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What is Octopus Energy?

Octopus Energy is a UK-based electric power company that first entered the power generation and sales market in 2016. It has since expanded its business to eight countries, including Japan, and now supplies electricity to over 3 million customers.

The company has a particular focus on promoting renewable energy and is working to develop environmentally-friendly electricity sales. Such initiatives have gained this growing new upstart company worldwide attention, including a business partnership with Tesla and a loan of approximately ¥68 billion from former US vice president Al Gore’s investment fund, Generation Investment Management.

In Japan, Octopus Energy joined forces with Tokyo Gas starting in February 2021 and began selling electricity rate plans to homes, offices, restaurants, and other customers.

For foreign residents in Japan, switching to Octopus Energy for your electricity needs could be an opportunity to cut down on energy costs. However, because the company does not currently offer service in English, we have provided this article to help you decide whether Octopus Energy is the right energy company for you and, if you decide that it is, to guide you through the necessary steps for registration with the company and paying your bills (on time).

If you are interested in switching to Octopus Energy, your best option as always is to contact Selectra Japan (0120-164-006) for a free consultation in English so that we can help you get registered (registration with Octopus directly is only currently available in Japanese). Give us a call and we’ll help you save money on your electricity bills!

Advantages - Octopus Energy
  • Cheaper per unit rates can save you money on your electricity bills.
  • 100% renewable electricity.
  • No cancellation fees.
  • A company with a proven track record of reliability.
Disadvantages - Octopus Energy
  • No combined set plans available.
  • Not many different electricity rate plans to choose from.

Who can apply for service from Octopus Energy?

Octopus Energy currently supplies electricity throughout Japan, apart from Okinawa Prefecture and some of the more remote islands. Below is a comprehensive list.

TEPCO Tochigi, Gunma, Ibaraki, Saitama, Chiba, Tokyo (excluding the Tokyo Prefectural Islands), Kanagawa, Yamanashi, Shizuoka (east of Fujikawa)
CHUDEN Aichi, Mie, Gifu (excluding some regions), Mie (excluding some regions), Nagano
KEPCO Shiga, Kyoto, Osaka, Nara, Wakayama (excluding some regions), Hyogo (excluding some regions), Fukui (some regions), Gifu (some regions), Mie (some regions)
HEPCO Hokkaido
TOHOKUDEN Aomori, Iwate, Akita, Miyagi, Yamagata, Fukushima, Niigata
HOKUDEN Toyama, Ishikawa, Fukui (excluding some regions), Gifu (some regions
CEPCO Tottori, Shimane (excluding the Oki Islands), Okayama, Hiroshima, Yamaguchi (excluding Mishima Island), Hyogo (some regions), Kagawa (some regions), Ehime (some regions)
YONDEN Tokushima, Kochi, Kagawa (excluding some regions), Ehime (excluding some regions)
KYUDEN Fukuoka, Saga, Nagasaki, Oita, Kumamoto, Miyazaki, Kagoshima

Essentially anyone living in the areas listed above could apply to receive electricity from Octopus Energy. However, if you live in a “mansion” (apartment building) or similar building with multiple individual dwellings that receives electricity in bulk from a set provider, you will not be able to switch energy providers by yourself (the whole building will need to change).

You might be interested in signing up for Octopus Energy if...

  • You want to do your best to use environmentally-friendly energy
  • You want to save money on your monthly electricity bills
  • You like trying out something new
  • You want a power company with a proven track record of reliability

We especially recommend Octopus Energy to those who want to remain environmentally-conscious while saving money on their utility bills.

What kinds of electricity rate plans does Octopus Energy offer?

For average homes, Octopus Energy offers a rate plan called Green Octopus (read on for key details).

① Octopus's lower per unit rates provide better overall deals than major traditional electric power providers

The Green Octopus plan is generally aligned with the standard plans offered by the major electric power providers in terms of base rate charges.

Where the difference can be found is in the per unit (kWh) rate (i.e. based on your electricity meter reading), which Green Octopus sets at a lower price than the major providers.

