at 0.1$/kWh you can buy 2 500 000 kWh at 250 000$ or enough for running those BFL mini rigs 50 years. I bet the solar panels is dead way before 2062.
If you promise use wall power instead of solar your project actually looks good.
Solar sucks, but I think he is looking at wind power, not solar. And, an additional revenue stream from selling the wind power to the grid.