A heat generation technology is an energy technology that describes how to combine heat generating units, heat generation processes, energy carriers and energy in a specific way.
A geothermal heat technology is a heat generation technology that describes how to combine geothermal heat units, geothermal heat transfer processes, energy carriers and energy in a specific way.
A solar thermal heat technology is a heat generation technology that describes how to combine solar heat units, solar thermal energy transformation processes, energy carriers and energy in a specific way.
An energy technology is a technology that describes how to combine energy transformation units, energy transformations, energy carriers and energy in a specific way.