How to reduce electricity bills for apartment complexes and stores

I don't usually watch the news on TV, but they're doing a special feature that interests me.
I record it and watch only the part I want to watch. Recently, I've been watching World Business Satellite.
They often have special features on energy, so I watched yesterday's episode this morning.
I didn't know this until yesterday, but even in Japan today, there are PPSs (power producers and suppliers).
By using this system, you can buy electricity from companies other than TEPCO and KEPCO.
However, this is not possible at the individual level, and the target is special high voltage and
This is for those who receive high voltage electricity (6000V or more).
There seem to be many PPS companies, but the largest is Ennet, which has a 50% market share.
It seems.http://www.ennet.co.jp/index.html
The company is being invested in by NTT Facilities, Osaka Gas, and Tokyo Gas, so it is a company that competes with electric power companies.
It can be surmised that this was the intention behind the design.
Companies that switched from Tokyo Electric Power Company to Ennet saw their electricity bills drop by 27%.
So, it seems that there are a lot of inquiries, but even though there are a lot of applications, it is currently difficult to accept new contracts.
It is said that.
Another company that was introduced was Chuo Electric Power.
This company acts as an intermediary between major local electric power companies and condominiums, etc.
Normally, if you contract directly with an electric power company for low voltage, the fee structure will be high, but
This company will enter into a contract for low-cost high-voltage electricity, and then supply it to the apartment building at low pressure.
It's a system that will reduce electricity bills.
http://www.denryoku.co.jp/
By the way, in a certain apartment building that uses Chuo Electric Power, electricity bills have decreased by 25%.
There seems to be a similar company called Nippon Electric Power Co.,http://www.jepsx.jp/
The design firm where I previously worked had been using this type of power company for the past four or five years.
As expected, since my specialty is detached houses, information seems to be slow when it comes to other fields.
As I was watching the program, towards the end, a real estate company that had used this system appeared.
I was surprised to see that it was Mr. H, a member of Passive House Japan!
As expected, the circle of people working on energy conservation in the construction industry is small.