Tokyogasgroup csr report

Effective Energy Use by Combined Heat and Power (CHP) Systems

Tokyo Gas started its energy-saving efforts with the introduction of a CHP system*1 at the Hamamatsucho Head Office Building as early as in 1984. We upgraded the system in April 2009 to the best available technology*2. It largely contributed to save energy by reducing the building’s annual CO2 emissions by about 1,400 tons. In the time of tight power supplies in the summer of 2011, after the Great East Japan Earthquake, we significantly reduced electricity use by putting all the Group’s CHP systems to work.

*1 Gas engine-based CHP systems generate electricity and recover exhaust heat generated as a by-product.

*2 Upgraded CGS: Two 930 kW-class gas engines, total efficiency of 72% (38% power generation, 32% exhaust heat capture)

DFF Inc., Corporate Social Responsibility Sect, General Administration Dept., Corporate Planning Dept., Resources & Global Business Division, Energy Solution Div, Power Buisiness Dept., Pipeline Network Division, IT Division, Residential Sales Div., Fundamental Technology Dept., Energy Solution Div, Environmental Affairs Dept., Purchasing Dept. , Health Insurance & Employees' Welfare Sect., Personnel Dept., Internal Audit Dept., Audit & Supervisory Board Member's Office, Compliance Dept., Regional Development Div., Finance Dept, TGES, TOKYO GAS COMMUNICATIONS, INC.

Renewal of Old Buildings to Energy-Saving and Environmentally Friendly Offices

Tokyo Gas introduced the Design Guidelines that care about energy conservation, seismic safety and durability in 2010 as part of its activities taking the environment into consideration. We follow the new guidelines in drawing up plans to reconstruct buildings owned by the Group.

TG Hiranuma Building that Received the Environment Minister’s Award for a Global Warming Prevention Activity

The TG Hiranuma Building is a middle-scale, energy-saving and eco-friendly office building (five stories above ground, about 7,200 m2). Completed in March 2013, it was the first reconstructed building based on the 2010 Design Guidelines. It has a solar cooling system, which utilizes solar energy and exhaust heat from its CHP system and significantly reduces mainly daytime CO2 emissions from regular air-conditioning and heating loads. Individual, selective air-conditioning by the GHP XAIR, a highly efficient gas heat pump air-conditioner, deals sensitively with air-conditioning and heading loads, which vary according to the time of day and number of people inside. The building also uses such equipment as solar power generators and other renewable energy equipment as well as natural ventilation systems. Without sacrificing internal comfort, it uses about 30% less energy than other office buildings of similar scales.
The building was selected as a Leading Project for CO2 Reduction*1 by the Ministry of Land, Infrastructure, Transport and Tourism in fiscal 2011. It was given the Environment Minister’s Award for Global Warming Prevention Activity (Early Adopter of Solution Technology category) in December 2015. In fiscal 2016, it obtained the BELS*2 certification for buildings that meet the government’s energy-saving criteria. (The assessment was four stars, out of five.)
The Group works to promote the wider use of energy-saving and CO2-cutting technology adopted in the TG Hiranuma Building, aiming for a zero-energy building (ZEB)*3 deployment.

*1 The government gives subsidies for leading housing and construction projects for CO2 emission reduction after publicly soliciting applications.

*2 The Building Energy-Efficiency Labeling System. In the system, a third-party evaluation body assesses and certifies the energy-saving capabilities of green buildings under the Act on the Improvement of Energy Consumption Performance of Buildings (Building Energy Efficiency Act).

*3 A zero-energy building (ZEB) aims to achieve zero net primary energy consumption, or the equal balance between total energy used and renewable energy generation, on an annual basis. The government is promoting these buildings, putting the initiative into its basic energy program.

