{ "canonicalUrl": "https://hawaii-tech-week-project-record.vercel.app/stories/c14-13", "liveUrls": { "Beehiiv / newsletter": "", "LinkedIn": "", "Instagram": "", "Threads": "", "X": "", "TikTok": "", "YouTube": "", "Facebook": "", "Bluesky": "" }, "audience": "People interested in Hawaiʻi, technology, invention, culture, public history, and accountable storytelling.", "keywords": [ "hawaiʻi", "powered", "barge", "temperature", "difference", "ocean", "august", "floating" ], "platforms": { "Beehiiv / newsletter": { "headline": "Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean", "body": "On August 2, 1979, a barge floating off Keāhole Point generated electricity from a resource that surrounds Hawaiʻi in layers.\n\nMini-OTEC used the temperature difference between them to run a power cycle.\n\nWarm surface seawater passes through a heat exchanger and boils a working fluid with a lower boiling point—in Mini-OTEC’s closed cycle, ammonia. Pumps keep immense volumes of warm and cold water moving through the system.\n\nHawaiʻi eventually tested both approaches, but Mini-OTEC’s world-first claim belongs to the closed-cycle system.\n\nThe temperature difference was only about 21 degrees Celsius. Mini-OTEC therefore had little thermodynamic margin to waste. Small inefficiencies in pumps, heat transfer, pipe friction, turbine performance and auxiliary equipment could consume a large share of the output.\n\nWater moving through hundreds of meters of pipe experiences resistance. Pumps require electricity. Heat-exchanger surfaces must transfer energy efficiently while exposed to saltwater, corrosion and biological growth.\n\nMini-OTEC sat about 2.2 kilometers offshore. Its average seawater temperature difference was approximately 21 degrees Celsius. Technical reporting describes roughly 50 kilowatts of gross generation. Contemporary and participant accounts indicate that pumps and other equipment consumed roughly 35 to 40 kilowatts, leaving something like 10 to 15 kilowatts net depending on operating conditions.\n\nTrimble reports that Mini-OTEC produced first power on August 2 and that the program concluded November 18, 1979. Those dates keep three different claims separate: first net generation, sustained operation and commercial service. Mini-OTEC demonstrated the first two at experimental scale.\n\nThe difference between gross and net output is the story. Scaling the loop means building, deploying and maintaining enormous seawater pipes and heat exchangers in a corrosive marine environment while controlling biological fouling, protecting marine systems and financing infrastructure whose energy density is low.\n\nGross output is what the generator produces. Net output is what remains after the plant supplies its own pumps, controls and auxiliaries.\n\nMini-OTEC’s cold-water intake descended roughly 2,000 feet. Makai Ocean Engineering, a project participant, says its polyethylene pipe also served as part of the barge’s mooring design.\n\nThe pipe was part of the experiment, not a delivery tube added after the power plant was finished. Owens and Trimble describe a pipe about 0.61 meters—two feet—in diameter reaching approximately 670 meters, or about 2,200 feet, into deep water. Their abstract says it formed part of a single-point tension-leg mooring system.\n\nMakai’s participant history says it designed and oversaw construction of the cold-water pipe, mooring and platform. NELHA’s profile says Makai later designed four deep-water pipelines for the site.\n\nSomeone fabricated and joined the polyethylene pipe, installed heat exchangers and pumps, instrumented the cycle, maintained the ammonia system, crewed and supplied the barge, inspected connections, watched weather and sea conditions, logged output and repaired failures. Until project files and oral histories identify them, the article must treat “the partnership built” as a placeholder for a workforce—not an adequate history.\n\nThe surface supplied warm water while the steep offshore bathymetry placed cold deep water within the reach of pipes and a moored experiment.\n\nAn OTEC design that works at Keāhole does not automatically work at a coast where deep water is far offshore, the surface is cooler, the seabed complicates installation, storms differ, or grid and financing conditions change.\n\nlisting them is not evidence that Mini-OTEC caused a documented ecological harm.\n\nThe article must not infer “no impact” from the absence of a cited controversy, or infer harm from the existence of an intake.