into [美 ˈɪntu, ˈɪn(t)ə, 英 ˈɪntʊ, ˈɪntə]介词into often appears as the second element of certain verb structures in English (break into, look into, settle into, etc). For translations, see the relevant verb entry (break, look, settle, etc). into is used in the structure verb + sb + into + -ING (to coax sb into doing, to provoke sb into doing, etc). For translations of these structures see the appropriate verb (coax, provoke, etc).
But once it gets going, fusion has the potential to generate enough energy to maintain its own heat, allowing us to draw off excess heat to turn into usable electricity.