India to Require State Utilities to Add Energy Storage Capacity

India is moving storage from an optional upgrade toward a required part of renewable-power planning. Federal authorities will direct state-owned utilities to add capacity. The goal is to capture more clean electricity and reduce waste when solar and wind production exceeds immediate demand or grid capacity.

From July 2027, solar and wind developers must install battery storage at project sites. India is also preparing more clean-energy tenders focused on storage. These measures target the practical limits that have prevented the grid from using all available renewable generation.

The need is urgent because India reportedly curtailed up to 118.6 gigawatts of solar and wind capacity in September. Storage can hold electricity for later use, while stronger grid flexibility can help balance supply and demand. Together, the requirements aim to reduce curtailment and improve renewable power delivery.

Energy storage is equipment that takes in electricity, holds it, and supplies it later. It matters because electricity production and demand do not always occur at the same time. Storage gives the grid a way to shift energy from periods of high generation to periods of higher need.

Batteries charge when solar or wind output is plentiful, then discharge when production falls or demand rises. Pumped-storage projects use electricity to move water to a higher reservoir. Later, the water flows downhill through turbines to produce electricity. Both approaches can provide flexibility, though they use different technologies.

India’s planned program includes 30 gigawatt-hours of battery storage and 60 gigawatt-hours of pumped storage. These systems could help reduce renewable curtailment, ease pressure from mismatched supply and demand, and make more clean electricity available when the grid can use it.

India reportedly curtailed as much as 118.6 gigawatts of solar and wind power capacity in September. Curtailment occurs when renewable generators could produce electricity, but the grid limits or stops that output. The electricity is therefore available in principle but not delivered to users at that moment.

The article links the September figure to grid, flexibility, and transmission constraints, along with limited battery storage. If renewable generation rises beyond what demand, transmission lines, or grid operations can accommodate, operators must reduce some output. This can happen even when clean power is technically available.

Curtailment means India loses an opportunity to use renewable energy it has already developed. The government wants storage and additional flexibility to reduce that waste. Its planned 92-gigawatt-hour program and the July 2027 battery requirement for new solar and wind projects are intended to address the problem.

Curtailing solar and wind means the grid receives less electricity from those sources than they could have generated. The lost output cannot serve homes, businesses, or industry at that time. This reduces the immediate benefit of India’s growing renewable capacity and leaves more demand to be met by other available supply.

The article shows how this problem can coexist with power shortages. India experienced power availability shortages in July and August even as renewable generation and solar output reached records. That contrast reflects a timing and delivery problem: high renewable production is not automatically available everywhere or whenever consumers need it.

Storage could change the outcome by saving excess renewable electricity and releasing it later. More transmission and grid flexibility could also move or balance power more effectively. India’s planned storage funding and new project requirements aim to make renewable electricity more dependable and usable.

Demand-generation mismatches occur when solar and wind produce more electricity than consumers need, or produce it at the wrong time or place. Electricity must be balanced continuously, so unused generation can be curtailed when demand is moderate. The article identifies seasonal overlaps between high renewable output and moderate demand as one example.

Transmission constraints create a second problem. Power may be available in one area but unable to travel through lines with enough capacity to reach another area. Limited storage and grid flexibility make both problems harder because the system has fewer ways to shift electricity, absorb surpluses, or respond when output changes.

These constraints help explain why India curtailed as much as 118.6 gigawatts of solar and wind capacity in September. Storage can move excess generation into later periods. Additional transmission, flexible operations, and planned tenders could help India use more of its renewable output instead of rejecting it.

India’s federal government approved a $1.54 billion, or 145 billion Indian rupee, Viability Gap Funding program for 92 gigawatt-hours of grid-scale storage. The support is meant for storage systems that have not yet been commissioned. It aims to improve project finances and speed large-scale deployment.

The program allocates 30 GWh to battery energy-storage systems. It assigns 60 GWh to pumped-storage projects and 2 GWh to emerging storage technologies. Batteries can store and release electricity directly. Pumped storage uses reservoirs and elevation to shift electricity over time. The emerging category covers newer approaches identified by the program.

The investment responds to curtailment and limited flexibility in India’s power system. The government also plans storage tenders and requirements for utilities. Together, these steps could expand the ability to save surplus renewable power and supply it when demand or grid conditions make it useful.

Solar and wind power are variable sources. Solar output changes with daylight and cloud conditions, while wind output changes with wind conditions. Electricity demand follows its own pattern. Because production and demand can move differently, the grid needs ways to balance them continuously.

Many traditional power plants can be scheduled or adjusted more directly, but renewable output may be strongest when demand is only moderate. India’s JMK Research & Analytics identified demand-generation mismatches, seasonal overlaps, transmission constraints, limited storage, and limited grid flexibility as causes of curtailment. These limits can force operators to reject available renewable electricity.

A flexible system can respond by storing surplus power, shifting delivery, or using stronger transmission connections. Batteries and pumped storage provide ways to move electricity across time. India’s storage program and future battery requirement for solar and wind projects are designed to make variable renewable generation easier to use.