One of the things I wish I could buy would be a Bloom Energy 2kW natural gas fuel cell and a 50kWh LiON battery pack with whole house inverter.

The nice thing about the Bloom fuel cells is very efficient conversion of natural gas to electricity, the weakness is that it's response time is long (an hour or more to change its output by 50%). The nice thing about LiOn battery packs like the ones in Tesla cars are that they respond instantly to various power demands, can deliver massive amounts of power in a short period of time, and recharge again and again.

This combination would let me supply all of my house power under all circumstances using nothing but natural gas. That would take my house completely off the grid infrastructure for PG&E (although I would still be a gas customer).

C'mon Elon, make it possible! :-)