As RE Continues to Expand, India’s Battery Storage Market a Sleeping Giant: IEEFA

Grid integration of large-scale variable renewables will be one of India’s biggest challenges as it aspires to decarbonise its power economy through deployment of 450 gigawatts (GW) of renewable energy (RE) by 2030. Reaching this target from the current installed renewable capacity of 93 GW will require average annual renewable capacity additions of ~35 GW.

The International Energy Agency’s (IEA) India Energy Outlook 2021 suggests India could further double its renewables capacity to 900 GW by 2040. With record low solar tariffs of below Rs 2.00/kWh (USD 27/MWh), renewables in India are now extremely cost competitive with coal-fired power and are set to be the dominant source of power supply for decades to come.

Currently, renewables form 10 percent of India’s total power generation and that share will increase to 31 percent by 2030 with 450GW coming online. While integration of large-scale variable renewables is one of the biggest challenges for the transition of India’s power market, leaders in large-scale renewable penetration – Germany with 46 percent, South Australia with 60 percent and California with 36 percent of total generation coming from renewables – show that it can be done.

As the share of variable renewable generation continues to increase, India’s power system will have to evolve and modernise to respond to grid stability challenges. There is a need for an accelerated deployment of assets such as utility-scale battery storage in order to store power when it is available in abundance and provide firm power later, during the evening

The cost of standalone lithium-ion battery storage systems globally has plummeted in the last decade from USD 1,100/kWh in 2010 to US$137/kWh in 2020. Bloomberg NEF (BNEF) projects costs will decline a further 55 percent to USD 58/kWh by 2030.

The IEA India Energy Outlook 2021 projects that India could have 140-200 GW of battery storage capacity by 2040 — potentially a third of total battery storage capacity in the world by then.

With the influx of ultra-cheap renewables, global power markets such as Australia, the US and UK have leveraged this cost deflation in battery storage to strengthen their grids. Grid-scale batteries have proven to be an important grid management tool to deal with frequency fluctuations on the grid.

Despite the different drivers behind the deployment of batteries in different markets, the basic model to deploy standalone batteries is somewhat similar. Utility-scale batteries with four hours of storage capacity are co-located with end-of-life coal-fired power plants to have easy access to the same network connectivity as well as utilise the same patch of land. Also, the battery systems fill the gap in lost capacity left by the retirement of the end-of-life coal-fired power plants.

Solar Energy Corporation of India (SECI), the Indian government-owned agency, has led the way for utility-scale battery deployment by implementing multiple RE plus battery storage auctions that mandate round-the-clock RE power supply. However, SECI’s efforts alone will not suffice to ensure uptake of the battery storage needed to modernise India’s grid in order to be able to handle the large injection of variable renewables. States with large load centres, such as Maharashtra, Delhi NCR, Karnataka, Gujarat and Rajasthan, must now make their own plans for utility-scale battery storage systems.

In IEEFA’s view, a ‘time-of-day’ pricing mechanism that differentiates between peak and off-peak power supply is critical to incentivise investment into such capital-intensive yet important technology solutions. Additionally, the states could offer viability gap funding (VGF) for battery storage just as they did to support the growth of ultra-mega solar parks a few years ago.