The administrators of failed engineering firm RCR Tomlinson have revealed the company has debts totalling hundreds of millions of dollars, including up to $250 million owed to about 4,000 subcontractors and suppliers.

Key points: The engineering firm ran into trouble after an aggressive move into solar

The engineering firm ran into trouble after an aggressive move into solar A total of $630 million is owed to creditors, subcontractors and suppliers

A total of $630 million is owed to creditors, subcontractors and suppliers The collapse came after a $100m injection of funds just three months ago

Administrators McGrathNicol revealed to creditors across the country that RCR's total unpaid debts amounted to up to $630 million, but it could not say how much was recoverable until it started to sell off parts of the business.

The company, which employed 2,800 people directly and engaged with thousands of subcontracting firms across dozens of projects around the country, went into administration last month after its bank refused to lend it more money to pay its debts.

At its peak in August last year, RCR Tomlinson was valued at almost $1 billion.

Since McGrathNicol was appointed, the company's workforce has reduced by 270, with most of the redundancies coming from the infrastructure arm, which includes its solar contracts.

Employee entitlements excluding redundancy total $32 million. Under the Corporations Act, employees are paid first, followed by secured creditors, unsecured creditors and shareholders.

RCR creditors — who is owed what Trade creditors (subcontractors and suppliers) — $100-250 million

Trade creditors (subcontractors and suppliers) — $100-250 million Secured creditors — $235 million

Secured creditors — $235 million Unsecured bond issuers — $113 million

Unsecured bond issuers — $113 million 2,800 employee entitlements totalling $32 million, excluding redundancy

Burned by solar

McGrathNicol partner Jason Preston told creditors initial investigations revealed the company's collapse was largely caused by problems with its solar farm developments, which left the business exposed to a number of risks, particularly if there were project delays.

This was attributed to the way in which the contracts were structured.

RCR signed engineering procurement and construction contracts, or EPCs, for its solar projects, in which it provided a fixed price for its customers.

If the contract took longer to complete, and therefore cost more to deliver, RCR had to absorb the increase.

RCR Tomlinson's work on two solar farms in Queensland were hit with a $57m writedown. ( Supplied: RCR Tomlinson )

This meant the company consumed "significant amounts of cash very quickly," McGrathNicol told creditors.

The administrators indicated they were likely to apply to push the next creditor's meeting back by three months due to the complex nature of the business, adding the RCR group was made up for 41 companies spanning a number of sectors including, energy, mining, resources, water and renewables.

The company had been a successful engineering firm for 120 years — predominantly in the mining and resources industry — before making its aggressive move into the solar industry.

RCR ran at the solar power movement hard and has been involved in building farms across the country, but it was a $57 million write-down on the value of two of its Queensland projects that burned it.

At the first meeting creditors, held across four states, McGrathNicol told suppliers, contractors and employees it was working to sell the business but could not quantify how much it would raise in the sale.

McGrathNicol last week managed to secure funding to support ongoing trading of the company and said it hoped to find a buyer or buyers by the end of the year, having received interest from more than 180 parties.

"Our priority is to prepare the business for sale to bring certainty to employees, customers and suppliers," McGrathNicol partner Jason Preston said.

"The business has been challenged by unprofitable solar contracts within its renewable operations, however the balance of the business operates across industries which are seeing increasing demand for services."

Among the solar projects left in limbo include the expansion of Synergy's Greenough solar farm in Western Australia's Midwest.

RCR Tomlinson was working on the expansion of the Greenough River Solar Farm in WA's Midwest. ( ABC News: Sarah Tallier )

The energy utility has terminated its contract with RCR and has started the process of finding a new contractor.

Site activities will remain suspended during the replacement process.

Subcontractors gravely concerned

The company owes between $100 million and $250 million to 4,000 trade creditors across the country, which includes subcontractors and suppliers.

Dozens of creditors queued up to find out how much money they could expect to get back following the collapse. ( ABC News: Glyn Jones )

Mike Hollier runs a metal fabrication business which was working for RCR's power division.

"I'm owed $42,000, part of that is made up of $27,000 of gear that they have and the rest sitting in the yard, which is about $13,000," he said.

"It was a big shock, they're a big company, you don't expect that sort of thing. No, I didn't think they'd go under.

"I don't really know what will happen to all the stuff I have supplied to them when they sell it off. It seems I'd lose that from what I can gather."

Mike Hollier runs a metal fabrication business and is owed about $42,000. ( ABC News: Glyn Jones )

Marco Da Silva said he was hopeful the business would be sold, but was not confident of getting the $25,000 he was owed.

"Ideally, we'd like to get our money, so hopefully they can sell the businesses off in their individual capacity and we can continue to trade out of that," Mr Da Silva said.

"It's negative, but one has to remain unemotional and try and apply themselves and focus on the business and do the right things by the staff."

Marco Da Silva is not confident of getting the $25,000 he is owed. ( ABC News: Glyn Jones )

Australian Subcontractors Association board member Louise Stewart said she had grave concerns leaving the meeting.

"I'm very concerned. There was no talk of a project bank account being set up. RCR haven't been paid by a number of their clients, the project owners, the principals that actually own the projects," Mrs Stewart said.

"What we don't want to happen is for those funds to be paid directly to RCR, who are now in administration, and those monies to be used to pay secured creditors.

"Subcontractors are the biggest class of creditor affected here.

"We want to see that money going to subcontractors who have done the work, they should be paid and it's very important that happens."

Collapse after a $100m injection of funds

The collapse of the business, which is one of the oldest engineering names in Australia, stunned many in the investing world.

Just three months ago, RCR raised $100 million from shareholders to buffer itself against the losses it had incurred on the solar projects, but it wasn't enough to save the business.

The move led many in investor circles to question what the board had not been telling shareholders and raised questions about whether the nation's corporate regulator, the Australian Securities and Investments Commission (ASIC), would get involved.

The collapse of the business stunned many in the investing world. ( www.rcrtom.com.au )

The company is also facing a class action which was launched on behalf of shareholders in the New South Wales Supreme Court.

Lawyers Quinn Emanuel Urquhart and Sullivan filed the action, saying investors paid too much for their shares because the market was not informed of the problems the company was having with their solar projects.

Fundamentally, many analysts said the company ran too hard at the solar game without knowing enough about it, and found itself working in an environment of rising equipment costs, increasing wages and a lack of workers skilled in the renewable energy space.

RCR Tomlinson has more than 3,400 employees working on projects around Australia. ( Supplied: RCR Tomlinson )

It also underestimated the time it could take to gain grid approval from the nation's electricity regulator, the Australian Energy Market Operator (AEMO), which has toughened its testing regime to ensure reliability of the network.

RCR's collapse prompted AEMO to issue a warning to all new entrants to "discuss early with network businesses … prior to making commercial commitments" so as to "avoid delays during project development, registration and commissioning".

McGrathNicol said it would like to ask for a three-month extension for the second meeting with creditors to give more time to investigate what went wrong with the business.