\n\nAfter Mini-OTEC, the United States spent far more pursuing larger demonstrations.\n\nHawaiʻi’s energy vulnerability, HNEI’s creation in 1974, federal OTEC programs and corporate participation formed the policy environment in which Mini-OTEC became possible. The final finance history must show appropriations, in-kind support, contracts and ownership rather than narrating “the energy crisis funded it” as an unsupported shortcut.\n\nMini-OTEC proved net power at sea.\n\nNELHA reports deep seawater pipelines reaching as far as 3,000 feet and an 870-acre Hawaiʻi Ocean Science and Technology Park supporting energy tests and commercial users.\n\nMakai developed seawater air conditioning and pipeline engineering They are not all descendants of Mini-OTEC in the strict causal sense.\n\nA prototype can succeed technically and still reveal why an industry does not yet exist.\n\nMini-OTEC reverses the gaze.\n\nSo do the pump load, missing commercial fleet, later pipelines, environmental measurements and businesses using cold deep water for purposes the barge was not built to serve.", "cta": "Read the complete edition and Source Desk: https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13" }, "LinkedIn": { "post": "In 1979, a barge off Hawaiʻi became the first at-sea closed-cycle OTEC plant to produce net electricity.\n\nMini-OTEC used warm surface seawater to boil ammonia. Cold water pumped from roughly 2,000 feet below the ocean condensed the ammonia so the cycle could repeat.\n\nThe unseen workforce also included pipe crews, barge crews, technicians, divers and maintainers.\n\nKeāhole’s later deep-water pipelines, OTEC tests, seawater air conditioning, aquaculture, algae businesses and environmental monitoring form a shared infrastructure ecosystem. They are documented continuations of the test platform—not proof that Mini-OTEC caused every later enterprise.\n\nFull article + gross-to-net diagram: [CANONICAL URL]", "firstComment": "**First comment:** The numbers vary by operating condition and retrospective. The full piece separates gross generation from parasitic load and does not convert a 10–15 kW net demonstration into a claim of commercial viability.\n\nOne small thermal gradient. Warm water boils ammonia in a closed loop. Ammonia vapor drives a turbine/generator. Deep cold water condenses the vapor. Mini-OTEC generated ~50 kW gross. Pumps/auxiliaries consumed roughly 35–40 kW. **World first:** positive net at-sea closed-cycle OTEC power. **People made the loop run:** operators, pipe crews, barge crews, technicians, divers and maintainers. **Not commercial proof:** pipes, scale, corrosion, ecology and capital remained. **The platform continued:** later pipelines, OTEC tests, cooling, aquaculture, algae and monitoring.\n\nRead: https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13" }, "Instagram": { "caption": "On August 2, 1979, a barge floating off Keāhole Point generated electricity from a resource that surrounds Hawaiʻi in layers.\n\nSwipe through the ten-part visual story, then read the complete evidence record.\n\nhttps://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13\n\n#hawaii #powered #barge #temperature #difference" }, "Threads": { "post": "On August 2, 1979, a barge floating off Keāhole Point generated electricity from a resource that surrounds Hawaiʻi in layers.\n\nA Hawaiʻi technology story, told with its evidence and limits visible. https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13" }, "X": { "post": "On August 2, 1979, a barge floating off Keāhole Point generated electricity from a resource that surrounds Hawaiʻi in layers.\n\nRead the evidence-backed story: https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13" }, "TikTok": { "caption": "On August 2, 1979, a barge floating off Keāhole Point generated electricity from a resource that surrounds Hawaiʻi in layers. Full context, sources, and credits: https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13 #hawaii #powered #barge #temperature #difference", "onscreen": "What changes when Hawaiʻi is put back into the technology story?" }, "YouTube": { "title": "Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean", "description": "On August 2, 1979, a barge floating off Keāhole Point generated electricity from a resource that surrounds Hawaiʻi in layers.