The plan is the centrepiece of the coalition's renewable energy policy, announced in Albany yesterday.

The coalition proposes building another seven wind turbines at the Albany wind farm, taking the total number of turbines to 19. The cost of $21 million would be funded from state-owned utility Western Power's capital works budget.

Barnett said the wind farm would produce enough power to meet 90% of Albany's energy needs.

"When completed the total windfarm will save something like 125,000 tonnes of greenhouse gas emissions," he said.

"It's a very significant project, not just for Albany but in terms of Western Australia's environmental credentials."

The coalition also committed to ensure that 4% of the state's electricity comes from renewable sources and promised to retain subsidies for solar hot water systems.

Treasurer Eric Ripper said simply expanding the wind farm would give more market dominance to Western Power and the Labor Government preferred to open up the market for private projects, such as Alinta's wind farm near Gerladton and Griffin's wind farm near Cervantes.

Premier Geoff Gallop said labor was considering expanding the Albany wind farm but it also wanted to build another 12 similar wind farms around the state.

Gallop said the aim was to increase the amount of renewable energy in the system from 1% to 6% by 2010.

Greens (WA) energy spokesman Robin Chapple welcomed Labor's 6% target.

"The target raises the bar in Western Australia and will mandate the construction of some 270MW of new renewable energy projects, enough to begin taking advantage of economies of scale," Chapple said.

The Greens also welcomed several other ALP initiatives, particularly the announcement that the proposed desalination plant would be completely powered by renewable energy.

But Chapple said such a policy was of little value if the Government continued to flirt with the idea of building a new coal fired power station.