India’s energy sector is entering a phase where merely adding generation capacity will not be enough to meet evolving requirements. The growing share of renewable energy will require a grid that can respond flexibly to fluctuations in both generation and demand. This is where Energy Storage Systems (ESS) become increasingly important to India’s energy landscape.
Our country has already made progress in deploying energy storage, with battery energy storage systems (BESS) and pumped-storage projects at various stages of development. The Central Electricity Authority projects a significant increase in storage requirements as renewable generation expands, with both technologies expected to support grid flexibility and reliability.
From energy storage to grid flexibility
In the past, power systems have mainly revolved around balancing electricity generation and consumption based on prevailing demand. However, the growing share of solar and wind generation is making power generation more variable and increasingly dependent on weather conditions.
Solar energy is primarily generated during daylight hours while demand may be higher in the evening. Weather can affect wind energy generation. Energy storage solutions can solve this mismatch by storing excess electricity during the generation peak and releasing it when demand rises. Energy storage systems have become an essential tool for providing flexibility to renewable-based power systems. They can do more than shift electricity from one point in time to another.
At the distribution level, they can help manage local peak loads, integrate distributed generation and defer investments in network infrastructure. This shifts the focus from how much storage capacity India installs to how effectively it can be deployed to create a more flexible and reliable grid.
The smart grid needs more than storage
A smart grid is fundamentally about responsiveness. It essentially integrates generation, transmission, distribution, digital monitoring, automation, electronics as well as flexible power resources to respond accordingly to system conditions. ESS is a valuable addition to this network because it can respond rapidly to changing system conditions and provide grid-support services.
By employing appropriate control systems and inverter technology, storage can provide frequency regulation, voltage support and other grid-support and ancillary services, helping improve the flexibility, stability and reliability of the power system. While these technologies can significantly improve efficiency and controllability, the growing share of inverter-based resources also introduces new considerations around power quality and grid stability, including harmonics, voltage fluctuations and reactive power management, depending on system configuration and operating conditions.
Power quality will be critical to unlocking storage’s potential
While batteries take the role of energy storage devices, they still need to interact with the electrical grid, with power electronic interfaces such as converters and inverters. Therefore, the efficiency of storage devices does not depend solely on their energy capacity but also on the ability to interact with electrical infrastructure. As more inverter-connected devices are integrated into the grid, issues such as harmonics, reactive power, voltage fluctuations and power factor management become important.
For industrial and commercial users, maintaining adequate power quality is crucial for the reliable operation of sensitive devices and the efficient use of electricity. As renewable energy sources, battery energy storage systems, data centres, EV charging stations and other power-electronics-based devices become more widespread, it will become necessary to adopt a more comprehensive approach to improving grid performance rather than focusing only on optimising the functioning of individual facilities.
Moving towards a more intelligent and resilient grid
Grid-forming inverter technology is emerging as yet another indication of the evolving role of storage. In contrast to conventional grid-following systems, which depend on an existing grid voltage and frequency reference, grid-forming technologies are capable of establishing or helping to establish voltage and frequency characteristics, thereby allowing storage to operate in weak or inverter-dominated grids.
As India’s policy and technical discussions around storage co-location, grid-forming capabilities and renewable integration evolve, storage is increasingly being viewed as an integral part of the electricity system. This shift is important because the future power system will need to do more than generate and distribute electricity. It will also need to balance variable generation and demand while maintaining grid stability and power quality.
The next step is integration, not simply capacity addition
India’s energy transition is often measured in gigawatts of renewable capacity and gigawatt-hours of storage. Those numbers are big, but they only tell part of the story. The true worth of storage is determined not just by its capacity, but also by its ability to be integrated with transmission and distribution networks, renewable generation, digital control and power quality technologies. With the transition to a more renewable and electrified economy, the grid will have to rely on traditional generation sources, renewable energy, and electricity storage.
The future smart grid will not be defined simply by how much energy it can store. The success of the future smart grid will depend on how efficiently it can generate, store, process, distribute and control electricity while maintaining grid stability and power quality. Energy storage can provide flexibility to a renewable-rich grid. The challenge now is to ensure that this flexibility is backed by the right power infrastructure, control systems and power-quality solutions.
