The independent body published a notice of the deferral on Monday for the application by 'Wagga Solar Farm' on Windmill Road at Bomen, which followed a panel hearing by teleconference on July 30.

"The panel agreed to defer the determination of the matter until required information and assessment is provided by the applicant," the notice stated.

"The panel requires submission of an independent assessment of the visual impact and potential glare impact of the proposed development.

"The independent assessment shall be prepared by a suitably qualified expert, whose appointment shall be endorsed by [Wagga City] Council."

Workers are currently building the $32.1 million first stage of the project on Windmill Road, 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.

Eunony Valley Association members are opposed to the expansion over claims of environmental, amenity and bushfire risk impacts.

Metka EGN Australia general manager Ian Kirkham told the hearing last month that the company had successfully constructed 80 solar project around the world and the company was "very proud" to "be remaining in strict compliance with consent conditions".

The planning panel's decision was unanimous but panel members Wagga City councillors Dallas Tout and Tim Koschel were apologies for the hearing last month.

The independent assessment sought by the panel will address the" veracity of the existing information provided by the applicant regarding visual impact" and "verify that the development footprint is appropriate to prevent adverse visual or glare impacts".