2202120202029102810271026102510241023102210211020102)esu gndli年i2230213020302920282027202620252024202320222021202020291028102IEBub yb egarevA(MJ/㎡・year1,6001,4001,2001,0008006004002000Energy use at the Nikken Sekkei Tokyo Building1.41.31.21.110.90.80.70.60.50.40.30.20.10Hospitals, etc.Assembly halls, etc.Offices, etc.Retails, etc.Hospitals,Restrants etc.Hotels, Offices, Schools etc.Manufacturingfactories, etc.Restrants, etc.Hotels, etc.Schools, etc.Manufacturing factories, etc.ElectricityNatural gas-30%Trends in average BEI by building useMandatory BEI for large-scale facilities[≧2,000m2]Mandatory BEI for medium-scale facilities[≧300m2and ＜2,000m2]Mandatory BEI for small-scale facilities[＜300m2]Energy consumption was reduced by 30% from 2010 levels at the Nikken Sekkei Tokyo Building, and by 29% across all Nikken Sekkei offices.Improving environmental performance by monitoring BEIA Digital Workplace Inspired Paperless Environment Toward a Net Carbon Neutral Nikken Sekkei Tokyo Building in 2024 MONITORING OF ENERGY AND RESOURCE USEPaper and other office wasteThrough efforts including changing luminosity levels and installing LED lighting, energy consumption at the Nikken Sekkei Tokyo Building was cut to 1,077 MJ/m2, a 30% reduction vs 2010, the year before the Great East Japan Earthquake. With the merger of Nikken Group companies Hokkaido Nikken Sekkei Carbon neutral renovations at the Tokyo Building began in 2019 with the aim of cutting energy consumption by 40% (compared to 2013) by 2030. Plans call for implementing “soft infrastructure” measures, such as promoting behavioral change via smart phone app, in 2023. In October 2022, all building electricity was switched to green power*2. From April 2023, all city gas used will be switched to carbon neutral city gas*3. Through such measures, the entire building is scheduled to become net carbon neutral in 2024. Along with promoting further energy savings, studies will be made on investment in renewable energy sources with added potential.We manage and publish building energy performances of projects using the BEI*1, a Building Energy Efficiency Act rating index. BEI levels for projects completed in 2022 were as follows; offices: 0.81, schools: 0.80, manufacturing facilities: 0.72, hospitals: 0.91, retailers: 0.94. BEI saw a slight upward trend vs. 2019-2021. It is clear that further energy-saving designs will be needed to satisfy BEI standards, which will be enforced for large buildings starting in 2024. Efforts in retail buildings and hospitals will be particularly important. By understanding current issues through ongoing quantitative BEI monitoring, we aim to improve environmental performance levels by actively introducing energy-saving methods best suited for individual projects.Ltd and Nikken Sekkei Civil Engineering Ltd., energy consumption for all Nikken Sekkei buildings was reduced by 29% vs. 2010. As energy consumption has remained flat since 2020, we will promote even more energy savings going forward, with the aim of achieving carbon neutrality by 2050.The advent of the digital workplace has accelerated so-called “paperless” environments and waste reduction. Office paper use was reduced by 41% (in all Nikken Sekkei offices), while office waste was cut by 36% (Tokyo Building) compared to 2015 levels.
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