Carillion, which went bust on Monday with debts of about £1.5bn, is the lead contractor on the Westhampnett solar farm project, which is due to be completed in February.
A county council spokesman said: "In line with the official receiver’s priority to ensure continuity of public services, the final work by Carillion’s sub-contractors to complete the solar farm will go ahead.
"We do not expect there to be any impact on services for our residents as a result of this announcement."
The county council has worked in partnership with Carillion since 2014 on Your Energy Sussex, which has delivered a range of energy efficiency and renewable energy projects.
The spokesman said the company had no ongoing role in the running or maintenance of the council's renewable energy systems.
Carillion's sub-contractors installed solar panels at eight West Sussex schools in 2015 and a further three in 2016.
Members approved a further £3m of funding last year, and the council is now working with Portsmouth City Council to install solar panels at nine more school throught January and February.