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| Puna Geothermal Venture | |
|---|---|
| Name | Puna Geothermal Venture |
| Location | Puna, Hawaii County, Hawaii |
| Owner | Ormat Technologies (operator), previously Calpine Corporation, Hawaiian Electric Industries |
| Status | Inactive (post-2018 eruption) |
| Electrical capacity | ~38 MW (nameplate) |
| Commissioning | 1993 |
Puna Geothermal Venture
Puna Geothermal Venture is a geothermal power facility on the island of Hawaii (island), in the Puna district, that produced electricity from high‑temperature geothermal fluids. The plant, developed during the late 20th century and operated by several energy companies, supplied renewable baseload capacity to Hawaiian Electric Industries and contributed to Hawaii's renewable energy targets while being sited within an active volcanic and rift environment associated with Kīlauea and the Hawaiian hotspot.
The facility operated as a binary and flash geothermal station with an installed capacity near 38 megawatts, connecting to the Hawaiian Electric grid and serving customers on the island of Hawaii (island). The project was developed amid interactions among stakeholders including state agencies such as the Hawaii Department of Land and Natural Resources, tribal entities, research institutions like the US Geological Survey, and energy firms including Calpine Corporation and Ormat Technologies.
Initial exploration in the Puna district followed geological and geochemical surveys prompted by mid‑20th century studies of the Hawaiian volcanoes and interest from firms active in the geothermal industry. The site moved from exploration to commercial production in the late 1980s and early 1990s, culminating in commissioning in 1993. Ownership and operational roles transitioned through corporations such as Calpine Corporation, Ormat Technologies, and partnerships with local utilities like Hawaiian Electric Industries. Regulatory oversight involved the Hawaii Public Utilities Commission, the United States Department of Energy, and environmental review under state permitting authorities.
The reservoir exploited by the facility is hosted within the volcanic rocks of Kīlauea's rift zone on Hawaii (island), drawing heat from the Hawaiian hotspot mantle plume and shallow magmatic systems. Fluid characteristics included high temperatures, dissolved gases such as hydrogen sulfide, and brine chemistry influenced by water‑rock interaction in basalts and volcanic tephra. Subsurface structures included fracture networks related to rift faults mapped by researchers from institutions like the US Geological Survey and University of Hawaii. Resource assessment referenced analogs such as reservoirs at The Geysers and global fields studied by the International Renewable Energy Agency.
Technologies employed combined flash steam and binary cycle conversion, with equipment provided by manufacturers active in the geothermal sector, including firms like Ormat Technologies. Wells were drilled by contractors with rigs similar to those used in oil industry operations adapted for volcanic terrains; drilling and wellfield management followed practices recommended by the Geothermal Resources Council and monitored by the National Renewable Energy Laboratory. Power was transmitted via lines and substations interconnecting with Hawaiian Electric's distribution network, coordinating with grid operations and system balancing managed by regional planners and the Hawaii State Energy Office.
Environmental assessments addressed impacts to Puna ecosystems, groundwater resources overseen by the Hawaii Department of Health, air emissions regulated under state law, and cultural resource concerns raised by native Hawaiian organizations such as the Office of Hawaiian Affairs. Safety protocols targeted risks from hydrogen sulfide exposure, well blowouts, and induced seismicity, drawing on standards from the Occupational Safety and Health Administration and guidance from the United States Geological Survey. Litigation and public comment processes involved organizations including Earthjustice and local community groups, reflecting tensions common in geothermal developments worldwide, for example in debates similar to those around projects in Iceland, Indonesia, and New Zealand.
The 2018 eruption of Kīlauea and associated rift zone unrest produced lava flows, ground deformation, and fissure eruptions in the Lower Puna area. Volcanic activity damaged infrastructure and created hazards that prompted emergency action by state agencies including the Hawaii County Civil Defense and evacuation orders linked to USGS Hawaiian Volcano Observatory advisories. The plant ceased operations following concerns about well integrity, potential subsurface fluid pathways, and safety for personnel; operations remained suspended amid investigations by entities such as the Hawaii Department of Health, Hawaii Public Utilities Commission, and corporate operators. The event prompted study by scientists from institutions including the US Geological Survey and University of Hawaii at Manoa into interactions between geothermal operations and volcanic rift processes.
The facility contributed to local employment, tax revenues to Hawaii County, and power supply for the island's economy, affecting sectors from tourism related to Hawaii Volcanoes National Park to municipal services managed by county and state authorities. Post‑eruption shutdown led to debates involving unions such as the International Brotherhood of Electrical Workers, advocacy organizations, and policymakers in the Hawaii State Legislature over restoration, compensation, and future energy planning. Long‑term planning connects to statewide goals articulated by the Hawaii Clean Energy Initiative and collaborations with federal programs from the Department of Energy and research partners aiming to balance resilience, renewable generation, and cultural stewardship.
Category:Geothermal power stations in Hawaii Category:Kīlauea