No new WorldGen, no new ores are added. This mod can be added to existing worlds and you are ready to go!

Powder Power allows you to create new alloys from existing Minecraft materials like Redstone, Lapis, Iron, Gold, Diamond, etc. There are new alloys to make that have stats beyond diamond. It lets you get the most out of what is already in Minecraft.

Powder Power provides more levels of materials that are created from existing vanilla materials - The Alchemist Hammer works with Redstone, Lapis, Iron, Gold, and Obsidian to craft powders. The Motor & Pestle is used on Ender Pearls, Diamond, Emerald, and Prismarine to make powder.