Hawaii
New Report Illuminates Geothermal Cooling Potential in Hawaii – CleanTechnica
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University of Hawaii at Manoa and Lawrence Berkeley National Laboratory Teamed up To Analyze Feasibility of Geothermal Cooling Technologies
By Justin Daugherty, NLR
In areas with geologically recent volcanic activity and ample underground water flow, like the Hawaiian Islands, geothermal energy technologies present options to augment the electric grid.
To investigate building cooling and energy efficiency options, the University of Hawaii at Manoa’s Hawaii Groundwater and Geothermal Resources Center collaborated with scientists at Lawrence Berkeley National Laboratory through the U.S. Department of Energy’s Energy Technology Innovation Partnership Project (ETIPP).
Managed by the National Laboratory of the Rockies (NLR), formerly known as NREL, ETIPP supports remote, coastal, and island communities with technical assistance and energy planning to help them build more reliable and affordable energy systems. Communities apply for up to 24 months of technical assistance, and those communities drive the scopes and focuses of their energy projects.
University of Hawaii at Manoa joined the program in 2022 with a desire to explore geothermal options, and a new report from this project details the feasibility of developing shallow ground heat exchangers (GHEs) across Oahu and at a specific site on the island for cooling.
Geothermal heat pumps take advantage of relatively constant temperatures just under the earth’s surface, using GHEs to exchange heat with the earth. Through a system of looping pipes in the shallow ground, GHEs can move heat from a warm place to a cooler place, like how a refrigerator functions.
“High-temperature geothermal, which requires deep drilling, is required to produce electricity, but low-temperature geothermal such as GHEs, which can be accessed much nearer the ground surface, can be used for building heating and cooling, greatly lessening loads on the electric grid,” said Lawrence Berkeley National Laboratory’s Christine Doughty, staff scientist.
“I believe both types of geothermal have potential to be an asset to Hawaii,” added Nicole Lautze, founder and director of the Hawaii Groundwater and Geothermal Resources Center.
Determining Geothermal Cooling Favorability in Hawaii
In open-loop geothermal systems, wells are drilled to extract and inject groundwater, allowing the movement of thermal heat to and from the earth. These GHEs use cooler ground water from outside the system for the cooling process and expel the warmer water afterward.
In contrast, closed-loop GHE systems continually circulate a heat-transfer solution through pipes, which transfers heat to and from the ground via thermal conduction. Groundwater needs to have temperatures that are low enough to effectively cool buildings, and groundwater flow in a GHE system works to remove built-up heat.
Hawaii has far greater needs for cooling than for heating—meaning that GHEs would add heat to the subsurface and cause the systems to not function as desired. That is where groundwater comes in: It replaces heated water from the boreholes and maintains the functionality of the GHE system. Sufficient groundwater flow, then, is essential to the considerations for GHE deployment. GHE systems may not be deployed in areas with restricted watersheds or where there is subsurface production of freshwater. Therefore, closed-loop systems may be a more reasonable option in some locations.
Numerous factors help determine whether a community or business may consider GHEs. Areas with older homes may lack efficient energy systems, and some organizations, like schools or government buildings, may prioritize more adaptive heating and cooling. Cultural considerations are also very important, and a new NLR report incorporates Hawaii communities’ perspectives on geothermal.
Economic factors are another big consideration, with the expense of deploying a system versus energy savings playing into overall cost. Modeling revealed that electricity and energy transfer demand decreased, and such reductions contributed to cost savings. Longer loan terms may help ease deployment expenses for geothermal systems.
ETIPP researchers factored the above parameters into their analysis to develop favorability maps for closed-loop and open-loop GHE systems. They used specific geographic information system layers with 11 attributes—including elevation, geology, and soil permeability—to develop an overall favorability map for GHEs on Oahu.
For the site-specific feasibility analysis at the University of Hawaii at Manoa’s Stan Sheriff Center, researchers used a hydrogeologic model to analyze groundwater flow of a closed-loop system at the site. Restrictions on water quality—mandating that groundwater must be left in its natural state—diminished the available area for GHE system deployment across the island, while many coastal areas showed high favorability. Overlays showing potential customers and restricted areas sharpened the maps.
