That's $10714 per customer, assuming the $3 bil is the cost ceiling.
Interesting. Checking my budget plan electric bill, that's about 20 years worth of power for my area, which, like many places in this country, has primarily a coal-nuclear generation mix. Factor in things like maintenance/replacement costs and reliability concerns (the sun doesn't always shine, even in the desert, since it gets dark at night there, too), then I'm wondering if the thing is really practical given the (proven) alternatives.