With reference to the Tamil Nadu Battery Energy Storage Systems (BESS) Policy, consider the following statements: 1. The BESS systems must maintain a minimum annual availability of 95%. 2. Solar projects of 1 MW and above must install BESS capacity of at least 10% with a four-hour discharge duration. 3. The policy targets a storage capacity of 50 GWh by the year 2029. Which of the statements given above is/are correct?

Tamil Nadu targets 10 GWh battery storage by 2029 under new BESS Policy

GS3Economy · S&T · Environment · Security· Infrastructure (energy, ports, roads, railways)· Prelims + Mains· 3 November 2026

Renewable energy integration and grid stability: a key GS3 topic on energy security.

Why in news

The Tamil Nadu government launched the Battery Energy Storage Systems (BESS) Policy, 2026, to build 10 GWh of storage capacity by 2029 to address grid integration issues.

Background

The policy mandates that solar projects of 1 MW and above must install BESS capacity of at least 10% with a four-hour discharge duration. Tamil Nadu Power Distribution Corporation Limited will procure 2,500 MW / 10,000 MWh in its first phase through competitive bidding.

Facts for Prelims

FactTarget capacity: 10 gigawatt-hours (GWh) by 2029
FactMandatory BESS capacity: At least 10% for solar projects of 1 MW and above
FactRequired discharge duration: Four hours
FactAvailability standard: Minimum 95% annual availability
FactPeak demand windows: March 1 to June 30 and September 1 to October 31

Prelims practice question

With reference to the Tamil Nadu Battery Energy Storage Systems (BESS) Policy, consider the following statements:

The BESS systems must maintain a minimum annual availability of 95%.
Solar projects of 1 MW and above must install BESS capacity of at least 10% with a four-hour discharge duration.
The policy targets a storage capacity of 50 GWh by the year 2029.

Which of the statements given above is/are correct?

(a)2 only
(b)3 only
(c)1 and 2 only
(d)1 and 3 only

Show answer

Answer: (c) 1 and 2 only — Statements 1 and 2 are correct. Statement 3 is incorrect: The target capacity is 10 GWh by 2029.

For Mains

Q. Discuss how Battery Energy Storage Systems (BESS) can mitigate the intermittency of renewable energy and ensure grid stability in India's power sector.

Dimensions to cover in your answer

Grid stability: Addressing evening power deficits by capturing surplus solar energy for peak demand hours
Cybersecurity: Mandating indigenous Energy Management System (EMS) platforms to protect critical infrastructure
Fiscal incentives: Using transmission and wheeling charge waivers to de-risk private investment in storage

Keywords: Grid Integration · Energy Security · Intermittency · Renewable Energy · BESS Policy · Energy Management System

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