New Delhi, July 1 -- New Delhi: Global renewable energy capacity is expanding, but not fast enough to meet the world's energy transition targets, said Gauri Singh, deputy director general of the International Renewable Energy Agency (IRENA).

Singh, however, expressed optimism about the overall trajectory in the green energy space, noting that the transition remains on course due to the "strong business case" for renewables.

"We are in a very challenging space geopolitically, but we are making good progress towards meeting the tripling target for 2030. I won't say it's sufficient, but it's quite optimistic," Singh said in an interview.

"We are at about 4.5 terrawatts. We need to be nearly 11 terawatts (11,000 GW) by 2030. That would req...