Net assets for the plans reached an all-time high of $10.1 billion as of March 31, 2013, up from $9.4 billion a year earlier.
But Blaine Higgs says despite the good returns, the province still had to make about $140 million in special payments to the plans, and there were pension payouts of more than $305 million.
He says they need to get to a point where extra payments aren't necessary for the plans to meet their requirements.
The public service plan, which covers about 32,000 people, has a $1 billion deficit and is only about 50 per cent solvent.
The province is moving to a shared-risk model for pension plans where pensions for retirees would be based on average earnings over an employee's career, rather than just their best years.