Tesla is a car company. Everyone knows that when you talk about Tesla you're talking about cars like the electric Roadster, the mass-market Model 3, and the upcoming Tesla truck. So why are solar panels sometimes first thing you see when you visit Tesla's website?
Of course, Electricity is not a by-product that is readily available for usage. You can't simply plug into the ground and get free electricity; it has to be generated from energy sources. So, when we talk of electricity generation, we mean the various technologies that we employ to turn sundry energy into usable and consumable electric energy.