Amish dairy farms have discarded the metal milk bucket and three-legged stool in favor of an automated milking system. The Food and Drug Administration and the United States Department of Agriculture demand that certain guidelines be followed before milk can be marketed. Thus, power equipment and refrigerated bulk tanks are a necessity and permitted. However, the electricity needed to run a modern dairy must be produced, typically using gas or diesel generators. This may be more expensive than grid electricity, but lacks the degree of intrusion on Amish values and households that would result if fixed-line external power were used.