The West Australian Government's decision to increase the fixed supply charge for electricity could send the state's grid into a death spiral, an energy sustainability expert has warned.

Treasurer Ben Wyatt yesterday announced a range of budget repair measures that will see average households fork out almost $440 more each year.

About $169 of that can be attributed to a doubling of the fixed charge component of electricity bills for those connected to the grid.

Dr Green believes the increase in the fixed charge could backfire in the long run. ( ABC news: Brianna Shepherd )

Curtin University sustainability expert Jemma Green said the price rise could see households embrace alternative energy sources.

"The perverse outcome of increasing the fixed supply charge is that in the short-run you might get more money, but in the longer run you're going to push people off the network and look for more cheaper alternatives," she said.

"That taken to the extreme means the network is no longer getting the revenue needed to support itself and it creates a death spiral."

Western Australia has the highest uptake of solar energy in the country, driven by rising power prices and falling technology costs, with installations rising by 33 per cent last year.

Dr Green said while the increase in fixed costs was a relatively fair way of repairing the budget, the 25 per cent of WA households that had invested in solar would feel worse off.

"I think this is a solution for the near term, but a more holistic solution on tariff reform will be needed to maintain utilisation of the grid and deal with the budget both at the same time," she said.

Big power users the winners: Nahan

Opposition Leader Mike Nahan said it was a blow to those who had invested in solar panels because they would not be able to avoid the increased supply charge.

Opposition Leader Mike Nahan says big power users are set to benefit the most. ( ABC News: Eliza Laschon )

"It's a massive hit ... and you can't do anything about it. Indeed the people who benefit a lot from these increases are the people who use a lot of electricity," Dr Nahan said.

Opposition energy spokesman Dean Nalder agreed and said the change in power pricing disproportionately affected those who use less than average power.

"You can't reduce this ... by reducing your consumption of electricity, you have to pay it regardless," he said.

"If you're a less than average consumer of power it's more than a 10.9 per cent increase in your bill. So for smaller households this is a substantial increase.

"It's really discriminatory on those that use less power, and potentially those that have made the effort to go [to] renewable energy and put solar panels on their roofs."

Nationals renew mining tax call

The WA Nationals Leader Mia Davies accused the Government of targeting families in its bid to fix the State's budget.

Ms Davies said rather than slug mums and dads, it would have been better to implement her party's proposed mining tax.

"I do think ordinary West Australians will be looking for a revenue source that means they don't have to bear the brunt of what's happening right now," Ms Davies said.

"From our perspective there is a revenue source there ready and waiting, they just need to have the intestinal fortitude to actually go and have the discussion."

The fee increases take effect from July 1.