[Original Report Vol. 44] 88.3% of Solar Sales Representatives Have Been Asked by Customers About the 'Basis for Setting Electricity Rate Increase Rates'; Approximately 90% Hope for Industry Standardization

Kokusai Kogyo Co., Ltd. (Headquarters: Shinjuku-ku, Tokyo; President: Kyo Fujiwara), which provides the solar and storage battery economic effect diagnosis service "Enegaeru" (https://www.enegaeru.com/), conducted a survey targeting 111 sales representatives and management involved in the sales and proposal of solar panels and storage batteries, regarding the actual situation of setting electricity rate increase rates in economic effect simulations. We are pleased to announce the results.

*The survey results can be used by adhering to the conditions described below.

01｜88.3% of sales representatives involved in the sale and proposal of solar power and storage batteries have experienced customers questioning or confirming the premise setting of electricity rate increase rates.

02｜89.2% responded that industry-wide standardization is necessary.

03｜The most common simulation setting for electricity rate increase rates is "3% per year," accounting for 23.4%.

Download this survey here.

■Survey Overview

Survey Name: Survey on the Actual Situation of Setting Electricity Rate Increase Rates in Solar and Storage Battery Economic Effect Simulations

Survey Method: Internet survey planned by "Risapii®︎," a research marketing service provided by IDEATECH.

Survey Period: April 13, 2026, to April 14, 2026.

Valid Responses: 111 sales representatives and management from companies involved in the sales and proposal of solar panels and storage batteries.

*Percentages are rounded to the first decimal place, so the total may not always be 100.

≪Conditions for Using Survey Results≫

1. Please clearly state "Survey by Enegaeru Management Office" as the source of information.

2. When used on a website, please include the following link as the source:

URL: https://www.enegaeru.com/

■"3%" is the most common annual electricity rate increase rate set by sales representatives, accounting for 23.4%; 74.7% set 3% or more.

When asked "Q1. Please tell us the annual electricity rate increase rate you mainly set in economic effect simulations." (n=111), "3%" was the response for 23.4%, and "5%" for 20.7%.

Q1. Please tell us the annual electricity rate increase rate you mainly set in economic effect simulations.

・0% (calculated with no increase): 1.8%

・1%: 5.4%

・2%: 9.0%

・3%: 23.4%

・4%: 17.1%

・5%: 20.7%

・6% or more: 13.5%

・Varies by project/customer: 5.4%

・Don't know/Cannot answer: 3.6%

■77.5% of sales representatives have internal standard values or recommended values for electricity rate increase rates; "approximate standards exist" for 52.3%.

When asked "Q2. Does your company have internal standard or recommended values for electricity rate increase rates?" (n=111), "Clearly defined" was the response for 25.2%, and "Approximate standards exist" for 52.3%.

Q2. Does your company have internal standard or recommended values for electricity rate increase rates?

・Clearly defined: 25.2%

・Approximate standards exist: 52.3%

・Judged on a case-by-case basis: 16.2%

・Not specifically defined: 5.4%

・Don't know/Cannot answer: 0.9%

■91.9% of sales representatives explain the electricity rate increase rate to customers; only 36.0% explain it in "all projects."

When asked "Q3. Do you explain the electricity rate increase rate set in simulations to customers?" (n=111), "Explained in all projects" was the response for 36.0%, and "Explained in some projects" for 55.9%.

Q3. Do you explain the electricity rate increase rate set in simulations to customers?

・Explained in all projects: 36.0%

・Explained in some projects: 55.9%

・Generally not explained: 6.3%

・Don't know/Cannot answer: 1.8%

■Only 36.3% of sales representatives explain the basis in "all projects." Variation by project is significant.

When asked "Q4. For those who answered 'Explained in all projects' or 'Explained in some projects' in Q3: Do you explain the basis for setting that electricity rate increase rate to customers?" (n=102), "Explained in all projects" was the response for 36.3%, and "Explained in some projects" for 60.8%.

Q4. For those who answered 'Explained in all projects' or 'Explained in some projects' in Q3: Do you explain the basis for setting that electricity rate increase rate to customers?

・Explained in all projects: 36.3%

・Explained in some projects: 60.8%

・Rarely explain the basis.