Zero Emission Tokyo

Now Next

To mitigate climate change and ensure a stable supply of energy the Tokyo Metropolitan
Government has currently been engaged in a variety of initiatives to realize a decarbonizedsociety.
For society to achieve this, as a whole, it is important for each and every one of us to beaware and try to do what we can.
To this end, we have gathered specific information concerning the following topics, among
others: “Why decarbonization is necessary,” “Impact on our daily life,” and “What kind ofactions would lead to decarbonization.”

We hope it will help you learn more about, and raise your awareness of decarbonization.
Let’s work together to push forward decarbonization efforts so that we can achieve a safe
and comfortable society where people can lead a healthy life.
ⒽHerasu(save)ⓉTsukuru(generate)ⓉTameru(store)
Electricity

Table of Contents
Zero Emission Tokyo

Now Next

point
now What we can do now: saving energy at home
Energy-saving
action………………………4

Where is electricity used at home?

………………………5

Home appliances that consume the most electricity: Lighting………………………6

Energy-saving The 2nd largest power consumer : Refrigerator
action………………………7

Energy-saving
The 3rd largest power consumer : Air conditioner
action………………………8

now

What we can do now: saving energy according to the season

Energy-saving Summer energy-saving actions ①
action………………………9

Energy-saving Summer energy-saving actions ②
action………………………10

Energy-saving
actionWinter energy-saving actions ①………………………11

Energy-saving
actionWinter energy-saving actions ②………………………12

Energy-saving
actionWinter energy-saving actions ③………………………13

next Future steps: making your home more energy-efficient
corporate Promoting efforts at companies too!

………………………14………………………17

PointImpact on our planet and society✅ Our planet is getting warmer due toa rapid increase in CO2, methane,and other types of greenhouse gases.

✅ Extreme weather has been occurringaround the world (e.g., super typhoons,
extreme heat, drought, flooding).

Difference from the1991 – 2020 yearly average (°C)

Global warming is getting serious

Average global surface
temperature
1998✅ Heat waves and torrential rain havebeen occurring across Japan as well.

2021

1944

✅ Tokyo is no exception, with heatwaves occurring more frequently.

1880

Source: Japan Meteorological Agency (as of
September 2022)

Key to reducing CO2✅ Approx. 70% of Tokyo’s CO2 emissions come fromthe residential sector and commercial sector.
✅ Only the residential sector showed an increase inenergy consumption when compared to 2000 data.
✅ The more time people spend at home, the morehousehold energy consumption is expected to rise.

Tokyo’s CO emissions by2
都内CO2排出量部門別構成比
sectorWaste Sector

Finalenergy consumption by sectors
部門別最終エネルギー消費の推移
FY 2000 = 100)

Industrial
SectorResidential
SectorTransport
Sector2020
preliminary
figures

Residential
SectorCommercial
SectorCommercial
sectorTransport
SectorIndustrial
SectorSaving power at home will indeed help reduce CO2 emissions.

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now

What we can do now: saving energy at home

Where is the electricity used at home?
Lighting, refrigerators, and air conditioners are the top three electricity consuming
home appliances, accounting for around half of the total electricity consumption,
when combined.
Learning about where electricity is used will help you save it!

Breakdown of annual energy consumption
in Tokyo’s residential sector by applianceLighting
Dishwasher
1.4%

Other
appliances
31.2%

Refrigerator

17.4％
Clothes dryer
2.3%
Bidet toilet seat
4.8%

TV
11.3%

Lighting

18.2％
Refrigerator

Air
conditioner

Air
conditioner

13.3％

Source: “Comprehensive survey on the final energy consumption andgreenhouse gas emissions in Tokyo” (FY 2019 preliminary figures)

Appliances withlarge power consumption
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now

What we can do now: saving energy at home1

Simple energy-saving steps to reduce CO2 emissions and electricity bills too!
The largest power consumption

Lighting*Yearly figures

Energy saved(1) Use the lighting less, by one hour a day(2) Replace incandescent lamps with LED bulbs

