Your electricity bill,
How much cheaper will it be?

Just by changing your power company, your electricity bill changes.

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Place of residenceNumber of household membersPlease enter

ZIP code
Number of household members

Average annual electricity bill

electric power company

Subscription plan

amperage

40A

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  • octopus energy
  • CDエナジー
  • TERASELでんき
  • HTB ENERGY
  • idemitusでんき
  • ミツウロコでんき
  • TOKYO GAS
  • ENEOSでんき

To review electricity bills
Selected plan

Check not only the fees, but also the benefits, cancellation fees, and conditions.

Simple Octopus

TG Octopus Energy
Corporation

Simple design with a 0 yen base fee.
Pay as you go,
Clear and easy-to-start electricity plans.

View details

Basic plan

Tokyo Gas Co., Ltd.

Save more when bundled with gas.
With a reliable, classic plan,
Safe even for first-time electricity switching.

View details

Basic Denki B

CD Energy Direct

The standard plan for an average household.
From singles to families
A well-balanced pricing plan.

View details

V Plan

ENEOS Power Co., Ltd.

Save money with cars and point linkage.
Combined with daily life services
A plan with expanding benefits.

View details

S Plan

Idemitsu Kosan Co., Ltd.
Idemitsu Denki

Simple pay-as-you-go pricing for peace of mind.
Unique to a major energy company
A trusted plan.

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Major electric company plans
Compare all together

Summary and Check of Major Electric Power Companies' Characteristics

Octopus Energy Tokyo Electric Power Company
Energy Partner
HTB Energy CD Energy
Direct
Service area Nationwide (Okinawa and remote islands excluded
Except)
compatible with
Nationwide (Okinawa and remote islands excluded
Except)
compatible with
Nationwide (Okinawa and remote islands excluded
Except)
compatible with
Centered around the Kanto region
Unavailable in other regions
cancellation fee No cancellation fee Premium S/L,
With the premium plan
Cancellation fee applies
If canceled within one year
Subject to penalty fee
* No cancellation fee in case of relocation
No cancellation fee
* "Single Denki", "Basic Denki"
Family Denki, Point Denki
While "Smart Denki" and "CD Green Denki" do not incur any cancellation fees at all,
Some electricity plans incur cancellation fees.
Renewable energy compatibility Simple Octopus
around April 2026 or later
effectively renewable energy
Compatible with 100%
With the Aqua Energy 100%
renewable energy
Compatible with 100%
*From January 11, 2023
New applications temporarily suspended
With the LOVE Earth Plan
effectively renewable energy
Compatible with 100%
With CD Green Denki
effectively renewable energy
Compatible with 100%
To the official site To the official page To the official page To the official site
View notes, evaluation criteria, and sources
Service areaCovering all 10 areas of former general power transmission and distribution utilities / Same 9 area / Same 8 areas or less
cancellation feeNo cancellation fee for all low-voltage plans / Low-voltage partial plan with cancellation fee / Cancellation fee applies to all low-voltage plans.
Renewable energy compatibilityAll low-voltage tariffs feature renewable energy or effectively renewable energy / Low-voltage renewable energy or virtually 100% renewable energy tariffs are available / Low-voltage renewable energy, or no 100% renewable energy plan available
Source and reference information *Created based on information posted on each company's official website (as of April 2026). Since pricing plans, campaigns, and contract conditions are subject to change, please be sure to check the latest information on each company's official website before signing a contract.

- Octopus Energy Official
・TEPCO Energy Partner Official
HTB Energy Official
- CD Energy Direct Official

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Featured by the editorial department
Introduce an electric power company

Summary of Major Electric Power Companies' Characteristics

Octopus Energy

Recommended for people like this!
  • I want to choose the best plan based on how I use electricity.
  • I want to make the contract terms flexible.
  • I want to choose eco-friendly electricity.

Octopus EnergyThe pricing structure is simple and easy to understand.We are an electric utility. With Simple Octopus 2026-04, we supply electricity that is effectively 100% renewable energy.Simple plan with 0 yen base fee and no fuel cost adjustmentand it is a major feature that you can choose according to how you use electricity.
On the other handPay-as-you-go plan targeting the lowest pricesand other options are also available, making it easy to find a plan that suits you from among multiple pricing structures, which is another attractive feature.
With no cancellation fees or contract term commitments,It flexibly adapts to changes in lifestyle. With a good balance of rates, conditions, and environment, it is also chosen by those reviewing their electricity provider for the first time.

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Tokyo Electric Power Company Energy Partner

Recommended for people like this!
  • I want to choose a long-term, stable power supply.
  • I want to choose from a variety of pricing plans that fit my lifestyle.
  • I want to place importance on reliability and the support system.

