a large tank sitting in the middle of a field

A 500 gallon liquid propane (LP) gas tank. For those that don't know, folks that live in the country typically heat their homes with LP gas, as natural gas service is not available. The tank is usually provided free of charge, but, the customer is then locked in to the company providing the tank for LP gas purchases. So, if gas is $5.00 at say COOP (this provider) and $1.00 at other providers, the customer is obliged to purchase the $5.00 fuel.