What is Energy Storage Technologies?
Historical Background
Key Points
7 points- 1.
Pumped-Hydro Storage (PHS): Most mature and widely used large-scale storage, uses gravitational potential energy.
- 2.
Battery Energy Storage Systems (BESS): Includes Lithium-ion, Flow batteries, Lead-acid, and Sodium-ion. Offers fast response times.
- 3.
Thermal Energy Storage (TES): Stores heat or cold for later use, often with concentrated solar power plants.
- 4.
Compressed Air Energy Storage (CAES): Stores air in underground caverns, then releases it to drive turbines.
- 5.
Hydrogen Storage: Converts electricity into hydrogen via electrolysis, which can be stored and later converted back to electricity or used as fuel.
- 6.
Benefits: Grid stabilization, peak shaving reducing demand during peak hours, ancillary services frequency regulation, voltage support, renewable energy firming, backup power.
- 7.
Challenges: High capital cost, limited lifespan for some battery types, raw material availability, safety concerns, energy density.
Visual Insights
Key Energy Storage Technologies for Grid Applications
This table compares major energy storage technologies relevant for grid applications in India, highlighting their principles, advantages, disadvantages, and UPSC relevance.
| Technology | Principle | Advantages | Disadvantages | UPSC Relevance |
|---|---|---|---|---|
| Pumped-Hydro Storage (PHS) | Uses gravitational potential energy of water stored at different elevations. | Most mature, longest duration, large scale, high efficiency (70-85%). | High upfront cost, geographic constraints, environmental impact. | GS3: Infrastructure, RE integration, oldest storage tech. |
| Lithium-ion Battery Energy Storage Systems (BESS) | Electrochemical storage using Li-ion cells. | Fast response, modular, high energy density, declining costs. | Limited lifespan, raw material dependency (Li, Co), safety concerns (thermal runaway). | GS3: PLI scheme, EV integration, grid stabilization, raw material geopolitics. |
| Flow Batteries (e.g., Vanadium Redox) | Electrolyte solutions stored in external tanks, pumped through a cell stack. | Long lifespan, independent power/energy scaling, non-flammable, deep discharge. | Lower energy density than Li-ion, complex system, higher capital cost per kWh. | GS3: Emerging tech, long-duration storage, industrial applications. |
| Green Hydrogen Storage | Electricity converts water to H2 via electrolysis; H2 stored, then converted back to electricity or used as fuel. | Long-duration storage, versatile (fuel, industrial feedstock), zero emissions. | Low round-trip efficiency, high capital cost, storage challenges (density, safety). | GS3: National Green Hydrogen Mission, future fuel, energy security. |
Recent Developments
5 developmentsLaunch of Production Linked Incentive (PLI) scheme for Advanced Chemistry Cell (ACC) Battery Storage with an outlay of ₹18,100 crore.
Increased R&D and pilot projects for Green Hydrogen production and storage.
Integration of grid-scale battery storage projects with renewable energy parks.
Development of hybrid renewable energy projects with integrated storage solutions.
Exploration of new technologies like gravity-based storage and supercapacitors.