\n\nReview the article draft, Source Desk, credits, and carousel: https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13", "pinnedComment": "Sources and review materials: https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13" }, "Facebook": { "post": "On August 2, 1979, a barge floating off Keāhole Point generated electricity from a resource that surrounds Hawaiʻi in layers.\n\nThis edition includes the complete article, media credits, a ten-slide carousel, and Source Desk. https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13" }, "Bluesky": { "post": "On August 2, 1979, a barge floating off Keāhole Point generated electricity from a resource that surrounds Hawaiʻi in layers.\n\nhttps://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13" } }, "assetPosts": [ { "type": "carousel slide", "asset": "C14-13-slide-01", "audience": "People interested in Hawaiʻi, technology, invention, culture, public history, and accountable storytelling.", "keywords": [ "hawaiʻi", "powered", "barge", "temperature", "difference", "ocean", "august", "floating" ], "hook": "Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean", "post": "Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean\n\nSlide 1 of 10 from “Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean.” Read and download the complete edition: https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13", "recommendedPlatforms": [ "Instagram", "LinkedIn", "TikTok", "YouTube Shorts" ] }, { "type": "carousel slide", "asset": "C14-13-slide-02", "audience": "People interested in Hawaiʻi, technology, invention, culture, public history, and accountable storytelling.", "keywords": [ "hawaiʻi", "powered", "barge", "temperature", "difference", "ocean", "august", "floating" ], "hook": "On August 2, 1979, a barge floating off Keāhole Point generated electricity from a resource that surrounds Hawaiʻi in layers.", "post": "On August 2, 1979, a barge floating off Keāhole Point generated electricity from a resource that surrounds Hawaiʻi in layers.\n\nSlide 2 of 10 from “Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean.” Read and download the complete edition: https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13", "recommendedPlatforms": [ "Instagram", "LinkedIn", "TikTok", "YouTube Shorts" ] }, { "type": "carousel slide", "asset": "C14-13-slide-03", "audience": "People interested in Hawaiʻi, technology, invention, culture, public history, and accountable storytelling.", "keywords": [ "hawaiʻi", "powered", "barge", "temperature", "difference", "ocean", "august", "floating" ], "hook": "Mini-OTEC used the temperature difference between them to run a power cycle.", "post": "Mini-OTEC used the temperature difference between them to run a power cycle.\n\nSlide 3 of 10 from “Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean.” Read and download the complete edition: https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13", "recommendedPlatforms": [ "Instagram", "LinkedIn", "TikTok", "YouTube Shorts" ] }, { "type": "carousel slide", "asset": "C14-13-slide-04", "audience": "People interested in Hawaiʻi, technology, invention, culture, public history, and accountable storytelling.", "keywords": [ "hawaiʻi", "powered", "barge", "temperature", "difference", "ocean", "august", "floating" ], "hook": "Warm surface seawater passes through a heat exchanger and boils a working fluid with a lower boiling point—in Mini-OTEC’s closed cycle, ammonia.", "post": "Warm surface seawater passes through a heat exchanger and boils a working fluid with a lower boiling point—in Mini-OTEC’s closed cycle, ammonia.\n\nSlide 4 of 10 from “Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean.” Read and download the complete edition: https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13", "recommendedPlatforms": [ "Instagram", "LinkedIn", "TikTok", "YouTube Shorts" ] }, { "type": "carousel slide", "asset": "C14-13-slide-05", "audience": "People interested in Hawaiʻi, technology, invention, culture, public history, and accountable storytelling.", "keywords": [ "hawaiʻi", "powered", "barge", "temperature", "difference", "ocean", "august", "floating" ], "hook": "Pumps keep immense volumes of warm and cold water moving through the system.", "post": "Pumps keep immense volumes of warm and cold water moving through the system.