What this means (because the base rate charges are the same but the per unit charges are lower with Green Octopus) is that Green Octopus will save you money* (unless you don’t use any electricity at all)!

*Note: when fuel prices experience a marked rise, Octopus Energy’s fuel adjustment fee may also rise and thus the overall charges could be higher than the metered rates of the major electricity providers. This means that the savings that Octopus Energy typically offers through lower per unit (kWh) rates may not always be available, so make sure to monitor fuel prices along with the unit price of the fuel adjustment fee.

It is also possible to use this Octopus Energy simulation (link below) to check how such trends can affect how much money you can save with a Green Octopus plan.

② 100% Committed to Renewable Energy

Green Octopus is a rate plan that is 100% committed to renewable electricity. 

The company is able to pursue this commitment to renewable energy by purchasing Non-Fossil Fuel Certificates based on the amount of electricity that you use with your plan, thus offsetting any CO2 emissions associated with the generation of this electric power.

While there are more and more companies out there on the market offering renewable electricity rate plans via Non-Fossil Fuel Certificates, many of these plans have unit prices higher than, or equivalent to, those of the major electricity providers.

Because Octopus Energy sells 100% renewable electricity at a lower price than the major providers, its Green Octopus rate plan kills two birds with one stone (catches two octopi with one net?), making it easier to save on your electricity bills while doing your best to be environmentally conscious.

Green Octopus - List of Rates*

Arranged by region (and major traditional regional provider). Click on your region below to reveal the drop-down lists of rates. All rates listed below include tax. Please note that while the base rate for Octopus Energy is set at a per day rate, we have adjusted this to a per month rate in the above tables to make easier comparisons with other providers.

Base Rate
Contracted Amperage (A) TEPCO Standard
Metered B Plan
Octopus Energy
Green Octopus Plan
10A ¥286.00 ¥286.00
15A ¥429.00 ¥429.00
20A ¥572.00 ¥572.00
30A ¥858.00 ¥858.00
40A ¥1144.00 ¥1144.00
50A ¥1430.00 ¥1430.00
60A ¥1716.00 ¥1716.00
Per Unit (kWh) Rate
TEPCO Standard
Metered B Plan
Octopus Energy
Green Octopus Plan
Up to 120kWh ¥19.88 ¥19.68
120-300kWh ¥26.48 ¥24.35
300kWh+ ¥30.57 ¥26.50
Base Rate
Contracted Amperage (A) CHUDEN Standard
Metered B Plan
Octopus Energy
Green Octopus Plan
10A ¥286.00 ¥286.00
15A ¥429.00 ¥429.00
20A ¥572.00 ¥572.00
30A ¥858.00 ¥858.00
40A ¥1144.00 ¥1144.00
50A ¥1430.00 ¥1430.00
60A ¥1716.00 ¥1716.00
Per Unit (kWh) Rate
CHUDEN Standard
Metered B Plan
Octopus Energy
Green Octopus Plan
Up to 120 kWh ¥21.04 ¥20.65
120-300 kWh ¥25.51 ¥24.50
300 kWh + ¥28.46 ¥26.30

