Can you really not distinguish between sellers and buyers? Electric companies have no love for any particular means of generating power, they just want it cheap, and for most of them their primary concern in life is the NIMBY problem.
Electric companies, at least in some latitudes, are certainly worried about practical rooftop solar eating into their business, but for reasons that have nothing at all to do with love of fossil fuel.
As you say, electric companies just want to buy their energy cheap and sell it dear. Nothing inherently wrong with that. But they actually do have a love for a particular distribution model, if not a particular means of generating power. They are scared of the decentralization of power production, which smart grids coupled with residential rooftop solar installations represent. Koch Industries is the largest player in domestic energy production in the US. They have billions and billions of dollars invested in the centralized production of energy, so they are fucking scared of decentralization, and rightly so. Sadly, instead of embracing decentralization and adjusting their business model, they are successfully lobbying state legislatures and publicly-run utilities to create laws and regulations that make it damn near impossible to get a residential smart grid up and running.