REGINA — Federal Liberal Leader Michael Ignatieff is promising big money for clean energy, but he won't say how much.

Ignatieff told more than 350 people in Regina that the Liberals would make the "most significant investment in clean energy" that the country has ever seen.

He says Canada is getting left behind when it comes to clean energy technologies that will boost the economy and tackle climate change.

But when pressed by reporters, Ignatieff wouldn't put a dollar figure on how much the Liberals might commit to their plan.

The comments came after Prime Minister Stephen Harper announced that Ottawa is investing $343 million from its $1-billion clean energy fund to help a plant in Alberta capture and store carbon dioxide.

Ignatieff questioned whether there was any new money in the announcement.