RAPID/Geothermal/Transmission Siting & Interconnection/Hawaii

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Geothermal Transmission Siting & Interconnection in Hawaii

Regulatory Information Overviews

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At a Glance

Jurisdiction: Hawaii

Transmission Siting Agency: Hawaii Public Utilities Commission

Transmission Siting A developer must obtain Transmission Line Approval from the Hawaii Public Utilities Commission to interconnect a proposed renewable energy project to the existing grid.

Transmission Siting Threshold: No threshold provided

Public Utility Definition for Transmission Facility: In Hawaii, transmission facilities are covered by the definition of 'public utility.' Statutes define "public utility" in Hawaii Revised Statues 269-1 to include every person who may own, control, operate, or manage…any plant or equipment, or any part thereof, directly or indirectly for public use…for production, conveyance, transmission, delivery, or furnishing of light, power, heat, cold, water, gas, or oil. [1]

Public Utility Regulatory Authority Certification Transmission Threshold No threshold provided

Contacts/Agencies: Hawaii Public Utilities Commission

State Transmission Siting & Interconnection Process

To interconnect a proposed renewable energy project to the existing electric grid, a developer must obtain a Transmission Line Approval from the Hawaii PUC. If the total project costs are less than $2.5 million, the developer doesn’t need PUC approval. The process includes completion of an Interconnection Requirement Study and Power Purchase Agreement to determine necessary upgrades and payment of costs, both subject to PUC approval.

Local Transmission Siting & Interconnection Process

not available

Policies & Regulations


  1. Hawaii HRS 269-1, Definitions for Public Utilities (2014).

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