Who owns the largest nuclear power plant in the world?

Can you tell me, who holds the distinction of owning the largest nuclear power plant in the world? It's quite a feat to have such a massive facility under one's control, managing the intricate balance of harnessing the immense power of nuclear energy while ensuring safety and sustainability. I'm curious to know which organization or country has undertaken this responsibility and how they've managed to build and maintain such a formidable facility.