Federal Labor insists households won't be paying more for electricity under its 50 per cent renewable energy objective by 2030.
And the net impact on the budget would be negligible.
Hours after Opposition Leader Bill Shorten had trouble explaining the cost of Labor's renewables policy, shadow treasurer Chris Bowen was assuring Australians it wasn't the big deal the government was claiming.
"There's no impact on electricity prices out of the policy we took to the last election, no impact on the budget," he told Sky News on Wednesday.
Mr Shorten wasn't nearly as forthright when he was asked four times to nominate the cost of the 50 per cent objective.
"For me the answer to the question about cost is that there is a cost in not acting," he told ABC radio.
When asked what it would cost consumers, Mr Shorten said: "Well, consumers are already voting with their feet with the expansion of solar panels."
