Hello All, I am new to this forum and like to introduce myself. My name is Joerg and my location is southern Alberta, Canada. I follow the geothermal issue, heat pumps etc. for probably +40 years. Our economy is energy, gas, oil, coal and heating cost where relatively low but that has changed. Not necessarily the cost for the actual energy, but all the ransom money one has to pay to be on the grid. What I mean is paying 1/3 for actual energy purchased and 2/3 for hook-up and line fees. This changes during the year, the more one uses, the lower the fees and vise versa. Plain-out, I don't like paying for something that I don't use, so I want to go of the NA grid. My facts: I have 70 acres irrigated where I live, a new house, full developed basement (~5000 sqft and workshop 60'x80', 18' eve). All heated with in-floor heating, second floor of our house has radiators and A/C. Two NA boilers, the house has 250,000 btu, the shop 125,000 btu. The house system has no problem keeping warm at -40° C/F, the shop run steady at that time last winter. I installed two grid-tied PV (solar power producing) arrays, one fixed south facing at 39° and one single axis tracking also facing south. Total production about 28,000 kWh/year. Both systems produce more then I use with purpose. Even so we don't get paid for overproduction, the higher production could be used to power a heat pump. Our climate is semi-arid cold winters with hot summers with lots of sunshine (~1400 kWh/KW/ year). Freezing down to 6-7'. NA cost per year is CAD3800-4000. Any system build should be paid within 10-15 years, meaning I got about $38-60,000 depending on the amortization I pick. Also, we assume the cost for energy is going to increase, so in general terms, the amortization should be quicker by general thinking. I received one quote when we build our house for geothermal combined with PV, but only for a portion of the energy usage, we would still need to have boilers and that quote was for $120,000 in 2010. One quote for the drilling of five wells, 100m (330') deep was received on April 28th for CAD117,000 plus room & board and meals for the crew. This excludes all loops, grout, connections, pump & switch gear/controls. So, by the time this would be installed I am looking at $160-200,000, $140,000 over budget. The five well scenario would include four wells with closed ground loops and one well in the center to determine the soil and water structure and to insert a senor wire with temperature sensors every 10m (32.8') to monitor the core temp. during operation. My plan is a geothermal well system of four wells to eliminate the purchase of NA (Natural Gas) for the future. This system would have solar collectors roof or ground installed and the energy generated and not immediately used would be moved in to the four wells to be stored, to be removed when needed and upgraded with electrical energy from our solar system through a heat pump. Now comes the calculation of the energy needed. If I convert peak demand of 375,000 btu to kWh, I arrive at 110 kWh or 31 tons. Does this make sense? This is what the max. output of my system in one hour has to be able to deliver, correct? This could happen only once in 10 years for 1 or 2 days, but nevertheless, it needs to be calculated to this term unless one is willing to suck it up and freeze, correct? If I take the potential 1400kWh from sunshine and use a 50% efficiency, I arrive at (theoretically) 700kWh that 1 m/2 (1.2 yd/2) could produce per year, 30 m/2 (36 yd/2) would produce 21,000kWh or 6,000 tons. I don't have my annual NA consumption available at the moment, but will submit this later. It would be great if I could get a general feedback for my basic thoughts. I noticed many threads start here after the project has started, I want to avoid this and get as much info, help and corrections before I start. I am waiting for more quotes from others, outside the oilfield to drill the holes, or, I could buy my own drill truck, drill the holes and then sell the unit, but I am not a driller, but a farmer. So lets see how this comes along. Joerg K.