No doubt wind power but no idea how much power those windmills on Amish farms can put out. Better be efficient Class D amps and efficient speakers to match!
Here is a 100% true story. I used to have many Amish kids come into the Radio Shack I managed in the heart of Amish country. They would buy car stereos and Minimus 7s. Very high end for Amish kids! They would hook them up to car batteries in the barn when the folks were not around. Rebellious Amish kids! I think they listened mostly to Death Metal. I did make this one part up. Not much Death Metal out there at the time. Another few years maybe. I have no idea what kind of music they listened to.
Here is a 100% true story. I used to have many Amish kids come into the Radio Shack I managed in the heart of Amish country. They would buy car stereos and Minimus 7s. Very high end for Amish kids! They would hook them up to car batteries in the barn when the folks were not around. Rebellious Amish kids! I think they listened mostly to Death Metal. I did make this one part up. Not much Death Metal out there at the time. Another few years maybe. I have no idea what kind of music they listened to.