# Brownout — Japan Power Forecast Viewer

> Japan electricity demand forecast viewer for 10 regions. (iPhone/iPad app by Bitz.)

- Source: https://appshunter.io/ios/app/brownout/id443661505 (this page in markdown: same URL + `.md`)
- Developer: [Bitz](https://appshunter.io/developer/434213281)
- Category: Utilities, Lifestyle
- Price: Free
- Age rating: 4+
- Requires: iOS 26.0 · 1 MB
- Languages: American English, Japanese
- Released: 2011-06-17
- Data updated: 2026-08-16
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/brownout/id443661505/reviews.md

## What is Brownout?

"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.

## Key features

- Electricity demand forecasts for 10 Japanese regions
- Actual demand, forecast, and supply capacity charts
- Real-time usage rate display
- Easy region switching
- Data from regional power companies

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/brownout/id443661505/reviews.md

### 3/5 — グラフ表示画面で

*2011-06-29*

グラフ表示画面で縦横にマス目があると見やすいですね。
また、現在の使用率を○○％とどこかに表示してあると見やすい。
縦軸の電力単位は、ｋW表示の方が一般的とおもいます。

## Frequently asked questions about Brownout

### What is Brownout?

Brownout is a free iOS app that displays electricity demand forecasts for 10 regions across Japan. It shows actual demand, forecast, and supply capacity in easy-to-read line charts.

### Does Brownout have ads?

No, Brownout is ad-free. Users can check electricity demand forecasts without any advertisements interrupting their experience.

### What regions does Brownout cover?

Brownout covers all 10 major regions of Japan: Hokkaido, Tohoku, Tokyo, Chubu, Hokuriku, Kansai, Chugoku, Shikoku, Kyushu, and Okinawa.

### How often is the data updated in Brownout?

The app fetches data from CSV files published by regional power companies. While the app itself was last updated on July 6, 2026, the frequency of the underlying data updates depends on the power companies.

### What devices is Brownout compatible with?

Brownout is available for iPhone and iPad, making it accessible to a wide range of Apple users.

### What is the age rating for Brownout?

Brownout has an age rating of 4+, indicating it is suitable for most users and does not contain mature content.

### Where does Brownout get its data?

The app sources its electricity demand forecast data from the Denki Yoho CSV files published by each regional power company in Japan.

### Is Brownout available on Android?

Based on the provided data, Brownout is an iOS application and is not available on Android devices.

## Version history (last 5 releases)

### 2.0.1 — 2026-07-06

Fixed an issue where power demand data could not be retrieved for some regions.

### 2.0 — 2026-06-18

Now covers all 10 regional power areas across Japan — Hokkaido, Tohoku, Tokyo, Chubu, Hokuriku, Kansai, Chugoku, Shikoku, Kyushu, and Okinawa. Also updated for iOS 26.

### 1.0.3 — 2011-09-23

Added support for post Tweet.

### 1.0.2 — 2011-07-14

New data formats for TEPCO.

### 1.0.1 — 2011-06-30

Added a search function of the hashtag of blackout of the Twitter.

## More apps by Bitz

- [Bitz SplitCheck](https://appshunter.io/ios/app/bitz-splitcheck/id6760656184)
- [Bitz KeepADiary](https://appshunter.io/ios/app/bitz-keepadiary/id6766049283)
- [Bitz Backgammon](https://appshunter.io/ios/app/bitz-backgammon/id6782510943)

All apps by Bitz: https://appshunter.io/developer/434213281

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-16.*