230 kV Underground HPFF River Crossing via HDD

Led engineering design for a 230 kV underground HPFF transmission line installed beneath a major river via horizontal directional drilling (HDD). The project addressed a critical reliability vulnerability by replacing overhead double-circuit lattice towers with underground circuits.

Key elements:
- 230 kV high pressure fluid filled cable design
- 6,800 ft horizontal directional drill crossing
- Two underground circuits sized to match ampacity of one overhead circuit
- Two breaker stations and one pumping plant design and construction
- Elimination of a common tower failure mode feeding a generation facility
- Coordination between overhead and underground interfaces

Published in T&D World Magazine as a case study in underground transmission design for reliability improvement.