Although I am personally still not 100% convinced that Free Energy actually can be realized, there is quite some evidence that it is possible and we have already created some of these devices.

But if this is true then:
– Why are so many scientists of fame claiming that it can not be done.
– Why are we (the people) unaware of it?

Well, first of all, main stream science is still based on Newtonian science which only describes the physical world Their worldview is based on Materialism
Within quantum physics the scope widens up and includes the  metaphysical world as well. Their worldview is based on Holism.
The concept of Free Energy is part of quantum physics which explains why so many main stream scientists are simply unaware of this field of knowledge.

Secondly, If Free Energy would be released to the people, those who rule over the people would lose an immense part of their power.
Trillion dollar industries on fossil fuels, renewable energy and even the Climate Change industry would fall to pieces.
And they do not want that and will do anything to prevent that from happening.
There is even a US law (The Invention Secrecy Act of 1951) that will confiscate and suppress any technology that will impact their power negatively.

This 2024 documentary by Steven Greer zooms in to this topic.
|He even goes a little further where he claims that the US military is already making use of this technology for decades and this is what we see when we encounter UFO’s
They are man-made Free Energy Devices that also make use on anti-gravity technology.