Type of System

Gravity energy storage is a new technology that stores energy using gravity. It has the potential to be a cornerstone of sustainable energy systems, with its capacity for long-term energy storage and low maintenance.

Working Principle

Involves lifting a heavy mass (such as water, concrete blocks, or compressed earth blocks) during periods of excess energy generation and releasing it to generate electricity on demand

Types of Weights

Water, concrete blocks, compressed earth blocks

Advantages

• High efficiency
• Large storage capacity
• Low environmental impact
• Longevity

Limitations

• High initial cost
• Requires significant space
• Complexity

Applications

• Renewable energy integration
• Grid stabilization

Problem Addressed

It helps tackle the intermittency of solar and wind power, providing energy during periods without sunlight or wind, essential for a stable and reliable energy supply.

Renewable Energy Target

FOR EXAMPLE: Malaysia aims to increase its renewable energy capacity from two percent in 2018 to 20 percent by 2025.

Role of Gravity Storage

It provides a sustainable long-term option, complementing other storage systems and balancing supply and demand on the grid.

Comparison with Battery Storage

Battery storage is popular but faces challenges such as short lifespan, need for regular maintenance, and environmental harm from production and disposal.

In contrast, gravity storage offers durability and minimal maintenance.

Environmental Impact

Gravity storage avoids harmful chemical reactions, reducing environmental impact and disposal issues, an important consideration for sustainability.

Cost Effectiveness

It is more cost-effective for large-scale applications, with lower-level costs of energy and storage compared to battery storage.

CASE STUDY

A recent study found that both gravity and battery energy storage systems increased solar energy penetration by up to 7.26 percent. However, gravity storage outperforms in terms of lifetime costs and energy efficiency.

Reason for Efficiency

Gravity storage has a longer lifespan and higher discharge capabilities.

Batteries are limited by their depth of discharge, which is the percentage of total capacity discharged in use.

PRACTICE QUESTION

Q.Gravity energy storage systems have been proposed as a viable solution for large-scale energy storage, particularly in the context of renewable energy integration. Discuss the working principle of gravity energy storage and its potential role in enhancing energy security in India. (250 words)