Mr Corbell said the 20MW array off the Monaro Highway at Royalla, which will go live in a couple of weeks, was twice the size of any other solar farm in the country and the largest feeding into the national grid. Its nearest rival was a 10MW solar farm in Western Australia.

He said the Uriarra solar project, now in planning, would also be 10MW and its significance on the national scale should not be underestimated. He rejected residents' characterisation of the 27-hectare solar array at Uriarra as an industrial site.

"These are PV panels sitting in a field," he told the ACT Assembly. "They don’t create noise, they don’t create emissions, they don’t create all of those things that are associated with an industrial plant. But, of course, the opponents ... want to characterise it as that because in doing so ... they hope to attach the emotional language that comes with industrial, manufacturing or mining or other resource-intense facility."

The solar farm was low impact, environmentally beneficial and simply harnessed the power of sunlight, Mr Corbell said.

Elementus Energy has signed a lease with Tony and Helen Griffin for a block on Uriarra Station and plans to build the solar farm beside Brindabella Road, directly across the road from the 100-household-strong Uriarra village.

The residents have swamped the government with objections to the plan. Of the 120 submissions on the company's application, more than 80 were from residents, just one of whom supported the project.

A bushfire consultant commissioned by the residents has judged the solar plant a bushfire risk and recommended the new 222V power line to run past the village be buried underground, at least where it passes the village.

The consultant also said the trees, which will be planted to act as a screen for the solar farm, be pushed back at least 155 metres from the road to ensure the access in and out of the village was usable in a fire.

The Liberals' Andrew Wall said the project had a litany of flaws, including the damage it would do to property values in Uriarra and the bushfire risk. Residents were not opposed to solar power but to the site, he said.

But Mr Corbell rejected concerns about the power line, saying the village was already powered by an overhead electricity line through the same corridor as the planned solar-farm line.

The ActewAGL line is 11V, but Mr Corbell said it was "not a big difference when it comes to starting a fire". "One spark will start a fire, it doesn't matter about the power of the line," he said.

Farmers wanted solar and wind farms because it helped them diversify and access a reliable income stream, he said.

The importance of the project should not be underestimated at a time when the federal government was sending a message to companies and countries around the world that Australia was not interested in renewable energy.

When Royalla begins operating in September, ActewAGL will pay it $186 for each megawatt hour fed into the grid. The company is expected to generate about 37,000 megawatt hours a year, and the maximum it will be paid for is 42,293 megawatt hours.