Green Energy Corridor (GEC)

The Green Energy Corridor (GEC) is a government programme to build new electricity transmission lines and substations so that power from solar and wind plants can reach homes and factories. Renewable plants are often built in sunny or windy places far from cities, like the deserts of Rajasthan or the coasts of Gujarat and Tamil Nadu. The GEC builds the "highways" that carry this clean power to where it is needed. It is run under the Ministry of New and Renewable Energy (MNRE).

Why is it needed?

Building a solar park takes about one to two years. Building a large transmission line can take much longer, because of land, forest and right-of-way approvals. If power lines are not ready, the electricity produced cannot be sent anywhere. Then the plant has to cut its output, which wastes clean power and hurts investors. Think of a farmer who grows a big harvest but has no road to the market: the crop rots. The GEC is the road.

There is a second problem. Solar and wind power are variable: they rise and fall with sunshine and wind. The grid must balance supply and demand every second. Weak lines and no storage make this balancing harder.

How is India's power grid organised?

Electricity is carried in two layers:

• Inter-State Transmission System (ISTS): big lines that carry power from one state to another. These are planned at the national level and mostly built by central agencies like POWERGRID or by private firms through bidding.
• Intra-State Transmission System (InSTS): lines within a state, owned and run by each state's State Transmission Utility (STU).

The GEC has worked on both layers, but the Intra-State GEC (the InSTS part) is the main scheme, because states often lack the money to build new lines fast enough.

Where did it come from?

The idea came from a 2012 report on "Green Energy Corridors" prepared by POWERGRID. It came at a time when India was setting big renewable targets. The intra-state programme then rolled out in phases:

• GEC Phase-I (from 2015-16): Covered eight renewable-rich states: Tamil Nadu, Karnataka, Rajasthan, Andhra Pradesh, Maharashtra, Gujarat, Himachal Pradesh and Madhya Pradesh. It aimed at about 9,700 circuit kilometres (ckm) of lines to evacuate about 24 GW of renewable power. Funding: 40% grant from the Centre (MNRE), 40% soft loan from KfW (the German development bank) and 20% equity from the state utilities.
• GEC Phase-II (approved January 2022): Covered seven states: Gujarat, Himachal Pradesh, Karnataka, Kerala, Rajasthan, Tamil Nadu and Uttar Pradesh. It aimed to integrate about 20 GW of renewable power, with about 10,750 ckm of lines originally planned. The Centre funds 33% of the cost (about ₹12,000 crore total project cost).
• GEC Phase-III (approved 2026): Much bigger and the first to include battery storage: about ₹1.86 lakh crore for intra-state transmission plus 50 GWh BESS, aimed at evacuating up to 135 GW, with ₹54,082 crore of central support, targeted to finish by 2032-33.

Alongside these, the Centre also approved a special inter-state project in 2023 to carry 13 GW of renewable power from Ladakh (with battery storage) to the national grid, with a cost of about ₹20,774 crore.

How does it work?

Step by step:

1. The Central Electricity Authority and state utilities plan where new renewable plants will come up and what lines are needed.
2. The state utility prepares projects (lines, substations, now batteries) and seeks approval under the scheme.
3. The Centre gives a share of the cost as grant (Central Financial Assistance), and the state raises the rest through loans or its own funds.
4. New projects are built either through Tariff-Based Competitive Bidding (companies bid, and the lowest charge wins) or, for upgrading existing lines, on a cost-plus basis.
5. Once built, the lines carry renewable power to consumers, and the batteries store extra power for later.

India's position

India has committed to reach 500 GW of non-fossil fuel power capacity by 2030 and to get about 50% of its installed power capacity from non-fossil sources by 2030 (this target was met early, in 2025). As of 31 July 2026, non-fossil capacity stood at about 300.5 GW out of about 552 GW total installed capacity. Solar is the largest part (about 164.6 GW), followed by wind (about 58.1 GW). Without enough transmission, this rapid growth would hit a wall.

Commonly confused concepts

• ISTS vs InSTS: ISTS carries power between states; InSTS carries power within a state. GEC-III is an InSTS scheme.
• Green Energy Corridor vs Green Hydrogen Mission: The GEC is about power lines and storage. The National Green Hydrogen Mission (2023) is about producing hydrogen fuel using renewable electricity.
• Installed capacity (GW) vs energy (GWh): A gigawatt (GW) is the size of a power plant or line: how much power it can deliver at one moment. A gigawatt-hour (GWh) is the amount of energy delivered over time. A 1 GW plant running for one hour produces 1 GWh.
• Circuit kilometre (ckm) vs route kilometre: Route km is the physical length of the line's path. A tower can carry two circuits, so one route km with two circuits counts as two ckm.
• Curtailment vs load shedding: Curtailment means switching off supply (for example, a solar plant) because the grid cannot take its power. Load shedding means cutting supply to consumers because there is not enough power.

Issues, criticism and the way forward

• Land and right-of-way: Getting land and permission to pass lines over farms and forests is slow and leads to protests and court cases.
• Weak state utilities: Many state power distribution and transmission companies have heavy debts. This makes it hard for them to raise their share of the money.
• Execution delays: Earlier phases ran behind schedule; Phase-I's line target was revised, and timelines were extended.
• Wildlife conflicts: Overhead lines in Rajasthan and Gujarat pose a collision risk to the critically endangered Great Indian Bustard. The Supreme Court has dealt with requests to put some lines underground in its habitat.
• Supply chain: Batteries need minerals like lithium, which India mostly imports.
• Way forward: Plan transmission ahead of renewable plants ("transmission first"), use competitive bidding to cut costs, combine lines with storage, and improve the finances of state utilities.

Concepts to Know

• Transmission vs distribution: Transmission moves power at very high voltage over long distances, like a highway. Distribution delivers it at lower voltage to homes and shops, like local streets.
• Substation: A facility that changes voltage levels (up or down) and connects lines together.
• Evacuation of power: Taking power out of a generating plant through lines so it can be used elsewhere.
• State Transmission Utility (STU): The state-level company that plans and runs the high-voltage power network in a state.
• Tariff-Based Competitive Bidding (TBCB): A method where companies compete to build a project, and the one asking for the lowest yearly charge wins.
• Central Financial Assistance (CFA): Money given by the Centre to states as a grant for a project.