A Mudgee winery has become the largest in Australia to operate its business entirely off the grid.

Lowe Wines operates its vineyard, winery, cellar door and restaurant on a solar and battery system.

Director and chief winemaker David Lowe said high electricity costs and supply issues drove the move, which had been transformative for the business.

"Before, I was actually managing the power usage. You couldn't turn an oven on or a fridge on without something else being turned off," he said.

"It was really a day-by-day, seven-day-a-week monitoring of our power usage, but the trouble was that I didn't know how much power we were using, I only knew when it was a problem."

Mr Lowe said the business was now cash positive when it came to its monthly power bill.

He said the off-grid system co

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