the previous fiscal year.

  • We have developed a unique evaluation method to estimate the overall environmental benefit to society by utilizing waste materials from other industries.
  • We use information, including data collected for the GCCA Cement CO2 Protocol, to calculate the reduction in consumption of fossil energy and natural resources associated with the use of waste and by-products.
  • Economic benefits are calculated by multiplying reductions in consumption (effects of environmental conservation) by set market prices. The market values of the inventory items are set at FY2001 levels, and are estimated on the basis of the following considerations.
    CO2: 3,000 yen/tonne (a hypothetical CO2 emission tax rate). Crude oil: import price.
    Natural resources: estimated price. Waste: controlled landfill costs in the Tokyo area.
  • A portion of the EEB is accounted for in our profit and loss statement.
External Economic Benefits (FY2023)
Impact Inventory Reduction (t) Inventory Market Price (yen/t) External Economic Benefit (billion yen)
Climate change mitigation CO2 2,039,515 3,000 61
Depletion of energy resources Crude oil 115,754 18,400 21
Depletion of mineral resources Natural resources 4,545,574 1,000 45
Shortage of landfills Waste 4,966,493 15,000 745
Total 872
External Economic Benefits (FY2023)

Project Accounting — Ofunato Plant No. 5 kiln high-efficiency clinker cooler introduction

 The clinker cooler uses air to cool clinker, an intermediate product fired inside an ultra-high-temperature rotary kiln. The high-temperature air obtained through heat exchange during cooling is effectively used as combustion air for the rotary kiln.
 The high-efficiency clinker cooler introduced to the No. 5 kiln at the Ofunato Plant in FY2023 is a new type of cooler that can recover high temperature air while cooling clinker with a small amount of air. This cooler significantly improves heat recovery efficiency compared to conventional types. With this high-efficiency clinker cooler, the second we have introduced in Japan, we will reduce the amount of thermal energy required for clinker firing, further reducing CO2 emissions and environmental impact.

Ofunato Plant No. 5 kiln

Ofunato Plant No. 5 kiln

Investment amount: Approx.
9.2 billion yen

Reduction in CO2 emissions:
7,149 tonnes/year

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