H
- HCA—Host Control Area (electricity)
- HDD—Heating degree days a qualitative index used to reflect the demand for energy to heat a business (conservation)
- HERS—Home energy rating standard (conservation)
- HHI—Hirschman Herfindahl Index (markets)
- HID—high intensity discharge (electricity)
- hp—Horsepower (measurement)
- HTGR—high temperature gas cooled reactor (nuclear)
- HVAC—Heating, ventilation, and air conditioning (conservation)
- —High voltage alternating current (electricity)
- HVAR—Highly Valued Aquatic Resource
- HVDC—High Voltage Direct Current
Read more about this topic: List Of Energy Abbreviations