For under 6 kVA of contracted amperage

Base Rate
KEPCO Standard
Metered A Plan
Octopus Energy
Green Octopus Plan
Up to your first 15kWh (fixed monthly rate) ¥341.01 ¥341.01
Per Unit (kWh) Rate
Power Consumption (kWh) KEPCO Standard
Metered A Plan
Octopus Energy
Green Octopus Plan
15-120kWh ¥20.31 ¥20.10
120-300kWh ¥25.71 ¥23.70
300kWh+ ¥28.70 ¥26.50
Base Rate
Contracted Amperage (A) HEPCO Standard
Metered B Plan
Octopus Energy
Green Octopus Plan
10A ¥341.00 ¥341.00
15A ¥511.50 ¥511.50
20A ¥682.00 ¥682.00
30A ¥1023.00 ¥1023.00
40A ¥1364.00 ¥1364.00
50A ¥1705.00 ¥1705.00
60A ¥2046.00 ¥2046.00
Per Unit (kWh) Rate
HEPCO Standard
Metered B Plan
Octopus Energy
Green Octopus Plan
Up to 120 kWh ¥23.97 ¥23.06
120-300 kWh ¥30.26 ¥28.30
300 kWh + ¥33.98 ¥30.70
Base Rate
Contracted Amperage (A) TOHOKUDEN Standard
Metered B Plan
Octopus Energy
Green Octopus Plan
10A ¥330.00 ¥330.00
15A ¥495.00 ¥495.00
20A ¥660.00 ¥660.00
30A ¥990.00 ¥990.00
40A ¥1320.00 ¥1320.00
50A ¥1650.00 ¥1650.00
60A ¥1980.00 ¥1980.00
Per Unit (kWh) Rate
TOHOKUDEN Standard
Metered B Plan
Octopus Energy
Green Octopus Plan
Up to 120 kWh ¥18.58 ¥18.15
120-300 kWh ¥25.33 ¥24.20
300 kWh + ¥29.28 ¥27.00
Base Rate
Contracted Amperage (A) HOKUDEN Standard
Metered B Plan
Octopus Energy
Green Octopus Plan
10A ¥242.00 ¥242.00
15A ¥363.00 ¥363.00
20A ¥484.00 ¥484.00
30A ¥726.00 ¥726.00
40A ¥968.00 ¥968.00
50A ¥1210.00 ¥1210.00
60A ¥1452.00 ¥1452.00
Per Unit (kWh) Rate
Contracted Amperage (A) HOKUDEN Standard
Metered B Plan
Octopus Energy
Green Octopus Plan
Up to 120kWh ¥17.84 ¥17.47
120-300 kWh ¥21.73 ¥20.70
300 kWh + ¥23.44 ¥21.45

For under 6 kVA of contracted amperage.

Base Rate
CEPCO Standard
Metered B Plan
Octopus Energy
Green Octopus Plan
Up to your first 15kWh (fixed monthly rate) ¥336.87 ¥336.87
Per Unit (kWh) Rate
Power Consumption (kWh) CEPCO Standard
Metered A Plan
Octopus Energy
Green Octopus Plan
15-120kWh ¥20.76 ¥20.38
120-300kWh ¥27.44 ¥26.26
300kWh+ ¥29.56 ¥27.25

For under 6 kVA of contracted amperage.

Base Rate
YONDEN Standard
Metered A Plan
Octopus Energy
Green Octopus Plan
Up to your first 15kWh (fixed monthly rate) ¥411.40 ¥411.40
Per Unit (kWh) Rate
Power Consumption (kWh) YONDEN Standard
Metered A Plan
Octopus Energy
Green Octopus Plan
15-120kWh ¥20.37 ¥20.16
120-300kWh ¥26.99 ¥25.65
300kWh+ ¥30.50 ¥27.65
Base Rate
Contracted Amperage (A) KYUDEN Standard
Metered B Plan
Octopus Energy
Green Octopus Plan
10A ¥297.00 ¥297.00
15A ¥445.50 ¥445.50
20A ¥594.00 ¥594.00
30A ¥891.00 ¥891.00
40A ¥1188.00 ¥1188.00
50A ¥1485.00 ¥1485.00
60A ¥1782.00 ¥1782.00
Per Unit (kWh) Rate
Contracted Amperage (A) KYUDEN Standard
Metered B Plan
Octopus Energy
Green Octopus Plan
Up to 120 kWh ¥17.46 ¥17.05
120-300 kWh ¥23.06 ¥22.05
300 kWh + ¥26.06 ¥23.75
Power Company TEPCO Octopus Energy
Plan Standard Metered Plan B Green Octopus
1 Person Household ¥5,362 ¥5,167
Save ¥195
2 Person Household ¥8,296 ¥7,888
Save ¥408
3-5 Person Household ¥13,167 ¥12,149
Save ¥1,018

Just a quick glance at this table shows that 1 person households in the Kanto region can look to save approximately ¥2,300/year on their electricity bills, while households with 3+ people can save approximately¥12,000/year.

