Step 1: Understanding the Concept: Nuclear/atomic power plants use nuclear fission (mainly of Uranium) to generate electricity and form part of India's energy mix alongside thermal and hydel power.
Step 2: Examples: Two well-known nuclear power plants are the Tarapur Atomic Power Station (Maharashtra) — India's oldest commercial nuclear plant — and the Kudankulam Nuclear Power Plant (Tamil Nadu).
Step 3: Final Answer: \[ \boxed{\text{Tarapur (Maharashtra) and Kudankulam (Tamil Nadu)}} \]