19.7kWh
Fluorescent lamp 4.4kWh
LED bulb
2.9kWhIncandescent
lamp

Money saved

CO2 reduced

640 yen
140 yen
90 yen

9.6kg
2.2kg
1.4kg

92.0kWh 3,010 yen

45.0kgIs it possible to save energy by switching lights off even fora short time?
A lot of power runs through every time you switch a light, but doesn’t last longenough to have an impact on your electricity bill. Therefore, it will save power byswitching the light off even if only for a short time. In the case of using fluorescentlamps, their life will be shortened if we repeatedly turn them on/off over a shortperiod.
Energy saving tips

(1) Incandescent bulb: 54W bulb, fluorescent lamp: 12W bulb, LED bulb: 8W bulb
(2) Case where 54W incandescent bulbs are replaced with 8W LED bulbs (hours of use: 2,000 hours/year)

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now

What we can do now: saving energy at home

Simple energy-saving steps to reduce CO2 emissions and electricity bills too!
The 2nd largest power consumption

Refrigerator*Yearly figures
Energy saved(1) Place it at an appropriate distance from the wall
(2) Adjust the temperature setting according to the season(3) Don’t overfill(4) Don’t open it too often(5) Open the door for as little time as possible

Energy saving tips

45.1kWh61.7kWh43.8kWh10.4kWh
6.1kWhMoney saved

1,470 yen
2,020 yen
1,430 yen
340 yen
200 yen

CO2 reduced

22.1kg30.2kg21.4kg5.1kg
3.0kg

Is it possible to save power by keeping your freezer full?

In the case of a drawer-type freezer, we can save energy by packing it withfrozen items. The frozen items will cool each other , which will help to preventthe temperature from rising when the freezer is opened.
However, keeping your freezer organized will help you save time finding what
you need.
(1) Comparison of the following cases: a) a refrigerator is placed in close proximity with the ceiling and the walls on bothsides, and b) a refrigerator is placed in close proximity with a wall on one side.
(2) Changing the refrigerator’s temperature setting from “Strong” to “Medium” in an ambient temperature of 22℃.

(3) Comparison between when the refrigerator is fully packed and when it is half-packed(4) Comparison of the following cases: a) opening/closing the refrigerator door for the number of times as prescribed in the former JIS
Opening/Closing Test, and b) opening/closing the door twice as much
(5) Comparison between when the refrigerator door is left open for 20 seconds, and when it is left open for 10 seconds.

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now

What we can do now: saving energy at home

Simple energy-saving steps to reduce CO2 emissions and electricity bills too!
3rd largest power consumption

Air Conditioner*Yearly figures(1) Keep the room temperature around 28℃ in the summer(2) Cut the use of the air conditioner for one hour a day in thesummer(3) Keep the room temperature around 20℃ in the winter(4) Cut the use of the heater for one hour a day in the winter(5) Clean the filters regularly (twice a month or so)

Energy saving tips

Energy saved

Money saved

30.2kWh18.8kWh53.1kWh40.7kWh
32.0kWh990 yen
610 yen
1,740 yen
1,330 yen
1,050 yen

CO2 reduced

14.8kg9.2kg
26.0kg19.9kg15.6kgIs it possible to save energy by switching your air conditioner off evenfor a short time?

Air conditioners consume a lot of energy when adjusting the temperature. However, air conditioners use a relatively
small amount of energy to maintain the set temperature. Therefore, it's not energy efficient to frequently switch the AC on
and off over a short period of time. According to research done by CRIEPI*, the energy consumed with intermitted
operation (five cycles of on for 30 minutes, off for 5 minutes) is approx. 30% greater than continuous operation.
*Source: Central Research Institute of Electric Power Industry, “Comparison of the energy-saving effects of intermittent
operation and continuous operation of air conditioners”

