The Ministry of Power issued a new notification on 23 December 2025 under the Energy Conservation Act, 2001. This notification updates the rules for distribution transformers in India. The amendment was made after consultation with the Bureau of Energy Efficiency.
All distribution transformers manufactured, sold, or purchased in India must now meet strict energy efficiency rules. Each transformer must pass type tests for load loss, no-load loss, and short-circuit impedance as per IS 2026 (Part 1):2011. BIS certification has become compulsory for every distribution transformer. The notification also extends existing star rating timelines from 2025 to 2026. A new Table 4 has been added. This table defines standard energy losses for distribution transformers up to 11 kV class. These limits apply from 1 January 2027 to 31 December 2029. The table covers ratings from 16 kVA to 2500 kVA and sets clear loss limits for 1-star to 5-star transformers at both 50% and 100% load.
For transformer ratings not listed, BIS-certified energy efficiency levels will apply. This amendment improves power efficiency, reduces energy waste, and strengthens transformer quality across India. It also supports national energy conservation goals and long-term power sector sustainability.