India's Renewable Energy Surge Meets Grid Constraints

India has achieved a significant milestone in its transition to clean energy, with renewable sources briefly meeting over half of the country's peak electricity demand in July, a feat mirrored from the previous year. This moment underscores the dramatic expansion of non-fossil fuels within India's electricity mix over the past decade.

Renewable energy capacity has surged from a mere 4GW a decade ago to 300GW, now comprising 54% of the nation's total installed capacity of 552GW. This achievement surpasses a target that was set to be met five years later, marking a substantial decarbonization effort for a country historically reliant on coal, which still accounts for 70% of electricity generation due to higher operational hours.

Despite this progress, India's renewable energy expansion is outpacing its transmission infrastructure. According to the global energy think-tank Ember, transmission constraints were responsible for nearly two-thirds of renewable energy curtailment in the first quarter of 2026, totaling 300 gigawatt-hours. This means a considerable amount of clean energy produced is being wasted because the country's transmission lines have fallen behind schedule, with one in four inter-state projects experiencing delays exceeding a year.

"Generation projects can be constructed in 18-24 months… Transmission can take much longer because they involve right-of-way, land acquisition, approvals and coordination across many agencies," explained Sumant Sinha, CEO of ReNew Power, a major clean energy company. He described this as an "execution issue that becomes more important as the system gets larger." Vibhuti Garg of the Institute for Energy Economics and Financial Analysis attributed the problem to "poor planning," noting that the grid could previously absorb 10-15GW of new capacity annually, a pace that has dramatically increased to a record 51GW last year, overwhelming the existing infrastructure. The concentration of renewable energy projects in the northwestern states of Gujarat and Rajasthan further complicates the evacuation of power amidst these grid shortages. Analysts at Ember consider this growing mismatch between fast-paced generation projects and slower transmission development to be the "most critical operational risk to the country's 2030 target of 500 gigawatts (GW) of non-fossil electricity."

While battery storage systems could have mitigated these issues by storing excess energy for later use, the growth of storage capacity has been hindered by a sharp increase in battery prices, raw material shortages, and a devaluation of the Indian currency that has raised financing costs. "Many storage projects that were meant to come up fell through as a result," Garg added.

Financing remains an industry-wide challenge. India requires an estimated $400 billion to $500 billion to meet its 2030 renewable energy targets. Currently, approximately 83% of climate mitigation finance in India is sourced domestically. Despite commitments made under the Paris Agreement for developed nations to provide financial resources to developing countries, accessing these funds has proven difficult.

"Emerging and developing economies outside China receive only around 15% of global clean-energy investment, despite accounting for roughly two-thirds of the world's population," Sinha stated. He suggested that while India does not need full financing from developed countries, support through cheaper loans, guarantees, and currency protection would encourage greater private investment.

Experts emphasize that addressing these critical gaps in finance, transmission infrastructure, and storage is essential for the ongoing energy transition to succeed.