Geothermal Cooling Potential at University of Hawaii at Manoa
From the island-wide analysis, ETIPP analysis homed in and found that the Stan Sheriff Center at the University of Hawaii at Manoa, a building with a high cooling load in an area with lots of open space surrounding it, could make a good candidate for site-specific analysis of GHE technology.
Researchers used a hydrogeologic model to analyze a potential closed-loop system at the site. They modeled groundwater and heat flow, analyzed subsurface heat flow, and completed a techno-economic analysis.
Analysis without groundwater flow showed that the GHE system may operate normally in the first year, but heat buildup would increase water temperatures significantly after that, and without groundwater to sweep heat away, there would be increased chiller demand in years two through six. Modeling that incorporated groundwater flow—with similar conditions as the Stan Sheriff Center—showed that heat would be effectively swept away from the borefield, which would enable successful GHE operation for at least 10 years. Thus, including groundwater in analysis and planning—coupled with low interest loan rates and high capital investment—may provide economic benefits to the university.
Cold seawater may be an option for cooling-source systems, the analysis concluded, and such a system already operates at the Natural Energy Laboratory of Hawaii. The report authors encouraged further study.
As in Hawaii, ETIPP continues to help communities explore geothermal and other technologies to help meet their energy needs through in-depth, collaborative investigation of potential solutions.
“This ETIPP project established a strong collaboration with LBNL and the foundation for what I hope is additional grant funding to explore the potential of GHEs on the UHM campus and across the state to cool buildings and reduce load on Hawaii’s grid,” Lautze said.
The U.S. Department of Energy’s Energy Technology Innovation Partnership Project (ETIPP) is a community-led technical support program for coastal, remote, and island communities to access unique solutions and increase energy reliability. By uniting federal agencies, national laboratories, regional organizations, and community stakeholders, ETIPP provides tailored technical support to help communities achieve affordable, reliable solutions to their energy system challenges. This collaborative model leverages the combined expertise and resources of its partners to deliver comprehensive, practical solutions that align with local needs. Learn more about ETIPP.
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Hawaii
Waianae encampment deadline extended amid pushback from lawmaker, community
HONOLULU (HawaiiNewsNow) – A state senator is challenging the Department of Land and Natural Resources’ (DLNR) decision to extend the deadline for the Puuhonua O Waianae (POW) encampment at Waianae Boat Harbor.
It comes as state and community leaders continue efforts to relocate residents to a permanent site.
The deadline was originally set for the end of June and has been pushed to Oct. 16.
State Sen. Samantha DeCorte said the extension marks the third delay in the relocation process since the original notice to vacate was issued last year. The initial deadline was Nov. 27, 2025, followed by extensions to April 30 and June 25 before the most recent extension.
DeCorte criticized the repeated delays during a press conference on Saturday.
“We are calling on DLNR Acting Chair Ryan Kanakaole, members of Puuhonua O Waianae, and the governor’s office to do what they said they would do. Complete the transition, honor the commitment, and bring this process to a close. After 20 years, another extension is not the solution,” DeCorte said.
She added concerns remain around public safety near the harbor, including reports of vandalism involving fishing equipment and conditions she says affect families and students traveling through the area.
“Fishermen have dealt with vandalism (and) theft of their equipment. Public safety concerns have persisted, and kids have to walk past unsafe conditions just to get to school.”
DLNR said the extension is intended to provide additional time for the relocation of the POW community to a nearly 20-acre site in Waianae Valley, while construction continues at the mauka housing development.
Kanakaole said in an email sent to DeCorte Friday that POW requested a deadline extension to vacate by the end of November, and the department, along with the governor’s office, reached an agreement on the October move-out deadline.
“DLNR, POW, and the Governor’s Office worked through what remains to be completed and established a reasonable timeline tied to actual relocation, cleanup, and closure activities and to provide for the most orderly and voluntary transition, which will ultimately lead to a solution that will last,” Kanakaole’s email said in part.
He added that more than 100 people remain at the site and POW leaders said that number should substantially reduce over the next several weeks, “potentially by nearly half within the next month.”
Read Kanakaole’s full email to DeCorte here.
The agency said it is coordinating with community leaders to ensure residents can relocate safely and to support cleanup and transition efforts at the harbor.
The relocation site has been part of a long-term plan tied to the late community leader Twinkle Borge, who envisioned moving families from the harbor into permanent housing.
