The Southern Regional Planning Panel is due to publish its decision on a Bomen solar project's $26.8 million expansion.
The Eunony Valley Association, whose members oppose the expansion on environmental and amenity grounds, had expected a decision by Thursday.
Workers are currently building the $32.1 million first stage of the 'Wagga Solar Farm' on Windmill Road at Bomen, which aims to generate 30 megawatts from 116,550 panels.
UK-based company Metka EGN has sought to expand the site with another 49,364 panels to add 18.7 megawatts.
The planning panel held a hearing on the proposal on July 30 via teleconference and was due to hand down a decision within seven days of the hearing.
Numerous Eunony Valley residents spoke at the hearing, which lasted for more than two hours and detailed their concerns about sun glare, visual impact, loss of agricultural land, water runoff and harm to native animals.
Three representatives involved in planning and operating the solar project spoke in favour of approving the planning application.
Eunony Valley farmer and Rural Fire Service Group Captain Graham White told the hearing that there had been "absolutely no consultation" with the area's firefighters about the solar project's access for fire trucks.
"RFS rules say that I cannot get a truck on a site with a side slope above 14 degrees, so it would be impossible for us to protect that land and its surrounds," he said.
Metka EGN Australia general manager Ian Kirkham told the hearing that the company had built "probably in excess of 2000 megawatts of solar and energy storage projects globally".
"That equates to roughly 75 to 80 solar farms that we have constructed successfully around the world," he said.
"We have been established in Australia for around two years now and we have invested already in excess of $120 million of the company's own equity in regional NSW projects."
Mr Kirkham said the company was "very proud" to "be remaining in strict compliance with consent conditions" during project construction.
"We operate safely and to industry best practice, and also within the local community in which we construct our projects, we ensure there is a strong local economic benefit...a lot or service providers and our on-site construction staff are employed from the local population," he said.
David Walker, a senior town planner for the Premise design consultancy firm, told the hearing that his company supported the Wagga City Council's recommendation to approve the solar project expansion.
Mr Walker said the project would be "safe, sustainable and without unreasonable impact on the surrounding locality".
"We're very proud to be involved with this project and delivering a project of this nature...the proposal provides the delivery of renewable energy and this reduced the dependence on fossil fuels and is therefore in the public interest," he said.
Mr Walker said the project was "permissible in the zone" in terms of council and state planning policies and disputed claims by some residents that solar power generation was an industrial development.
"The site is well suited to the proposal, it is visually shielded by the surrounding topography," he said.