)esu gndliub yb egareva( IEB230213020302920282027202620252024202320222021202020291028102raey0201520162017201820192020202120222023yeari02raey32022202120202029102810271026102510241023102210211020102raey32022202120202029102810271026102510241023102210211020102Mandatory BEI for large-scale facilities (≥2,000m2) Mandatory BEI for medium-scale facilities (≥300m2 and <2,000m2) Mandatory BEI for small-scale facilities (<300m2)Schools, etc.Manufacturing facilities, etc.Hospitals, etc.Assembly halls, etc.Offices, etc.Retails, etc.Restrants, etc.Hotels, etc.Price of office paper purchased (at all Nikken Sekkei offices)Weight of office waste (Tokyo Building only)Hospitals, Restrants etc.Hospitals, Restrants etc.Hotels, Offices, School etcHotels, Offices, School etcManufacturing factories etcManufacturing factories etcTrends in average BEI by building usePaper and other office wasteOsaka, Nagoya, FukuokaRetails, etc.Restrants, etc.Hotels, etc.Energy consumption was reduced by 24% from 2010 levels across all Nikken Sekkei officesGJ/year80,00070,00060,00050,00040,00030,00020,00010,0000Energy consumption was reduced by 30% from 2010 levels at the Nikken Sekkei Tokyo BuildingMJ/m2-year1,600Improving environmental performance by monitoring BEIA Digital Workplace Inspired Paperless Environment Thousand yen30,00047.240.541.741.139.237.937.837.337.91,4001,2001,00080060040020001.00.90.80.70.60.50.40.30.20.10.020,00010,00033.629.529.5ElectricityCompared to 2015▲30%▲46%MJ/person-year48.042.036.030.024.018.012.06.00.027.326.3‒44%Natural gasTon(t)300200100-24%-30%Energy consumption* decreased by 24% from 2010 levels across all Nikken Sekkei offices. Energy consumption has remained flat since 2020 due to the active integration of Group companies and reinforcement of staffing systems. Energy consumption per em-ployee has fallen 44% from 2010 levels.* Primary energy conversion factors are set to 9.97 MJ/kWh for electricity Through efforts including changing luminosity levels and install-ing LED lighting, energy consumption at the Nikken Sekkei To-kyo Building was cut to 1,079 MJ/m2, a 30% reduction vs 2010, the year before the Great East Japan Earthquake. Despite the gradual recovery in rates of employees returning to the office since the outbreak of COVID-19 in 2020, we have achieved energy saving targets without a significant increase in energy consumption. We will strive to promote greater energy efficiency with the aim of achieving carbon neutrality by 2025.We manage the energy efficiency performance of projects using BEI*, a rating index under the Building Energy Efficiency Act. BEI levels for projects completed in 2023 by type were as fol-lows: 0.73 (offices), 0.84 (schools), 0.90 (hotels), 0.80 (halls), 0.86 (hospitals), and 0.81 (retail facilities). Although BEI levels trend-ed downward slightly compared to 2022, it is clear that further energy-saving designs and measures will be needed to satisfy standards (BEI=0.75 to 0.85 or less), which will be enforced for large-scale buildings from 2024. By understanding current issues through the ongoing quantitative monitoring of BEI, we aim to im-prove environmental performance levels by actively introducing bottom-up, energy-saving approaches best suited for individual projects. * The BEI (Building Energy Index) measures the energy efficiency of build-The advent of the digital workplace has accelerated so-called “paperless” environments and waste reduction. Office paper use was reduced by 30% (in all Nikken Sekkei offices), while office waste was cut by 46% (Tokyo Building) compared to 2015 levels.(daytime) and 45 MJ/m3 for city gas.TokyoHokkaido, Civil EngineeringEnergy consumption per employeeings. Smaller values indicate higher energy savings. Mandatory BEI for large-scale facilities (≥2,000m2) Mandatory BEI for medium-scale facilities (≥300m2 and <2,000m2) Mandatory BEI for small-scale facilities (<300m2)Schools, etc.Manufacturing facilities, etc.Hospitals, etc.Assembly halls, etc.Offices, etc.MONITORING OF ENERGY AND RESOURCE USE
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