Kerala Power Crisis: Rooftop Solar, Peak Demand And Storage
Source: Indian Express
GS III: Infrastructure – Energy
Overview
- News in Brief
- Key Issues Highlighted
- Government Measures & Grid Modernisation
- Significance for India’s Power Grid
Why in the News?
Kerala, despite becoming one of India’s leading states in rooftop solar adoption under the PM Surya Ghar Yojana, is witnessing power shortages and scheduled power cuts due to a mismatch between solar power generation and peak electricity demand.
News in Brief
- Kerala has over 2,500 MW of installed solar capacity, with rooftop solar contributing the majority of it.
- Peak electricity demand in Kerala occurs during 6 PM–11 PM, when solar generation is unavailable.
- The state is planning Battery Energy Storage Systems (BESS) to store daytime solar power for use during night-time demand.
Key Facts and Figures
- Kerala’s rooftop solar capacity has nearly doubled since 2023, registering a growth rate of close to 100%.
- The state now ranks fourth nationally in rooftop solar capacity, behind Gujarat, Maharashtra, and Rajasthan, having overtaken most southern states.
- By late 2024, Kerala had over 1.5 lakh rooftop solar systems installed, supplying a significant share of the state’s daytime electricity demand.
- Under PM Surya Ghar Yojana, Kerala has achieved one of the highest application-to-installation conversion rates in the country, supported by a dense network of registered local installers.
- Despite this success, rooftop solar penetration remains limited to a small fraction of the state’s total electricity consumers, indicating headroom for further growth alongside emerging structural constraints.
Background: How Kerala Became a Solar Leader
1. The Soura Scheme
Launched by KSEB in 2019-20, the Soura program was a pioneering model where KSEB financed rooftop installations, while households rented out roof space to the utility in exchange for a share of free power. This reduced upfront costs for consumers and built early public trust in solar technology — well before central schemes existed.
2. PM Surya Ghar: Muft Bijli Yojana
This central scheme offers subsidies for residential rooftop solar installations and aims to power one crore households nationally. Kerala’s pre-existing installer ecosystem, consumer awareness, and streamlined administrative processes allowed it to convert applications into installations faster than most states.
3. High Electricity Costs and Awareness
Kerala has traditionally had high domestic tariffs and a well-informed consumer base, both of which made rooftop solar an economically attractive proposition for households.
Key Issues Highlighted
- Mismatch Between Supply and Demand
- Over 60% of rooftop solar power is generated during the day, but electricity demand is highest in the evening after sunset, creating a supply gap.
- Dependence on Purchased Power
- Kerala generates domestically only a fraction (roughly 15 million units) of its 88+ million unit daily average demand.
- The state buys the remaining power from the national grid, but prices often spike to ₹10 per unit during peak hours.
- Reduced Hydropower Generation
- Traditionally dependent on hydel power, Kerala has faced reduced local generation due to weak monsoons and low reservoir levels.
- Inadequate Grid and Storage
- Excess solar power generated during the day cannot be stored due to inadequate battery storage.
- This leads to grid instability during daytime and electricity shortages during evening peak demand.
Government Measures & Grid Modernization
- Battery Energy Storage Systems (BESS)- Kerala is expanding battery storage to store surplus daytime solar power and supply it during peak evening demand.
- Grid Modernization– The Kerala State Electricity Board (KSEB) is upgrading distribution infrastructure and introducing smart grid technologies to improve grid stability and manage voltage fluctuations and prevent transformer blowouts.
- PM Surya Ghar Scheme– The state continues to promote rooftop solar installations under the PM Surya Ghar: Muft Bijli Yojana while implementing Time-of-Day (ToD) tariffs to encourage electricity use during off-peak hours and reduce pressure on the grid.
- PM Surya Ghar: Muft Bijli Yojana is a Central Government scheme launched in 2024 to promote rooftop solar installations in 1 crore households.
- It provides financial assistance for installing rooftop solar systems, enabling households to generate their own electricity, reduce power bills, and support India’s clean energy transition.
Significance for India’s Power Grid
- Intermittency Management
- As India scales its renewable capacity, Kerala’s reliance on power exchanges during solar and non-solar hours highlights the danger of depending on intermittent sources without complementary storage.
- Grid Modernisation Urgency
- Kerala’s challenges underscore the necessity for upgraded grid infrastructure, smart meters, and SCADA systems.
- SCADA (Supervisory Control and Data Acquisition): A system used to monitor, control, and automate electricity transmission and distribution networks in real time.
- The integration of pumped-storage hydroelectric projects and wave energy exploration are emerging as vital solutions.
- Kerala’s challenges underscore the necessity for upgraded grid infrastructure, smart meters, and SCADA systems.
- National Policy Adjustments
- Improve transmission networks to transfer electricity efficiently from power-surplus states to power-deficit regions like Kerala.
- Develop state-specific renewable energy strategies considering local constraints such as limited land availability and seasonal variations in power generation.
Significance for UPSC Aspirants
Relevance to GS Paper III (Environment and Infrastructure)
- Renewable energy transition, distributed vs. centralised generation models
- Grid integration challenges of variable renewable energy sources
- India’s climate commitments (Nationally Determined Contributions, net-zero target by 2070)
Relevance to GS Paper II (Governance)
- Centre-state coordination in scheme implementation (PM Surya Ghar)
- Role of state electricity regulatory commissions
- Federalism in energy pricing and subsidy design
Relevance to Economy/Prelims
- Concepts: net metering, gross metering, cross-subsidy, Renewable Purchase Obligation (RPO), Battery Energy Storage Systems (BESS), duck curve
- Institutions: KSEB, KSERC, MNRE, ANERT (Agency for New and Renewable Energy Research and Technology, Kerala).
Conclusion
- Kerala’s experience shows that increasing solar capacity alone cannot guarantee uninterrupted electricity.
- Achieving energy security requires a balanced approach combining renewable energy, battery storage, smart grids, and efficient demand management.
Key Takeaways
UPSC Prelims and Mains Practice Question
With reference to renewable energy integration in electricity grids, consider the following statements:
- Solar power generation is intermittent and depends on the availability of sunlight.
- Battery Energy Storage Systems (BESS) help store excess renewable energy and supply it during periods of high demand.
- Smart grids improve grid reliability by enabling better monitoring and management of electricity supply and demand.
Which of the statements given above is/are correct?
A. 1 only
B. 1 and 2 only
C. 2 and 3 only
D. 1, 2 and 3
Answer: D. 1, 2 and 3
Mains Practice Question
Q. “Renewable energy alone cannot ensure energy security unless supported by robust grid infrastructure and energy storage systems.” Discuss. (250 Words)
Daily Current Affairs: Click Here