TEPCO Energy Partner (TEPCO EP) is a major electric power company widely used primarily in the Kanto region, offering multiple rate plans tailored to various lifestyles and household usage patterns. A major feature is its diverse pricing structure, which includes plans tailored to different lifestyles, such as plans offering discounted rates at night or during specific time slots for all-electric homes, in addition to conventional standard plans. The pricing mechanism is clear, making it relatively easy to choose even for those reviewing their electricity provider for the first time. In addition, it is valued for its high reliability, offering ancillary services such as combined electricity and gas discounts and loyalty point programs.

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CD Energy Direct

Recommended for people like this!
  • I want to save money on both electricity and gas together.
  • High usage in family households
  • I want to compare multiple plans and choose one.

CD Energy Direct is a combined electricity and gas contract.This electric power company's major strength is its support for . Because utility costs can be managed together, it is favored by those looking to review their household budget. With a wide range of plan options, it offers pricing structures suited for everyone from single-person households to families. It features a well-balanced design between basic and usage rates, making it easy to experience savings based on consumption. Furthermore, with online application discounts and campaigns, it is chosen by people seeking comprehensive benefits beyond just pricing. Another appealing aspect is the peace of mind and stability provided by being operated by a major energy corporate group.
*Limited to cases where the electricity and gas supply contracts for the applicable plan are concluded under the same name at the demand location for the applicable plan, and the charges for the applicable electricity and gas plans are paid using the same payment method.
*The gas set discount applies to the basic fee and electricity volume charges (excluding the fuel cost adjustment). However, the gas set discount does not apply to Smart Denki. The electricity set discount does not apply to Yukapoka Gas and Hatsuden Gas.

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ENEOS Denki

Recommended for people like this!
  • I want to prioritize the peace of mind that comes with a major corporation.
  • I want to save money on gasoline and my car life overall.
  • I want to choose a stable service with a standard pricing structure.

ENEOS Electricity is an electric power service whose strengths are a stable supply system and a sense of reliability backed by a major energy company. Its pricing structure is based on a standard metered-rate system, with the distinctive feature of linking benefits with gas stations and car life-related services. It is designed to be used advantageously in combination with everyday lifestyle services. It features a support system and service network unique to a major brand, making it suitable for those who prioritize peace of mind. It can be said to be an option for people who want to consider benefits across their entire lifestyle, not just electricity rates.

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Electricity company that won't fail
Selection Guide

From pricing and contract terms to compatibility with your lifestyle,
Easy-to-understand explanation of key points to avoid regret.

To the selection guide list

Find an electricity company that suits you in 30 seconds

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Application process for an electricity company

Process from Application to Start of Use

STEP 01

Enter electricity usage

You enter your current power company and your monthly electricity bill.
Based on the information provided, we will estimate your annual electricity consumption and calculate the optimal plan.

STEP 02

Compare and check plans

You can compare estimated electricity bills and savings based on the simulation results.
Please check not only the rates, but also the contract terms, power source composition, and the features of each plan.

STEP 03

Apply for the plan you are interested in

Please check the details, and if you find an electric company you are interested in, you can apply directly.
If you are switching, having your supply point identification number or your previous electricity company customer number ready will make the process smoother.

STEP 04

Start of electricity service

After the switching procedure is completed, the new electricity company's service will start from the meter-reading date onwards.
As a general rule, construction work and attendance are not required.

When switching power companies
Frequently Asked Questions

Questions about contracts, fees, and procedures
You can check them all together.

Q.Does switching electric power companies make blackouts more likely?

A.No, it won't make power outages more likely.
Power transmission and distribution facilities are managed by regional electric power companies as before, so the quality and stability of electricity do not change even if you switch power companies.

Q.Are construction work or home visits required to switch power companies?

A.As a general rule, construction work and attendance are not required.
If the same type of power meter (smart meter) as the current one is already installed, the process is completed simply through remote switching procedures. Unless there are special equipment changes, there will be no power outages or on-site visits.

Q.Do I need to contact my current electricity provider to cancel my contract?

A.Basically, no cancellation notice is required.
When you apply for a new electricity company, the cancellation process with your current electricity company will be done automatically.
*However, please check in advance if your contract plan involves cancellation fees.

Q.Will the electricity bill really go down?

A.Depending on your household's usage and contract plan, choosing a plan that fits your usage situation may lead to savings.
Particularly households with high electricity consumption and those who can take advantage of time-of-use pricing tend to see more benefits.
I recommend comparing them with reference to the simulation results.

Q.Does the electricity company switch immediately after signing the contract?

A.Switching will, as a rule, take place from the next meter-reading date onward.
Therefore, it does not switch immediately after application, but the supply from the new power company usually starts within a month as a guide.

Find an electricity company that suits you in 30 seconds

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Just by choosing, your electricity bill changes.
Electricity that fits your lifestyle.