 
TG Hiranuma Building TG Hiranuma Building

Earth Building Tachikawa (TG Tachikawa Building) Acquisition Top CASBEE Certification

The Earth Building Tachikawa (TG Tachikawa Building), was renewed in July 2015 as a middle-scale office building (five stories above ground, about 10,600 m2). Aiming for a ZEB, we have given environmental consideration, such as the use of renewable energy and highly efficient equipment and appliances, in operating the Earth Building Tachikawa. The building also excels in ensuring business continuity in case of an earthquake with its system that combines seismic isolation and vibration suppression equipment. It received the top S certification in CASBEE*4 for buildings, the first for a Tokyo Gas building. In fiscal 2016, it acquired BELS certification. (The assessment was four stars, out of five.)

*4 Comprehensive Assessment System for Built Environment Efficiency: assesses the environment performance of buildings and gives ratings on a scale of five.

 
TG Tachikawa Building TG Tachikawa Building

Earth Port as ZEB

In 2010, we began renovating the Tokyo Gas Kohoku New Town Building, dubbed Earth Port. The primary goal is to achieve zero net primary energy consumption on an annual basis by 2030 by increasing the efficiency of equipment and optimizing energy use at a number of buildings. We were able to reduce the building’s primary energy consumption by about as much as 49% and CO2 emissions by around 54% in fiscal 2015 by incorporating renewable energy sources such as solar thermal and photovoltaic power generation and optimizing the operation of the CHP system.
 
Earth Port (after refurbishment) Earth Port (after refurbishment)
DFF Inc., Corporate Social Responsibility Sect, General Administration Dept., Corporate Planning Dept., Resources & Global Business Division, Energy Solution Div, Power Buisiness Dept., Pipeline Network Division, IT Division, Residential Sales Div., Fundamental Technology Dept., Energy Solution Div, Environmental Affairs Dept., Purchasing Dept. , Health Insurance & Employees' Welfare Sect., Personnel Dept., Internal Audit Dept., Audit & Supervisory Board Member's Office, Compliance Dept., Regional Development Div., Finance Dept, TGES, TOKYO GAS COMMUNICATIONS, INC.

Saving Energy through Better Management of Equipment and Facilities

Saving Energy through Better Use of Equipment and Facilities

We hold an energy-saving committee at each building where we lease an office, among the building’s owner and equipment administrator and the relevant section of ours. The committee helps examine energy use, optimize temperature and humidity and arrange energy conservation patrols, encouraging each of our employees to promote energy-saving activities.
The Tokyo Gas Group as a whole engages in energy conservation though campaigns in the summer and winter, when power use peaks.
In capital spending, we promote the introduction of more efficient lighting equipment at our offices and facilities, such as LED and high frequency-ballast fluorescent lights, to increase energy-saving.
 

Example of visualization at the Hamamatsucho head office building

Example of visualization at the Hamamatsucho head office building

Poster for an energy conservation campaign

Poster for an energy conservation campaign
Topic
First Group Purchase of Renewable Energy with Non-Fossil Fuel Certification

In July 2018, the Gas Science Museum began purchasing renewable energy based on non-fossil fuel certification under the FIT*1 program to cover approximately 30% of the electricity used at the facility. As a result of this shift, the museum’s actual CO2 emissions from purchased electricity for fiscal 2018 declined by 78% from the previous fiscal year. The remaining 70% of the energy used at the facility is generated by highly efficient fuel cells using clean natural gas.

Power Supply System for the Gas Science Museum

Power Supply System for the Gas Science Museum

*1 A Green Menu offered under the ENNET program based on a CO2 emission factor of zero. Of electricity provided under the program, Tokyo Gas purchases electricity from renewable energy sources by using non-fossil fuel certification in the FIT program.

DFF Inc., Corporate Social Responsibility Sect, General Administration Dept., Corporate Planning Dept., Resources & Global Business Division, Energy Solution Div, Power Buisiness Dept., Pipeline Network Division, IT Division, Residential Sales Div., Fundamental Technology Dept., Energy Solution Div, Environmental Affairs Dept., Purchasing Dept. , Health Insurance & Employees' Welfare Sect., Personnel Dept., Internal Audit Dept., Audit & Supervisory Board Member's Office, Compliance Dept., Regional Development Div., Finance Dept, TGES, TOKYO GAS COMMUNICATIONS, INC.