Tokyogasgroup csr report

Using Energy Effectively by Combined Heat and Power (CHP) Systems

Using Energy Effectively by Combined Heat and Power (CHP) Systems

Tokyo Gas started its energy saving efforts early with the introduction of a CHP system*1 at the Hamamatsucho Head Office Building in 1984. We upgraded the system to one employing the most advanced technology*2 and started using the new system in April 2009. The replacement allowed the building to reduce its annual CO2 emissions by about 1,400 tons.
In the face of tight power supplies in the summer 2011 after the Great East Japan Earthquake, we saved electricity use significantly by putting all the Group’s CHP systems to work.
*1 Gas engine-based CHP systems generate electricity and recover waste heat generated as a by-product.
*2 Upgraded CGS: Two 930 kW-class gas engines, total efficiency of 72% (38% power generation, 32% waste 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.

Making Old Buildings Both Energy-Saving and Environmentally Friendly

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.

The TG Hiranuma Building That Received Environment Minister’s Award for Global Warming Prevention Activity

The TG Hiranuma Building is a middle-scale, energy-saving and eco-friendly office building (5 stories above ground, about 7,200 m2). The building completed in March 2013 was the first reconstructed building based on the 2010 Design Guidelines. The building has a solar cooling system, which uses solar energy and exhaust heat from its CHP system, 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 the number of people inside. The building also uses such equipment as solar power generators and other renewable energy equipment and 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; top assessment is five stars.)
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.

*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 such buildings, putting the initiative into its basic energy program.

 
TG Hiranuma Building
TG Hiranuma Building 

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

The Earth Building Tachikawa (TG Tachikawa Building), rebuilt because of aging, was completed in July 2015 as a middle-scale office building (five stories above ground, about 10,600 m2).
Aiming for a ZEB, we give 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.
The building 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, the top assessment is five stars).

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

 
TG Tachikawa Building
TG Tachikawa Building
 

Earth Port as ZEB

We started to take improvement measures at the Tokyo Gas Kohoku New Town Building, dubbed Earth Port, in 2010 to achieve zero net primary energy consumption on an annual basis by 2030 by making equipment more efficient and optimizing energy use at a number of buildings. Measures including renewable energy use, such as solar thermal and photovoltaic power generation, and optimum operation of its CHP system allowed the building to reduce its primary energy consumption by about 49% and CO2 emissions by about 54%.
 
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 Use of Equipment, Facilities

Saving Energy through Better Use of Equipment, 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 Hamamatsucho head office building

Example of visualization at Hamamatsucho head office building

Poster for an energy conservation campaign

Poster for an energy conservation campaign
Topic
Buying Renewable Energy with Non-Fossil Fuel Certification

The Gas Science Museum started to purchase electricity from ENNET Corporation under its Green Menu*1 electricity program. This is the Tokyo Gas Group’s first electricity purchase through non-fossil fuel certification in the FIT*2 program. The museum covers about 70% of is power consumption with electricity generated by highly efficient fuel cells using natural gas. This time, the museum has decided to shift its electricity procurement that covers the rest of about 30% to the purchase from ENNET. The shift is estimated to reduce CO2 emissions in fiscal 2018 at the museum by 17%*3 from fiscal 2017 to 75 tons.

Chart on Power Provision to Gas Science Museum

Chart on Power Provision to Gas Science Museum

*1 An ENNET program featuring 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.

*2 The feed-in tariff program, in which the government assures that power companies purchase electricity from renewable energy, such as sunlight, wind power, hydraulic power, geothermal heat and biomass.

*3 The estimate assumes energy consumption at the museum remains the same from fiscal 2017.

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.