The huge debts were detailed in an administrator’s report on Clugston Group filed at Companies House by KPMG this week.
The report said unsecured creditors are expected to receive some money for their unpaid bills but “the quantum and timing is unknown.”
Clugston collapsed in December as construction work on 21 sites across the country was stopped.
The report blames the contractor’s demise on problem Energy from Waste contracts and an “acute cash flow issue.”
The report added: “The position was further exacerbated following the failure of a key subcontractor in June 2019 which resulted in significant ransom positions from the supply chain.”