Community leaders with Puuhonua O Waianae said the process remains complex and cannot be completed immediately.
Kala Paishon, a community leader with the encampment, said some residents are still unable to move because housing units at the new site are not yet complete. He also said limited transportation and volunteer support make moving difficult for some families.
“We do have some people that volunteer their time to help our people move. We’re limited on our vehicles, but we do what we got to do to move the people up there,” Paishon said.
He added that many residents have deep ties to the harbor after years of living there.
“Some people have been here 10-plus years,” Paishon said. “This is the memory they have, and this is where they felt like home.”
Paishon also said crews are working to gradually transition residents while maintaining cleanup efforts at the site.
“We’re making sure everybody moves up there safely… at the same time, we’re still cleaning up our opala down here.”
DLNR said it continues to work with community leaders and the governor’s office to move the relocation process forward in the coming months.
Copyright 2026 Hawaii News Now. All rights reserved.
Hawaii
Office of Hawaiian Affairs Responds to Senate Bill Involving Pōhakuloa – Big Island Video News
(BIVN) – The Office of Hawaiian Affairs (OHA) says it is in alignment with provisions in the Fiscal Year 2027 National Defense Authorization Act dealing with military-leased lands in Hawaiʻi, including the Pōhakuloa Training Area.
In a news release, OHA said it is encouraged by the bill’s “clear movement away from condemnation and toward negotiated solutions” for the approximately 19,700 acres of state lands at Pōhakuloa, and 450 acres at Kahuku. “The process outlined is consistent with OHA’s long-standing position opposing condemnation – whether forcible or ‘friendly’ – and insisting that lands held in public trust remain in the public trust and continue benefiting Native Hawaiians and future generations of Hawaiʻi’s people.”
The U.S. Senate Armed Services Committee recently passed the Fiscal Year 2027 National Defense Authorization Act, or NDAA. The bill is expected to advance to the full United States Senate for consideration by the end of July 2026, OHA says.
In a June 12th news release, U.S. Senator Mazie Hirono (D, Hawaiʻi) said she voted against the NDAA. Hirono is a senior member of the Senate Armed Services Committee (SASC) and Ranking Member of the Readiness and Management Support Subcommittee.
“I’m proud to have secured numerous provisions in the Senate’s FY27 NDAA that invest in military readiness, Hawaii, the Indo-Pacific Region, and our servicemembers and their families, while also holding the Army accountable on the military training land lease negotiations,” Hirono stated at the time. “However, I could not in good conscience vote to advance a bill that paves the way for an up to 40% increase in year-over-year Department of Defense spending, especially as this administration wages an illegal war in Iran with no plan or end in sight.”
Hirono said the bill “directs the Secretary of the Army to seek from the State of Hawaii, on terms acceptable to both the Army and the State, a renewal of expiring training land leases. As part of this, requires the Army to expeditiously resubmit their Environmental Impact Statements (EISs) for the leased lands and address deficiencies identified by the Hawaii Board of Land and Natural Resources.”
OHA noted Section 2864 of the NDAA also requires a report to Congress on the steps and proposals taken to advance lease renewals, within 60 days from the NDAA’s enactment.
“The Senate Armed Services Committee’s action reflects meaningful progress in acknowledging Hawaiʻi’s unique legal and cultural context,” stated OHA chair Kaialiʻi Kahele. “The removal of condemnation as an option and the requirement for renewed environmental review are consistent with what OHA has long advocated – that these lands must not be permanently alienated and that Hawaiʻi’s concerns must be fully addressed in good faith. Congress appears willing to respect Hawaiʻi’s laws and institutions. The opportunity before us now is to fully embrace the responsibilities and authorities those laws entrust to us. OHA will continue to ensure Native Hawaiian rights and public trust responsibilities remain central to any future decisions.”
OHA has been holding high-level meetings in Washington, D.C. concerning the military lease renewals.

OHA says it is also actively moving forward with a comprehensive Ka Paʻakai Analysis for Pōhakuloa Training Area. “The Board of Trustees has already approved a Permitted Interaction Group allocation of $60,000 to support this work, and OHA is finalizing a memorandum of understanding with DLNR to complete the work,” the Office stated. The analysis “will help create a more complete record of the cultural, historical, and community connections to these lands, providing decision makers with information necessary to evaluate potential impacts, identify appropriate protections, and fulfill their responsibilities under Hawaiʻi law.”
