When was the Energy Conservation Act passed?

The correct option is 2001.

Explanation:
The Energy Conservation Act was passed by the Parliament of India in the year 2001 to promote the efficient use of energy and its conservation across the country.

Key aspects of the Energy Conservation Act, 2001 include:
1. Bureau of Energy Efficiency (BEE): The Act authorized the establishment of the BEE as a statutory body to implement policies and programs related to energy conservation.
2. Standards and Labeling: It laid the foundation for the star-rating system on household appliances (like air conditioners and refrigerators) to help consumers identify energy-efficient products.
3. Energy Conservation Building Codes (ECBC): It set guidelines for energy efficiency in commercial buildings.
4. Energy Audits: It mandated energy audits for large energy consumers to reduce wastage and optimize consumption.