1km Mesh Power Outage Risk Forecast

GET

/api/v1/pwfl

Get power outage risk forecasts for specified latitude and longitude coordinates, calculated with 1km grid resolution. The specified latitude and longitude must be within Japan. There are also data available over the sea, but they are not related to power outages, so please refrain from using them.
The power outage risk forecast includes hourly information for approximately 3 days.

Power Outage Risk Codes

Code	Description
1	No power outage risk
2	Possible power outage
3	Power outage caution
4	Power outage alert

---

Forecast Update Times

• 2:50 AM
• 5:30 AM
• 11:30 AM
• 3:30 PM
• 10:30 PM

Note: Manual updates may occur during severe weather conditions.

Parameters

Query Parameters

lat*

Latitude

Typenumber

Required

Example35.651377

formatfloat

lon*

Longitude

Typenumber

Required

Example140.041161

formatfloat

Responses

1km grid-based power outage risk forecast data

Content-Type

application/json

{

"requestId": "3909775c-5d0f-4e96-8e4f-7d3f263e2056",

"wxdata": [

{

"lat": 35.651377,

"lon": 140.041161,

"data": [

{

"date": "2025-04-09T10:00:00+09:00",

"pwflidx": 0

}

]

}

]

}

GET

/api/v1/pwfl

Playground

Authorization

X-API-Key

Variables

Key

Value

lat*

lon*

Samples

cURL

JavaScript

PHP

Python