Don't be silly, TRTC is a small company in an federally illegal business and a profitless industry.
There are no lower borrowing costs for these companies.
TRTC is using idle money from the sale of assets to buy back shares. around 40% of their shares could be brought back with 20 Million dollars. They did not borrow it.
The buy back will be on the open market which should drop the OS considerably & increase the value considerably.