How do we harness geothermal energy? What is the current supply left for this energy source?

Can the earthquakes occur anyplace where geothermal energy is produced and used? Or is it just certain areas where earthquakes are already common in the habitat? Like places where there are fault lines already.

House #1
>A 20 room mansion ( not including 8 bathrooms ) heated by natural gas.
>Add on a pool (and a pool house) and a separate guest house, all heated
>by gas. In one month this residence consumes more energy than the
>average American household does in a year. The average bill for
>electricity and natural gas runs over $2400. per month. In
>natural gas alone, this property consumes more than 20 times the
>national average for an American ho me. This house is not situated in a
>Northern or Midwestern ’snow belt’ area. It’s in the South.
>
>House #2
>Designed by an architecture professor at a leading national university.
>This house incorporates every ‘green’ feature current home construction
>can provide. The house
>is 4,000 square feet ( 4 bedrooms ) and is nestled on a high prairie in
>the American southwest. A central closet in the house holds geothermal
>heat-pumps drawing ground water through pipes sunk 300 feet into the
>ground. The water (usually 67 degrees F.) heats the house in the winter
>and cools it in the summer. The system uses no fossil fuels such as oil
>or natural gas and it consumes one-quarter electricity required for a
>conventional heating/cooling system. Rainwater from the roof is
>collected and funneled into a 25,000 gallon underground cistern.
>Wastewater from showers, sinks and toilets goes into underground
>purifying tanks and then into the cistern. The collected water then
>irrigates the land surrounding the house Surrounding flowers and shrubs
>native to the area enable the property to blend into the surrounding
>rural landscape.
>
>~~~~~
>HOUSE #1 is outside
>of Nashville , Tennessee ; it is the abode of the ‘environmentalist’ Al
>Gore.
>
>HOUSE #2 is on a ranch near
> Crawford , Texas ; it is the personal residence of the President of the
> United States , George W. Bush.
>
>What an ‘inconvenient truth’.