Power Company CHUDEN Octopus Energy
Plan Standard Metered Plan B Green Octopus
1 Person Household ¥5,423 ¥5,296
Save ¥127
2 Person Household ¥8,260 ¥8,032
Save ¥228
3-5 Person Household ¥12,815 ¥12,263
Save ¥552

Just a quick glance at this table shows that 1 person households in the Chubu region can look to save approximately ¥1,500/year on their electricity bills, while households with 3+ people can save approximately ¥6,600/year.

Power Company KEPCO Octopus Energy
Plan Standard Metered Plan A Green Octopus
1 Person Household ¥4,530 ¥4,347
Save ¥183
2 Person Household ¥7,101 ¥6,717
Save ¥384
3-5 Person Household ¥11,406 ¥10,692
Save ¥714

Just a quick glance at this table shows that 1 person households in the Kansai region can look to save approximately ¥2,200/year on their electricity bills, while households with 3+ people can save approximately¥8,500/year.

Power Company HEPCO Octopus Energy
Plan Standard Metered Plan B Green Octopus
1 Person Household ¥6,320 ¥6,054
Save ¥266
2 Person Household ¥9,761 ¥9,273
Save ¥488
3-5 Person Household ¥15,199 ¥14,219
Save ¥980

Just a quick glance at this table shows that 1 person households in the Hokkaido region can look to save approximately ¥3,200/year on their electricity bills, while households with 3+ people can save approximately ¥11,800/year.

Power Company TOHOKUDEN Octopus Energy
Plan Standard Metered Plan B Green Octopus
1 Person Household ¥5,246 ¥5,104
Save ¥142
2 Person Household ¥8,109 ¥7,854
Save ¥255
3-5 Person Household ¥12,831 ¥12,234
Save ¥597

Just a quick glance at this table shows that 1 person households in the Tohoku region can look to save approximately ¥1,700/year on their electricity bills, while households with 3+ people can save approximately ¥7,160/year.

Power Company HOKUDEN Octopus Energy
Plan Standard Metered Plan B Green Octopus
1 Person Household ¥4,605 ¥4,478
Save ¥127
2 Person Household ¥7,020 ¥6,790
Save ¥230
3-5 Person Household ¥10,778 ¥10,249
Save ¥529

Just a quick glance at this table shows that 1 person households in the Hokuriku region can look to save approximately ¥1,500/year on their electricity bills, while households with 3+ people can save approximately ¥6,300/year.

CEPCO (Chugoku Region) vs Octopus Energy - Monthly Electricity Bill Comparison

Power Company CEPCO Octopus Energy
Plan Standard Metered Plan A Green Octopus
1 Person Household ¥4,711 ¥4,577
Save ¥134
2 Person Household ¥7,455 ¥7,203
Save ¥252
3-5 Person Household 11,889 11,291
Save ¥598

Just a quick glance at this table shows that 1 person households in the Chugoku region can look to save approximately ¥1,600/year on their electricity bills, while households with 3+ people can save approximately ¥7,170/year.

Power Company YONDEN Octopus Energy
Plan Standard Metered Plan A Green Octopus
1 Person Household ¥4,790 ¥4,660
Save ¥130
2 Person Household ¥7,489 ¥7,225
Save ¥264
3-5 Person Household ¥12,064 ¥11,373
Save ¥598

Just a quick glance at this table shows that 1 person households in the Shikoku region can look to save approximately ¥1,600/year on their electricity bills, while households with 3+ people can save approximately ¥8,300/year .

Power Company KYUDEN Octopus Energy
Plan Standard Metered Plan B Green Octopus
1 Person Household ¥4,831 ¥4,701
Save ¥130
2 Person Household ¥7,434 ¥7,203
Save ¥231
3-5 Person Household ¥11,640 ¥11,062
Save ¥578

Just a quick glance at this table shows that 1 person households in the Kyushu region can look to save approximately ¥1,560/year on their electricity bills, while households with 3+ people can save approximately¥6,930/year.