Adani Green Expands Battery Storage to Reduce Renewable Power Curtailment

Adani Green Energy (AGEL) is making battery storage an increasingly important part of its renewable energy business, as transmission availability becomes a constraint on delivering electricity from large solar and wind installations.

In an announcement on 1 October, the company said operational battery energy storage system capacity at Khavda had reached 6.63 gigawatt-hours (GWh), up from 3.55 GWh in June. The installation forms part of its planned 30 GW renewable energy development in Gujarat. AGEL described the battery facility as the world’s largest operational installation at a single location. That ranking is a company claim.

The expansion illustrates a practical challenge for renewable energy developers: building generating capacity does not guarantee that all available electricity can reach customers. When network capacity is unavailable, some production may have to be reduced, a process known as curtailment.

Battery storage offers a way to retain some of that electricity and deliver it later. For developers, this creates an opportunity to improve the use of existing generation assets while offering customers more flexibility over delivery times.

A Five-Year Expansion Target

AGEL has outlined a target of 50 GWh of storage capacity over the next five years. Its October results announcement also said deployment could surpass its 10 GWh battery storage guidance for the financial year ending March 2027. These figures represent company targets rather than completed installations.

The distinction between energy storage capacity and generation capacity matters. Gigawatt-hours measure how much energy a battery can store, while gigawatts measure the rate at which a facility generates or delivers power.

A storage announcement expressed in GWh therefore does not, by itself, establish how much electricity the system can supply at any particular moment. Assessing its contribution to reliable power also requires information about discharge power, usable capacity, operating restrictions and the charging schedule.

For electricity buyers, these specifications determine whether a storage-backed renewable contract can cover a short evening peak, support a longer delivery period or meet another defined requirement.

Reducing Losses From Transmission Constraints

The report published by ET Sustainability identifies reduced curtailment and better use of transmission infrastructure as central reasons for AGEL’s storage expansion. It presents batteries as a means of converting more available renewable generation into electricity sales.

The underlying mechanism is straightforward. When renewable output exceeds the electricity that can be exported through a constrained connection, a battery can absorb part of the surplus. It can then discharge when generation falls or network capacity becomes available.

However, storage has limits. Once a battery is full, further surplus generation may still be curtailed. Charging and discharging also involve energy losses, while repeated use gradually affects battery performance.

Storage should consequently be assessed alongside transmission investment. It can improve the use of a connection across different hours, but persistent shortages of network capacity still require infrastructure and operational solutions.

Financial Growth Provides the Backdrop

AGEL’s results for the six months ended 30 September 2026 show the scale of the business supporting its storage programme. Operational renewable generation capacity reached 20.8 GW, while electricity sales increased 32% year on year to approximately 25.7 billion kilowatt-hours.

Revenue from power supply rose 36% to ₹8,299 crore. EBITDA from power supply, a company-defined operating earnings measure, increased 41% to ₹7,957 crore. For the September quarter alone, the company reported power-supply EBITDA of ₹3,835 crore. These figures should be distinguished from other EBITDA measures and reporting periods.

The commercial question for storage is whether the value of recovered generation and more flexible electricity delivery exceeds the cost of installing and operating the batteries.

Relevant costs include financing, conversion losses, maintenance and eventual equipment replacement. Revenue depends on contractual arrangements and the value of electricity at the time of delivery. Installed capacity alone therefore cannot establish a project’s profitability.

Batteries and Pumped Storage Play Complementary Roles

AGEL’s Khavda batteries use lithium-ion technology, supported by energy management systems and automated monitoring. The company is also pursuing pumped-storage projects as part of its broader approach to dispatchable renewable electricity.

AGEL said its share of India’s operational battery storage capacity exceeded 50%. It based that calculation on Central Electricity Authority (CEA) data for August 2026, supplemented by industry disclosures from September, so the comparison reflects a particular reporting period.

Pumped storage uses electricity to move water to a higher reservoir and generates electricity when that water flows back through turbines. Its suitability depends on geography, water availability, permitting and construction requirements.

Combining different technologies can help developers meet different delivery needs. Neither batteries nor pumped storage creates additional renewable energy, but both can change when electricity becomes available.

What the Expansion Means for Clean Power Buyers

For industrial customers and utilities, the practical value of renewable energy increasingly includes delivery timing alongside price and annual volume. Storage can help align supply with consumption, although the actual service depends on the contract and system design.

Buyers evaluating such projects should examine guaranteed delivery hours, available discharge power, performance commitments and the treatment of charging losses. Environmental assessments also need to consider charging electricity, battery production and end-of-life management.

AGEL’s expansion highlights how storage is becoming part of renewable project design. Its longer-term contribution will depend on operating performance, commercially viable contracts and sufficient transmission capacity to deliver electricity to customers.

Sources: sustainability.economictimes.indiatimes.com