The Workers' Party says that nuclear power is the only energy option for Ireland which is reliable, affordable and low carbon.
It has called for its immediate introduction.
At the launch of its policy document "Lets Get Real", the party advocates Ireland building 6 conventional nuclear plants at 2 or 3 sites for an estimated cost of €50 billion.
Garrett Greene asserted that nuclear power is the only option when it comes to on-demand and zero-carbon energy.
The Workers' Party argues nuclear power would also do away with green taxes, which he described as an austerity measure for people on low incomes, which had very little effect on high earners.
He said the latest statistics suggest that 20% of renters are in arrears on their energy bills, and this proved the carrot was for the rich and the stick for the poor.
Caoimhe Garland said that nuclear power was the fastest route to decarbonisation in Ireland, and this was proven when France switched to nuclear power. She said Ireland should make the switch immediately.
Mr Greene, who is an Assistant Professor at UCD, contended that a 100% renewable grid "will never be achieved".
He argued that adopting nuclear power would mean that vast tracts of bogs would not be zoned for wind farms and could, instead, be freed for biodiversity.
He said if Ireland went nuclear, then it should be State-owned and funded through bonds.
Mr Greene suggested that as well as powering Ireland, €1 billion worth of energy could also be exported to Europe.
Asked if the Irish public would support nuclear, given accidents at Chernobyl and Fukashima, he argued that if the data on nuclear power was given to people in an unbiased way then they would choose it.
He contended people are "told to be afraid" about nuclear power plants but, equally they travel to countries like France where 80% of the state's power comes from that energy source.
Denis Duff, from the NGO, 18for0, said targets and aspirations are not answers - nuclear power is.
He suggested nuclear plants could be built at existing or old electricity generation stations and it would be possible to restring old pylons to deliver electricity.
