Elon also said the car market is huge, very huge. So Tesla and Apple are just small compared to others.
If you talk about car competition you should take a look at the big players. Volvo for example is already running tests with complete autonomous cars (100 people driving them). And almost all other brands have self driving cars and electric cars.
So I don't think Apple as a competitor has anything to do with it. Apple is just too small in this industry (for now).
And as for Apple becoming a power company: it's still unclear what Apple is going to do with it in the future. For now they are just selling the excess power they create with the solar panels on the campus and other places.
Yes, but they'll probably tend to be competing for the same, much smaller, portion of it.
Source: http://fortune.com/2016/02/14/apple-mobile-profit-2015/