Ground energy transfer system and method

System (100; 200; 300) of energy transfer on the ground with a fluid energy transfer in motion to transfer heat from one part of relatively constant temperature of land and a building (2), the system comprising means (20 ; 120; 230; 231) for measuring energy, means (21) for invoicing, and a pipe (111; 203, 205), the arrangement being such that, in operation, is passed said fluid transfer energy through said pipe (111; 203, 205) for transferring heat between the earth and said building (2), said means (20; 120; 230, 231) of energy measurement determines the amount of heat transferred between said portion of relatively constant temperature and said building (2) based on a temperature difference between said fluid energy transfer in an inlet portion of said pipe (111; 203, 205) adjacent one end thereof and a outlet portion said pipe (111; 203, 205) adjacent the other end thereof, and said means (20; 120; 230, 231) for measuring energy stored representative electronic data of said amount of heat transferred, can be used the data to generate an invoice with said means (21) for invoicing for the quantity of heating and / or cooling of said building ( 2) provided by said energy transfer system ground.