OCCTO has started to publish electricity demand data and graphs

By 2018-12-12June 26th, 2019Commentary, News
Based on the supply data for October 2018, the Organization for Cross-regional Coordination of Transmission Operators, Japan (OCCTO) has started publishing “Electricity Supply Data and Graphs for the 10 area*” and “area-specific graph” each month. Let’s see the difference with ISEP Energy Chart through the visualization of data and graph.
* 10 area refers to the divided grid of Japan, for example, Hokkaido, Kyushu, etc.
The above graph is an example of the graph of supply performance from October 1 (Monday) to October 7 (Sunday) of 10 area in total by OCCTO. In addition, demand performance, power generation and curtailment of solar power and wind power are shown every week. Also, the numerical data of 10 area can be compiled and downloaded by OCCTO. For details, please refer to OCCTO website “About publication of supply results” [1](in Japanese).

[1] The “Grid Information Service” on which the published data is posted may not be compatible with display depending on the web browser.

Based on the results of the 11th and 12th deliberations of the Electricity and Gas Basic Policy Subcommittee, METI, it will be published on the OCCTO website on a monthly basis as the quarterly publication of power supply data were available. For more details, please refer to the outline summary of the same committee and relevant materials.

As stated in “Concept” of ISEP Energy Chart, it is inspired by European countries where the prevalence of renewable energy has progressed, data on energy is disclosed in a timely manner, and based on published data, government agencies and independent research institutions and others have visualized them and used them for research and policy recommendations.

The fact that information provided by OCCTO began this time means that this movement will accelerate in Japan. In addition, as for the visualization of data, each approach can be expected to mutually enhance sound competition, so that it will be possible for users to provide easy-to-understand information.

Below, let’s look at the difference between OCCTO’s published data and ISEP Energy Chart’s main features on electricity supply and demand information.


Publication time
  • OCCTO is announced at the beginning of the next month (each general transmission and distribution company announces at the end of the next month)
  • ISEP Energy Chart will publish in the middle of the next month (We plan to update the system for speeding up in the future)
Publication information
  • OCCTO provides numerical data and graphs of 10 area in total, and graphs for each area (numerical data of each area is publicized by general transmission and distribution business operators)
  • ISEP Energy Chart can use numerical data and graphs for each area and 10 areas in total
Graph details
  • OCCTO publishes results of supply every week, demand, etc., photovoltaic power generation and curtailment performance, wind power generation and curtailment performance in PDF
  • ISEP Energy Chart publishes supply and demand results in an interactive graph. Displayable from 1 day to 12 months from any date. By clicking on the legend, you can select any power generation source and display it, so you can also display solar power generation and curtailment results. Switching between stacking method and residual demand method can be selected.
Other information provision (electricity supply and demand related)
  • OCCTO displays real-time power usage and lineage related
  • ISEP Energy Chart is equipped with the maximum and minimum search functions by displaying share by power configuration and searching.


ISEP Energy Chart will continue to improve its functions and visualize new data.