Leave your air conditioner on if you’re going to be back within 30 minutes(1) Changing the room temperature setting of an air conditioner (2.2 kW) from 27℃ to 28℃ when the outside
temperature is 31℃ (hours of use: 9 hours/day)(2) When the temperature setting is 28℃(3) Changing the room temperature setting of an air conditioner (2.2 kW) from 21℃ to 20℃ when the outside
temperature is 6℃ (hours of use: 9 hours/day)(4) When the temperature setting is 20℃(5) Comparison between when the filter of an air conditioner (2.2 kW) is clogged up, andwhen the filter has been cleaned

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tips

Summer energy-saving actions

Even small energy-saving efforts can make a big difference in the hot summer.
●Tips for using the air conditioner
Air conditioners account for over half of your daytime power consumption during summer. Small efforts canhelp you save energy.
*Be careful not to get heatstroke for the sake of saving energy.

Air conditioner(1) Keep the room temperature around 28°C
in the summer(2) Cut the use of the air conditioner for one
hour a day in the summer

Energy
saved

Money
saved

30.2 kWh

990 yen

14.8 kg

18.8 kWh

610 yen

9.2 kg

CO2 reduced●Heat entering through windows
Heat entering from windows accounts for more than 70% of the heat that enters from the outside during
the summer. Improve cooling efficiency by blocking sunlight from windows.

Window✅ Blinds✅ Sunshade✅ Bamboo screen✅ Green wall

(1) Changing the cooling temperature setting of an air conditioner (2.2 kW) from 27℃ to 28℃ when the outside
temperature is 31℃ (hours of use: 9 hours/day)(2) When the temperature setting is 28℃

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tips

Summer energy-saving actions

Even small energy-saving efforts can make a big difference in the hot summer.
●Don’t forget the shower!
People take more showers in the summer. Follow these tips to be more energy-efficient.
Lever

Shower head

✅ If you have a single lever for adjusting thewater temperature/volume, slide it to theright side (cold water) when you don’t need
hot water.

hot
water

Cold water
mixture✅ You can reduce your hot water consumption
by 20 to 30% by installing a water-saving
shower head.

●Change your appliance settings in the summer
Do you regularly change your appliance settings? You can save energy by adjusting the settings.
*Yearly figures

Refrigerator● Change the temperature setting to“Medium”

Electronic bidet✅ Switch off the seat heaterand warm water bidet function

Energy saved

Money saved

61.7 kWh 2,020 yen

CO2 reduced

30.2 kg

TV✅ Reduce the brightness of
your TV screen (don’t forget
to ensure viewing comfort)● Changing the refrigerator temperature setting from “High” to “Medium” in an ambient temperature of 22℃.

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tips

Winter energy-saving actions

Even small energy-saving efforts can make a big difference in the cold winter, too●Gather in a warm room
The key to saving energy in winter is to reduce energy consumption for heating.
You can save energy and money by having family members gather in the same room.
*Don’t forget to ventilate the room regularly even when trying to saving energy.
*Yearly figures
Air conditioner(Heater )Energy saved

Money saved

CO2 reduced(1) Keep the room temperature around 20°C in the winter53.1 kWh

1,740 yen

26.0 kg(2) Cut the use of the heater for one hour a day in the winter40.7 kWh

1,330 yen

19.9 kg

89.9 kWh

2,940 yen44.0 kg

186.0 kWh

6,080 yen

91.0 kg

32.5 kWh

1,060 yen

15.9 kg

49.0 kWh

1,600 yen

24.0 kgHeated carpet(3) Use a heated carpet that matches the room size(4) Change the temperature setting from “High” to “Medium”

Electric kotatsu(5) Use a blanket cover and floor mat in addition to the kotatsu
blanket(6) Use a low temperature setting for the kotatsu(1) Changing the room temperature setting of an air conditioner (2.2 kW) from 21℃ to 20℃ when the outside temperature is 6℃(hours of use: 9 hours/day)(2) When the heating temperature is set to 20℃. Compared with the gas and oil necessary for a gas heater and oil fan heater,
respectively.
(3) Comparison between a heated carpet for 3.11 m2 and 4.63 m2 used for 5 hours a day at “Medium” when the room temperature
is 20℃.

