Well, yes and no. It's a lot easier to tackle the profile interoperabilty issues if you're the gateway between the ZigBee and non-ZigBee network. The energy providers don't quite have the same experience at being "user friendly" at a customer level.
Not that the company I work for really cares either way. Power companies are looking at smart grids, white good manufacturers are looking to include network functionality, and several people want to be the bridge between you and all of this. But as long as most people building ZigBee devices use our chips, we're happy.