India’s green transition is missing long-duration energy storage
The longer the time over which a technology discharges energy, the better its economics. At the same time, storing more energy also costs more. So for discharge durations beyond six hours, short-duration energy storage systems are unlikely to prove cost-effective
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Context
India recently recorded its highest daytime peak electricity demand of 270.8 GW, highlighting a significant surge compared to previous years. While daytime demand is often met, the subsequent nighttime peak, driven by cooling needs, exposes a critical vulnerability: the lack of long-duration energy storage. The current roadmap, focusing on shorter-duration battery and pumped hydro storage, is deemed inadequate to ensure grid reliability during periods of low renewable generation.
UPSC Perspectives
Environmental
India's ambitious target of achieving 500 GW of non-fossil fuel capacity by 2030 hinges critically on effective energy storage. The challenge with solar and wind energy is their intermittency (variable generation dependent on weather). The article highlights the 'duck curve' phenomenon, where daytime solar generation meets peak demand, but the subsequent drop in solar output coincides with rising evening demand. Long-duration energy storage is essential to bridge this gap, storing excess daytime renewable energy for nighttime use, thereby reducing reliance on coal-fired power plants. The current strategy, relying on (BESS) and (PHES) with average discharge durations of 4-6 hours, may not be sufficient to handle prolonged periods (days or weeks) of low renewable generation, jeopardizing grid stability and the overall energy transition.
Economic
The economic implications of inadequate energy storage are multifaceted. A mismatch between renewable energy generation and demand can lead to curtailment, where excess electricity is wasted because it cannot be stored or transmitted. This undermines the financial viability of renewable energy projects. Furthermore, a reliance on fossil fuels to meet peak demand, especially during nighttime or periods of low renewable generation, increases operational costs and exposes the economy to volatile fossil fuel prices. Investing in diverse, long-duration storage technologies, such as compressed air energy storage or hydrogen storage, requires significant upfront capital. However, it is crucial for ensuring a reliable and cost-effective energy system in the long run. The (CEA) plays a vital role in planning and coordinating these infrastructure investments through initiatives like the .
Governance
Effective governance is critical for driving the transition towards a reliable, renewable-heavy energy system. The article points out that India's current roadmap, outlined in the , offers only a partial solution by focusing on shorter-duration storage. Policymakers must incentivize research, development, and deployment of long-duration storage technologies. This involves creating a conducive regulatory framework, establishing clear targets, and providing financial mechanisms, such as (VGF), to support nascent technologies. Furthermore, integrating energy storage into grid planning and operation requires coordination between central and state agencies, ensuring resource adequacy at both national and regional levels. The role of the (MNRE) and the (CERC) is crucial in formulating and implementing these policies.