(4) When the heating setting of a heated carpet for 4.63 m2 is changed from “High” to “Medium”(hours of use: 5 hours/day)(5) Comparison of the following cases: a) using only a kotatsu blanket, and b) using a kotatsu blanket
cover and floor mat in addition to the blanket (hours of use: 5 hours/day)(6) When the heating setting is changed from “High” to “Medium” (hours of use: 5 hours/day)

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tips

Winter energy-saving actions

Even small energy-saving efforts can make a big difference in the cold winter too●Keep your refrigerator organized
Don’t overfill your refrigerator, otherwise the food inside won’t be uniformly cooled.
*Yearly figures

Refrigerator

Energy saved

Money saved

CO2 reduced● Don’t overfill

43.8 kWh

1,430 yen

21.4 kg● Comparison between when the refrigerator is fully packed and when it is half full

●Layer up to stay warm
Try layering before turning up the heat by 1°C.
You’ll feel much warmer simply by putting on an extra layer of clothing.

Lap blanket＋2.5℃

Cardigan

＋2.2℃

Socks

＋0.6℃
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tips

Winter energy-saving actions

Even small energy-saving efforts can make a big difference in the cold winter, too●Saving gas
As the tap water temperature is lower, more energy is needed to heat up water in thewinter than in the summer. Here are some tips for efficiently using hot water.
Dishwashing, washroom

Bathroom✅ Use a lower water temperature
setting✅ Avoid using the reheating and heat retentionfunctions by using the bath one after another✅ Don’t leave hot water running✅ Close the bath lid even for a short time

●Improve window insulation to maximize heating efficiency
Prevent heat leaving and cold air entering from your windows.
Window✅ Use gap tape to prevent air✅ Use long, thick curtains
flow✅ Stick an insulation sheet on the glass*Installing insulated glass, adding an extra pane to your windows, etc., are also
effective
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next

Future steps: making your home more energy-saving

Consider making your home more energy-efficient for a more comfortable, safe and healthier future
ConsiderWhether you live in a detached house or an apartment, you cansave even more energy by installing a solar panel in addition to
the use of other heat-insulating, energy-saving properties

the energy
efficiency of
your home

戸建住宅
House

Apartment
集合住宅(マンション)
building
Solar power
generation

Solar power generation

Block sunlight

Energy-saving ventilation
Energy-efficient air conditioning

Heat insulating
windows
Energy-saving ventilation

Energy-efficient hot water supply
LED lighting

Thermal insulating
coating

Energy-efficient
air conditioning
LED lighting

tipsPower storage
systemEnergy-efficient
hot water supply

Various benefits of energy-saving homes● Improved cooling/heating efficiency can
reduce the temperature difference between
rooms.

● Preventing decay anddeterioration of wood due tocondensation● Solar panels allow electricity
usage during blackouts

Leading to a more comfortable, healthier life

Preventing deterioration of yourhouse

Get a storage battery to improve yourdisaster preparedness even further(while preventing heat shock)

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next

Future steps: making your home more energy-saving

Improve energy efficiency by Ⓗ Herasu (saving) and Ⓣ Tsukuru (generating) electricity
Generate

Save✅ Improve thermal
performance of walls,
windows, etc.
✅ Improve energy-saving
performance of
appliances, etc.

✅ Generate renewableenergy*Example of a detached house
A “Tokyo Zero Emission House” equipped with a solar power generation unit can reduce your energy consumption to net zero

✅ A “Tokyo Zero Emission House” is equipped with heat insulating windows and walls, as well as other energy-savingfeatures. By installing a 4 kW solar power generation unit to the house, you could save more money than you needfor the installation/construction work and also achieve net zero energy consumption.

Net energy
consumption

Standard house*

Cut on yourutility bills too!

Save approx.
10,000 yen
a month!

“Tokyo Zero Emission”
House with a solar power
generation unit

Energy efficiency of your home
*House that meets the mandatory requirements of the Act on the Improvement of Energy Consumption Performance of Buildings scheduled to come into effect in 2025.
This calculation is made on the assumption that the house is for a family of three with a floor area of 100 m2.

