Fig. 1: Daily volume-weighted spot electricity price from 1 January 2016 to 31 December 2020.
From: The impacts of carbon pricing on the electricity market in Japan

From the top left to the bottom right are variations of the electricity price for regions of Kansai, Chugoku, Chubu, Hokkaido, Shikoku, Tohoku, Kyushu, Tokyo, and Hokuriku.