There's a lot to unpack here so I'll try to go through it point by point.
"The same players, some using a different name were involved in that discussion.
check the forum about this issue."
Yes, I am one of those players that brings up wind and its effects and errors to you relatively often, and for good reason. Yes, I used to have a different name on the forum. Until you took down a post that I had made that you said threatened you and you imposed a ban - ignoring the multiple players that then came out having read the post before it was removed backing the claim that there were no threats and ignored calls to put the post back up so others could decide themselves. Being on the discord I still knew of some things going on with the forum after I was removed. I had to wait for my account to expire to re-register for the game completely to be back on here.
At the same time I'm the player that has always had the health of the game in mind which is why the things that I bring up here are virtually all error fixes and status updates. My main issue that I have tried to convey is the vagueness of details that you provide in updates if any information is provided at all, in a game that is virtually completely about number crunching. That is a reasonable issue to have with a game developer. I brought up the issue of how your updates are posted, namely I recall having a back and forth with you over your 'Game News' page, which for most players, especially new players, would be the first stop to see the game's changes over time. At the time you forum banned me it hadn't been updated in roughly a year, which to new players especially, which are critical to the game's long term health, made it appear that the game hadn't been updated for almost a year. Updates posted on the forum, when they're posted, are often challenging at best to locate. The forum search feature is clunky on its best day. I have noticed that the Game News has again not been updated essentially since the ban, now approaching the end of its 7th month without an update posted. That is a problem. I'm also the player that uses publicly available information to try to help hunt down cheating players in game and present them to you, and goes out of my way to try to identify how exploits are occurring and then share the step by step process with you when I successfully identify one.
And finally the wind that keeps getting brought up. Unfortunately it keeps getting brought up because it is unfortunately clear that even direct complete information presented to you along with all of the data available to you as the GM, you haven't had an accurate grasp on how wind power works in your game. That isn't meant as a personal insult, just a reasoning for why these same issues keep getting presented and why your changes performed and projected seem to miss the mark.
"the quality now is 170 instead of 120.
It will be reduced to 150 within a week and then, in the coming weeks to 120 as intended from the start."
As intended from the start really doesn't hold weight. The most recent discussion regarding wind less than a month ago had some input from you worth going over again:
"The quality of electric power delivered by the wind farms is not taken into account.
It was discussed in the past.
quality is not always taken into account and this is the case with electric power produced by wind farms.
The cost of maintenance of wind farms has several factors. One wind turbine is used each month but also some other materials.
the computation of the cost of wind farms is done correctly.
It is checked and rechecked many times and it is correct.
wind farms remain veery profitable.
We in fact think that the profitability is too high and unrealistic.
we do not have any current plans to correct it."
In the most recent discussion less than a month ago, you confirmed that profitability was too high, something nobody has ever disagreed with, and in the same post said you did not have any current plans to correct it. Then in one unannounced maintenance dropped the financial output by upwards of 50% while dramatically increasing required micromanagement. Despite multiple attempts at explaining exactly how the wind system was working since its release you seem to think the actual income and expenses were far different even with all of the information in front of you.
Players that have invested heavily into wind from day one have seen enormous gains, that is not in dispute. Players have tried to convey to you how massive the gains were for consideration to bring their potential more in line with other products. But there has seemed to always be a disconnect between how the mechanics of wind worked in the game and how you thought the mechanics of wind worked.
Your statement yesterday showed a fundamental lack of understanding the mechanics.
"The EP quality in Wind Farms should be Q120 as we have explained months ago.
We do not take the quality of Windfarms into account because it will increase profits in a way that will force us to increase maintenance cost and use 2 or 3 wind turbines for maintenance each month."
As had been explained a multitude of times, wind production quality not being taken into account is EXACTLY WHY profits were what they were. Making WF or WT quality matter would do the exact opposite of what you claim for anybody with a basic understanding of the mechanics of your wind power system. Your claim that taking quality into account would mean having to increase maintenance costs, proposing to double or even triple WT consumption - which from your recent posts looks like you intend to do even with this sudden arbitrary reduction to 170 and then 120 quality, is absolutely absurd.
A key principle in your interaction with other players seems to be this idea that because you are the GM you know every detail of how the game performs and are quick to dismiss your players experiences and provided data, trying to shift conversation to something else. For the sake of the game, you need to open your mind and understand that information provided shouldn't be so instantly disregarded just because it didn't come from your own personal experience.