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tips
Energy-saving home

Tokyo Zero Emission House (standard 1)

Window

Aluminum window frames+ multilayer glass

Aluminum resin composite window frames +Low-E double glass

Energyconservation

Air conditioner★★★

★★★★ or higher(example)

BoilerConventional gas-type

Gas latent heat collection type

Insulation

House facilities

Energy efficiency of your home (financial benefits)(example)

Solar power generation unit

N/A

Not installed

Installed (4 kW)

Annual amountN/A (reference)-55,000 yen-130,000 yen(30 years)

N/A (reference)-1.65 million yen-3.65 million yen

Additional construction expenses, etc.

N/A (reference)+800,000 yen+1.78 million yen

Tokyo Zero Emission House subsidy*2

N/A-300,000 yen-700,000 yen

Central government subsidy*3

N/A-800,000 yen-800,000 yen

Reduction of housing loan interest rate*4

N/A-220,000 yen-30,000 yen

Overall balance over 30 years

N/A (reference)-2.17 million yen-3.40 million yen

Energy consumption

N/A (reference)-30%“0” (-102%)

Reduction of utility
expenses, etc.*1*3: Children’s Future House Assistance Program*1: Income from selling electricity at the FY2022 unit price; includes power converter replacement cost (230,000 yen).
Unit price: 17 yen/kWh (Year 1 to 10), 8.5 yen/kWh (Year 11 to 30); electricity charge: 33 yen/kWh; gas charge: 158 yen/m3 *4: Estimation based on the following assumption: with 30 million yen loan for
the reference house using the Flat 35 S Interest B Plan
*2: subsidy of 200,000 yen to 2.1 million yen depending also on the environmental features and type of your house (standards 1
to 3). If a solar power generation unit or storage battery is installed, the subsidy will be increased according to the capacity(e.g., 100,000 yen/kW for a solar power generation unit).

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corporate

Promoting efforts at companies too!

Utilize the Tokyo Metropolitan Government’s subsidy and assistance programs to promote efforts
We have created Eco Support 2022, a pamphlet on the Tokyo Metropolitan
Government’s Environment-related Subsidies and Assistance Programsfor Households and Businesses.

For more details, please
see the menu in Eco
Support 2022.

Please check out the Tokyo Metropolitan Government’s subsidies andassistance programs.

Daily efforts to reduce energy use in the workplace
EquipmentAir
conditioning

Reduced poweruse

Measures-2%

Maximize Cool Biz efforts to allow a higher temperature
setting (28℃ for office space, 28℃ or higher for other spaces)-0.6%

Switch off air conditioners in office spaces when not in use-0.1%

Clean air conditioner filters-2.5%

Review lighting intensity (around 500 lux for office space)-0.4%

Switch lights off during lunch break, etc.

Lighting

Turn off heating for bidet toilet seats, and stop the hot water
Powersockets -0.3% or more supply to lavatories, etc.
Reduce the brightness of PC screens
Ventilation-0.4%

Reduce excessive ventilation by using fans appropriately inline with the ventilation purpose (*)

Update/install equipment to reduce energy use
Equipment

Reduced poweruse

MeasuresAir
conditioning-7 to -14%

Install highly efficient ventilation and air
conditioning equipment(assistance program: Energy-saving
Ventilation/Air Conditioning Equipment
Installation Assistance Program for Small to
Medium-sized Offices)Lighting-14%

Replace regular lamps with LED bulbs(assistance program: Energy-saving Incentive
Tax Program for SMEs）*Please ensure sufficient ventilation for preventing the spread of COVID-19.
Reference: carbon dioxide concentration based on the Act on Maintenance ofSanitation in Buildings (1,000 ppm or less)*The “reduced power use” is a rough estimate of the reduction of energy consumption
in the entire office when the relevant measure is taken. (An office building (individual
air conditioning: 20%) is assumed.)17