Undergrounding cross-linked polyethylene (XLPE) transmission cables has long been one of the routing alternatives utilities investigate when siting new high-voltage transmission lines for regulatory approval. However, cost and feasibility constraints have tended to override the benefits of undergrounding on these types of projects within the U.S. — until now. The Southern California Edison (SCE) Tehachapi Renewable Transmission Project (TRTP) was approved as an overhead transmission ...

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