Diesel buses will be replaced with WA-made fully electric models at a rate of about 100 units per year, Premier Roger Cook said ahead of the state poll on March 8.
"From the day we are elected, we will no longer place orders for diesel busses and we'll ramp up manufacturing electric busses on our network," he told reporters from the Volgren bus workshop in Perth's northeast.
"Every electric bus we put on the road saves about 40 tonnes of carbon emissions every single year, which is made up of around 22,000 litres of diesel that each bus uses each and every year."
With about 1800 buses in the WA public transport fleet, it's expected to take about 20 years to transition the WA fleet to electric units.
Mr Cook was probed about ambulance ramping amid reports it had blown out to almost 5000 hours in January.
"No health system is perfect, but our ambulance response times are the best in the country, and we'll continue to make sure that we have improvements," he said.
Mr Cook defended Labor's promise on Sunday to subsidise home battery purchases, which has reportedly led to some buyers cancelling their current orders so they can take up the offer at a later date.
"We said we would bring it in as quickly as possible (but) we know that for many in the industry, there might be a pause in terms of the rollout of their battery products," he said.
Liberal leader Libby Mettam attacked Labor over a delay in implementing fisheries licensing and catch reporting reforms, saying it had abandoned regional fishing families.
"They'll always put their own electoral interests ahead of the interests of Western Australian fishing families," Ms Mettam told reporters in the regional town of Geraldton.
Labor has committed to implementing an amended version of the legislation if it's re-elected and said that after talks with the industry mandatory reporting for recreational fishers would be dropped.
"These were laws that were brought in by the previous government and we've endeavoured to implement them in an appropriate and timely way," Mr Cook said.
"But what we've found is those laws are just too unworkable and we could not get consensus within the industry."
Ms Mettam also addressed the Liberal's plan to reduce ambulance ramping.
"Our urgent care clinic policy will reduce ambulance presentations by about 20 per cent," she said.
She revisited previous health system pledges, saying the Liberals would open new wards and increase the number of beds in hospitals, and invest $400 million in regional health infrastructure.
The Nationals WA promised to boost funding for the regional racing industry.
"Without this funding, regional clubs will face increasing challenges to operate long-term, and many smaller clubs will likely be forced to close their doors, Nationals leader Shane Love said in a statement.
The opposition leader accused the Labor government of abandoning its responsibilities to the racing industry and failing to support vital infrastructure projects.
Mr Cook said a re-elected Labor government would continue to work with the racing clubs to support their infrastructure projects.
Experts are tipping a comfortable win for Labor, which holds 53 seats in the lower house, with the Liberals and Nationals holding three each after Labor's unprecedented landslide victory in 2021.
