"Geothermal power and heating technology" could mean two very different things:

Ground-source Heat Pumps (also called Geoexchange or Earth-Energy systems) are probably what this user is referring to. These systems use the relatively constant temperature (10-15C) of the ground just a few feet down as a heat source in winter or a heat sink in summer. Water or an antifreeze solution is circulated through pipes in the ground and a heat pump (think backwards refrigerator or air conditioner) 'upgrades' the stored heat. They can be applied at a building site or neighbourhood scale and while their capital costs are high, operating costs can be much lower than conventional heating so they pay off in the long run. These are often termed geothermal even though, technically, geothermal systems are quite different (see below). For more info on these systems, see: http://oee.nrcan.gc.ca/publications/infosource/pub/home/Heating_and_Cooling_with_a_Heat_Pump_Section4.cfm

True geothermal is the the use of the deeper, higher-temperature core heat of the earth to provide heat or generate power. Usually these projects happen in areas of high geothermal activity (hot springs, volcanoes, etc). This is a more industrial-scale system and is possible, though probably unrealistic in Vancouver. Elsewhere in B.C. though, geothermal could play a role in supplying power to the grid.

I think Geothermal heating uses the heat from the earth's core not solar. What ever it is great!