The NSW Greens Party is blaming the Keep Sydney Open political party for a fall in its primary vote in the state election, denying an internal factional war was responsible.

While the Greens have held onto three lower house seats, the party suffered a statewide fall in its primary vote of 0.8 percentage points, slightly less than Labor's drop.

Upper house Greens MP David Shoebridge said the Keep Sydney Open party largely took votes away from his party, despite the fact "it doesn't look like that's going to result in increased representation" in Parliament.

Upper house Greens MP David Shoebridge. Credit:Dominic Lorrimer

“There is no doubt that it had an impact across the state on our vote,” he said. “But we grew the margins in our three lower house seats.”