The redundancies follow Carillion’s announcement late last year that it planned to shed 1,500 jobs in the wake of the government’s cuts to feed-in tariff rates which undermined the solar power market.

The job loss total has now been revised to 1,400 with the remaining 220 set to leave Carillion Energy Services this year.

The bulk of the job losses so far – 800 – have been through voluntary redundancy.

A Carillion spokesman said: “As we have stated before, the energy services business is restructuring in line with changes in market opportunities following the government’s decision to cut feed-in-tariffs for solar PV systems, by much more than the industry expected.

“We anticipate reducing the workforce by around 1,400. This is being phased over a period of time as we fulfil existing business commitments.

“However, we can confirm that around 1,180 people have now left the business. Of these more than 800 opted for voluntary redundancy as part of the consultation process.

“The remaining reductions are through a mix of redeployment to other parts of the business wherever possible, people leaving the business naturally or through compulsory redundancies.

“Clearly, we are disappointed that we have to take this action, but everything is being done to help staff through this difficult period.”