"Transmission, not generation, is now the binding constraint on India's renewable transition." Examine with reference to the Green Energy Corridor programme.

Solar and wind make up 37% of installed capacity but supply only 13% of electricity [1]. Part of this gap is intermittency. Part of it is a grid that cannot carry renewable energy (RE) out of resource-rich States. Transmission, more than new generation, now sets the pace of the transition.

Why transmission is the binding constraint

• Execution lag: only 58% of targeted transmission lines were added in 2024-25 [1].
• Unfinished corridors: GEC-I and GEC-II planned about 44 GW of evacuation across 10 States, but only about 26 GW has been integrated [2]. GEC-I was due in 2022 and slipped [3].
• Curtailment: RE output is forced down in peak solar hours when intra-state lines are congested [4].
• Gestation mismatch: solar parks come up faster than lines, which face right-of-way and land-acquisition hurdles.

How the Green Energy Corridor responds

• GEC-I (8 States, ~24 GW, 40% central assistance) and GEC-II (7 States, ~20 GW, 33%) built dedicated intra-state lines [3].
• An inter-state GEC-II component carries 13 GW from Ladakh [5].
• GEC-III (approved 30 Sep 2026) will evacuate up to 135 GW within States and add 50 GWh of battery storage. Its outlay is ₹1,86,405 crore and the target date is FY 2032-33 [4].
• TBCB and BOOM models bring in private Transmission Service Providers [4].

Constraints beyond transmission

• Storage: a four-hour battery holding 50 GWh can supply about 12.5 GW. That is under a tenth of 135 GW.
• Discom finances: under-priced tariffs and high technical and commercial losses weaken discoms' ability to pay transmission charges [1].
• Falling central share: the Centre funds about 29% in GEC-III, against 40% in GEC-I, so States carry more of the cost [3][4].

Way forward

• Release central support when lines are energised, not when contracts are awarded.
• Settle routes with forest and mining authorities before bidding.
• Plan GEC-III batteries and Viability Gap Funding for storage through one State-wise list of sites [1].
• Pair new corridors with discom reform under RDSS, which takes 60% of the Power Ministry's 2026-27 budget [1].

Transmission has overtaken generation as the tighter constraint, and GEC-III's scale and storage focus recognise this. Delivery on time will need capable STUs, solvent discoms and coordinated storage. That will decide whether India reaches 900 GW of non-fossil capacity by 2035 [4] and meets SDG 7's goal of affordable, clean energy.