Updates & Events
Task: EPRI High Voltage, Direct-Current (HVDC) Transmission Reference Book (The Olive Book)
Task Description: The EPRI Olive Book is a state-of-the-art guidebook and comprehensive source of technical information for designing, building, operating, and extending the life of HVDC transmission systems. The project team continuously updates the Olive Book.
Task: Underground Transmission Workstation—DC Ampacity
Task Description: This task aims to enhance the standalone Underground Transmission Workstation (UTW) DC ampacity calculation software tool for HVDC transmission cables. The calculation procedures are based on previous EPRI studies.
Task: Guide for High-Voltage Direct Current (HVDC) Transmission Cable Ratings
Task Description: This report provides calculation procedures for continuous ratings of buried land or submarine HVDC transmission cables.
Task: Off-Line Fault Location Systems for Transmission AC and DC Cables
Task Description: Off-line fault location is critical for determining location of a cable fault. This task provides results of a study in applying and demonstrating previously developed fault location technology for long HVDC cables to HVAC cables.
Task: Guide on HVAC and HVDC Array and Export Power Cables for Offshore Wind Farms
Task Description: This task is a multi-year effort addressing technical challenges for exporting a large amount of energy from offshore wind collectors to land-based grid connections. Both HVAC and HVDC technologies are investigated. The task evaluates best practices and the state of technology, from design to operation and maintenance.
Engagement Opportunities
| Meeting | Scheduled Date | Location | Information |
|---|---|---|---|
| Underground Transmission Task Force | February 19-21 (In Person) : February 26-29 (Virtual) | Charlotte, NC | Meeting Materials |
| EPRI R&D Project Update: Underground TransmissionMid-Year Webcast | June 11 : 1:00pm - 2:30pm ET | Webcast | Meeting Materials |
| Underground Transmission 2026 ARP Rollout #1 | June 18 : 1:00pm - 2:30pm ET | Webcast | Meeting Materials |
| Underground Transmission 2026 ARP Rollout #2 | August 6 : 1:00pm - 2:30pm ET | Webcast | Meeting Materials |
| Underground Transmission Task Force | August 19-22 (In Person) : August 26-29 (Virtual) | Charlotte, NC | Meeting Materials |
| EPRI Underground Transmission (Program 36) NewSupplemental Launch Webcast | October 15 : 1:00pm -2:00pm ET | Webcast | Meeting Materials |
| EPRI End of Year Webcast: P35.019, P36.008, P37.116High Voltage Direct Current | November 22, 11:00am - 12:00pm ET | Webcast | Meeting Information |
| Underground Transmission Task Force - March 2025 | March 10-13 (In Person) : March 17-20 (Virtual) | Charlotte, NC | RegisterHere |
| EPRI Kick Off Webcast: High Voltage Direct CurrentConverter Stations and FACTS | January 31 11:00am - 12:00pm ET | Webcast | Webcast Information |
2025 Planned Deliverables
| Product ID | Name | Type |
|---|---|---|
| TBD | EPRI High Voltage Direct Current (HVDC)Transmission Reference Book (The Olive Book) – 2025 Edition |
Report |
| TBD | Underground TransmissionWorkstation—DC Ampacity (UTW DC) V4.3 |
Software |
| TBD | Guide for High-Voltage Direct Current(HVDC) Transmission Cable Ratings - 2025 Update |
Report |
| TBD | Off-Line Fault Location Systems for Transmission AC andDC Transmission Cables |
Report |
| TBD | Guide on HVAC and HVDC Array and ExportPower Cables for Offshore Wind Farms - 2025 Edition |
Report |
2024 Deliverables
| Product ID | Name | Type |
|---|---|---|
| 3002030235 | EPRI High Voltage Direct Current (HVDC) Transmission Reference Book: 2024 Edition |
Report |
| 3002030107 | Underground Transmission Workstation (UTW) DC Module v5.0 |
Software |
| 3002029516 | Guide for High-Voltage Direct Current (HVDC) Transmission Cable Ratings |
Report |
| 3002029518 | EPRI Guide on HVAC and HVDC Array and Export Power Cables for Offshore Wind Farms – 2024 Edition |
Report |