* The power is restored: This allows you to access previously inaccessible areas, like the top floor of the power plant.
* You receive the TM for Thunder: A powerful Electric-type move that will be very useful in your journey.
* You unlock the way to Ecruteak City: The power plant was blocking the path, so now you can continue your adventure and face the challenges that await in the city.
* You can encounter a new Pokemon: The Electric-type Pokémon, Electabuzz, can be found in the restored power plant.
Overall, fixing the power plant is a significant event that opens up new areas and opportunities in your Pokémon HeartGold journey.