All money raised from increased carbon taxes is to be ring-fenced to fund climate action projects.
The Taoiseach will make the announcement at the UN Climate Summit later.
Leo Varadkar is in New York this week for a series of UN summits and meetings with other world leaders.
Today it's the Climate Action Summit - where leaders from around the world are expected to outline what they're doing to combat climate change.
Leo Varadkar will address the summit later and confirm that increased revenue from a hike in the Carbon Tax will be ringfenced for climate action projects and funding a just transition.
The Taoiseach expects it to raise billions of euro over the coming years.
An all-party Oireachtas committee has committed to raising carbon taxes from 20 euro a tonne to 80 euro a tonne by 2030.
It would mean increases in the price of fuel, briquettes and coal among other things.
The Taoiseach argues that re-investing the money raised in ensuring a just transition will offset the impact of fuel and energy cost increases.
Reporting by Sean Defoe.