| Abbreviation | Definition |
|---|---|
| HOPE | Help Offer Positive Energy |
| HPCN | Home Performance Contractor Network |
| HPEM | High Performance Energy Management |
| HPP | Hydro Hower Plant |
| HREA | Hawaii Renewable Energy Alliance |
| HREE | Heart Rate Energy Expenditure |
| HREI | Healthcare Renewable Energy Initiative |
| HREI | Hybrid renewable energy integration |
| HSEA | Hawaii Solar Energy Association |
| HSEE | Health and Safety Environment Energy |
| HSEE | Health Safety Environment and Energy |
| HSEO | Hawaii State Energy Office |
| HSSS | Hydraulic Safety Shut down System |
| HSTE | Higher School of Technology and Energy |
| HTEC | Hydrogen Technology and Energy Corporation |
| HTGRs | High Temperature Gas Reactors |
| HUGE | Hydrogen Utilization Green Energy |
| HUHEPL | Harvard University High Energy Physics Laboratory |
| HVCC | Harness Value Captured CO2 |
| HVDC | High Voltage Direct Current |