For those who are new here in Kanto/Tokyo area , you might have heard the word "setsuden/ 節電". Below is a link from TEPCO about up to date energy demand and production in English. So if you notice that lights etc. are turned off, and air conditioning is set at 28c you are not mistaken.
Not unlike the aftermath of 2011, the brand stores will continue to use full power and air conditioning while having their doors wide open. Try not to follow their example !

https://www.tepco.co.jp/en/forecast/html/index-e.html