From the OHA news release:
OHA also notes that the NDAA contemplates the pursuit of future lease arrangements pursuant to Section 2667 of Title 10, United States Code. As discussions continue regarding potential lease terms, community benefit commitments, land-back and lease-back models, and other components of any future agreement, OHA believes those arrangements must remain consistent with Hawaiʻi’s environmental laws and public trust obligations. Any benefits derived from renewed use of these lands should reinforce the purposes of the public trust, protect traditional and customary Native Hawaiian practices, honor the history and significance of these lands, and preserve the value they were intended to provide for Native Hawaiian beneficiaries and future generations of Hawaiʻi’s people.
Hawaii
Hawaii County Surf Forecast for June 20, 2026 | Big Island Now
Forecast for Big Island Windward and Southeast
| Shores | Tonight | Saturday | ||
|---|---|---|---|---|
| Surf | Surf | |||
| PM | AM | AM | PM | |
| North Facing | 0-2 | 0-2 | 0-2 | 0-2 |
| East Facing | 1-3 | 1-3 | 1-3 | 1-3 |
| South Facing | 4-6 | 3-5 | 4-6 | 5-7 |
| Weather | Sunny until 6 PM, then partly cloudy. Scattered showers. |
|||||
|---|---|---|---|---|---|---|
| Low Temperature | In the lower 70s. | |||||
| Winds | Northeast winds 5 to 10 mph, becoming northwest after midnight. |
|||||
|
||||||
| Weather | Mostly sunny. Scattered showers. | |||||
|---|---|---|---|---|---|---|
| High Temperature | In the mid 80s. | |||||
| Winds | Northeast winds 5 to 10 mph. | |||||
|
||||||
| Sunrise | 5:42 AM HST. | |||||
| Sunset | 7:02 PM HST. | |||||
Forecast for Big Island Leeward
| Shores | Tonight | Saturday | ||
|---|---|---|---|---|
| Surf | Surf | |||
| PM | AM | AM | PM | |
| West Facing | 2-4 | 2-4 | 2-4 | 2-4 |
| South Facing | 4-6 | 3-5 | 3-5 | 4-6 |
| Weather | Mostly sunny until 6 PM, then mostly clear. Isolated showers. |
||||||||
|---|---|---|---|---|---|---|---|---|---|
| Low Temperature | In the upper 60s. | ||||||||
| Winds | Northwest winds around 5 mph, becoming southeast in the evening, then becoming light and variable after midnight. |
||||||||
|
|||||||||
| Weather | Sunny. Isolated showers. | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| High Temperature | In the upper 80s. | ||||||||
| Winds | West winds around 5 mph. | ||||||||
|
|||||||||
| Sunrise | 5:46 AM HST. | ||||||||
| Sunset | 7:06 PM HST. | ||||||||
A small, medium period south swell will continue to steadily fade into Saturday, allowing surf along south and west-facing shores to drop a notch. A series of small, medium to long period south and southeast swells will fill in Saturday into the first half of next week, which will boost surf heights back near seasonal averages.
Tiny surf will prevail along north-facing shores through most of the coming week as only some limited short-period energy reaches the islands from the north. Trade winds remain lighter than normal through the weekend, keeping surf along east-facing shores below average. East shore surf will begin to trend up early next week as trade winds increase upstream and across the region.
NORTH EAST
am
pm
Surf: Minimal (ankle high or less) surf.
Conditions: Semi choppy with ESE winds 5-10mph in the morning increasing to 10-15mph in the afternoon.
NORTH WEST
am
pm
Surf: Minimal (ankle high or less) surf.
Conditions: Clean in the morning with ESE winds less than 5mph. Bumpy/semi bumpy conditions for the afternoon with the winds shifting W 5-10mph.
WEST
am
pm
Surf: Minimal (ankle high or less) surf.
Conditions: Light sideshore texture in the morning with NNW winds 5-10mph. Bumpy/semi bumpy conditions for the afternoon with the winds shifting to the WNW.
SOUTH EAST
am
pm
Surf: Minimal (ankle high or less) surf.
Conditions: Sideshore texture/chop with NE winds 10-15mph.
Data Courtesy of NOAA.gov and SwellInfo.com
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