If you can’t afford to convert your home to use all solar power but want to, perhaps you can at least power your iPhone with solar power.   TUAW writes:

The case is essentially a lithium ion battery pack with a solar panel that doubles as a flip cover for the iPhone. The construction is said to be leather, however I cannot imagine this being very kind to Mother Nature. There is also an LED status indicator that informs you of the capacity of the case’s battery pack when charging and discharging.

The instruction manual notes that an empty iPhone battery can be re-charged in 3 hours when the included Li-Ion battery pack is full. When the battery pack is empty you can set the case to direct charge mode and get your iPhone recharge on straight from the power of the Sun itself!