The progress, or lack of progress, isn't actually the driving factor affecting pps.
It's the simple fact that the company is structured in a way that makes it damn near impossible for common stockholders to benefit from a long term investment.
Look into the history of how TRTC was formed and it becomes obvious that this stock is nothing more than the pennystock pump & dump every investment professional has ever warned folks about. The only sources of denial with respect to this are the investors who are trapped with huge losses. This is obvious on its face, but it's also easily verifiable. Look into it.