They are still working on RTGs. https://www.thehindubusinessline.com/economy/isro-barc-join-hands-to-develop-nuclear-engines-for-rockets/article67087038.ece htt

They are still working on RTGs. https://www.thehindubusinessline.com/economy/isro-barc-join-hands-to-develop-nuclear-engines-for-rockets/article67087038.ece https://www.thehindubusinessline.com/economy/isro-barc-join-... Above was paywalled, check this https://www.reddit.com/r/ISRO/comments/151j6zw/isro_barc_join_hands_to_develop_5_watt/ https://www.reddit.com/r/ISRO/comments/151j6zw/isro_barc_joi...