After the first sentence I thought '?' was onto something...but then I read the 3rd sentence and all was lost...
They of course (like all animals, as they are heterotrophs) obtain energy by the metabolic breakdown of the food they eat. As a carnivore, this is derived from other animals such as goats, sheep and other smaller mammalian prey.
Snow Leopard live in the Himalayas and they are big cats, they hunt goats. They are an endangered species and a most beautiful kind of animals. How they obtain energy is a wonder for they live in a very harsh environment. You can contribute to their welfare thru the wwf world wildlife fund. thank you.