Brownout
Japan Power Forecast Viewer
Free · Designed for iPad. Not verified for macOS.
A simple power forecast app covering all 10 regions of Japan. View actual demand, forecast, and supply capacity at a glance — plus real-time usage rate.
"Brownout" is an iOS app that lets you easily check the electricity demand forecast (Denki Yoho) for 10 regions across Japan.
View each region's actual demand, forecast, and supply capacity as a daily line chart. Simply switch between regions to instantly check the power situation anywhere from Hokkaido to Okinawa.
[Features]
• Displays electricity demand forecasts for all 10 regions of Japan
• View actual demand, forecast, and supply capacity in easy-to-read line charts
• Shows real-time usage rate
• Region switching
[Supported Regions]
Hokkaido / Tohoku / Tokyo / Chubu / Hokuriku / Kansai / Chugoku / Shikoku / Kyushu / Okinawa
Data is fetched from the Denki Yoho CSV files published by each regional power company.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Fixed an issue where power demand data could not be retrieved for some regions.
The developer, Bitz, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Bitz Co., Ltd.
- Size
- 1.4 MB
- Category
- Utilities
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- Copyright
- © 2011-2026 Bitz Co., Ltd.