This year marks the centennial of the first commercial electricity production from geothermal resources. A technology centuries in the making, thermal energy generated from the Earth was used for hot baths, greenhouses, and direct heat long before it was harnessed as a power source.

1. Energy:
A Glance Back
and
A Leap Forward
BY JOMI MATHEW

2. Geothermal Energy
THE HEAT DERIVED WITHIN THE SUB-
SURFACE OF THE EARTH. WATER AND/OR
STEAM CARRY THE GEOTHERMAL
ENERGY TO THE EARTH'S SURFACE.
DEPENDING ON ITS
CHARACTERISTICS, GEOTHERMAL
ENERGY CAN BE USED FOR HEATING AND
COOLING PURPOSES OR BE HARNESSED TO
GENERATE CLEAN ELECTRICITY.

5. Types of Geothermal
Heat Pump Systems
1. CLOSED-LOOP SYSTEMS
2. OPEN-LOOP SYSTEM
3. HYBRID SYSTEMS

8. Geothermal heat pumps
(GHPs)
Referred to as GeoExchange, earth-
coupled, ground-source, or water-
source heat pumps, have been in use
since the late 1940s. They use the
constant temperature of the earth as
the exchange medium instead of the
outside air temperature.

10. Advantages of Geo Energy
1. Lasting
2. Green
3. Savings
4. Harmless
5. Continual rate
6. Limitless

11. Disadvantagesof Geo
Energy
1. High Initial Cost
2. Requires wide location
3. Electrical energy is still essential