\n\nSlide 5 of 10 from “Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean.” Read and download the complete edition: https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13", "recommendedPlatforms": [ "Instagram", "LinkedIn", "TikTok", "YouTube Shorts" ] }, { "type": "carousel slide", "asset": "C14-13-slide-06", "audience": "People interested in Hawaiʻi, technology, invention, culture, public history, and accountable storytelling.", "keywords": [ "hawaiʻi", "powered", "barge", "temperature", "difference", "ocean", "august", "floating" ], "hook": "Hawaiʻi eventually tested both approaches, but Mini-OTEC’s world-first claim belongs to the closed-cycle system.", "post": "Hawaiʻi eventually tested both approaches, but Mini-OTEC’s world-first claim belongs to the closed-cycle system.\n\nSlide 6 of 10 from “Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean.” Read and download the complete edition: https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13", "recommendedPlatforms": [ "Instagram", "LinkedIn", "TikTok", "YouTube Shorts" ] }, { "type": "carousel slide", "asset": "C14-13-slide-07", "audience": "People interested in Hawaiʻi, technology, invention, culture, public history, and accountable storytelling.", "keywords": [ "hawaiʻi", "powered", "barge", "temperature", "difference", "ocean", "august", "floating" ], "hook": "The temperature difference was only about 21 degrees Celsius.", "post": "The temperature difference was only about 21 degrees Celsius.\n\nSlide 7 of 10 from “Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean.” Read and download the complete edition: https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13", "recommendedPlatforms": [ "Instagram", "LinkedIn", "TikTok", "YouTube Shorts" ] }, { "type": "carousel slide", "asset": "C14-13-slide-08", "audience": "People interested in Hawaiʻi, technology, invention, culture, public history, and accountable storytelling.", "keywords": [ "hawaiʻi", "powered", "barge", "temperature", "difference", "ocean", "august", "floating" ], "hook": "Mini-OTEC therefore had little thermodynamic margin to waste.", "post": "Mini-OTEC therefore had little thermodynamic margin to waste.\n\nSlide 8 of 10 from “Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean.” Read and download the complete edition: https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13", "recommendedPlatforms": [ "Instagram", "LinkedIn", "TikTok", "YouTube Shorts" ] }, { "type": "carousel slide", "asset": "C14-13-slide-09", "audience": "People interested in Hawaiʻi, technology, invention, culture, public history, and accountable storytelling.", "keywords": [ "hawaiʻi", "powered", "barge", "temperature", "difference", "ocean", "august", "floating" ], "hook": "Small inefficiencies in pumps, heat transfer, pipe friction, turbine performance and auxiliary equipment could consume a large share of the output.", "post": "Small inefficiencies in pumps, heat transfer, pipe friction, turbine performance and auxiliary equipment could consume a large share of the output.\n\nSlide 9 of 10 from “Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean.” Read and download the complete edition: https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13", "recommendedPlatforms": [ "Instagram", "LinkedIn", "TikTok", "YouTube Shorts" ] }, { "type": "carousel slide", "asset": "C14-13-slide-10", "audience": "People interested in Hawaiʻi, technology, invention, culture, public history, and accountable storytelling.", "keywords": [ "hawaiʻi", "powered", "barge", "temperature", "difference", "ocean", "august", "floating" ], "hook": "Read the complete story, sources, credits, and reusable post kit.", "post": "Read the complete story, sources, credits, and reusable post kit.\n\nSlide 10 of 10 from “Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean.” Read and download the complete edition: https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13", "recommendedPlatforms": [ "Instagram", "LinkedIn", "TikTok", "YouTube Shorts" ] }, { "type": "source", "asset": "https://tethys-engineering.pnnl.gov/publications/mini-otec-operational-results", "audience": "Readers, researchers, educators, journalists, and people who want to inspect the evidence.", "keywords": [ "hawaiʻi", "powered", "barge", "temperature", "difference", "ocean", "august", "floating" ], "hook": "Source 1 behind “Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean”", "post": "Want to inspect the evidence behind “Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean”? Start with this source, then use the complete Source Desk to see how it supports—and limits—the story. https://tethys-engineering.pnnl.gov/publications/mini-otec-operational-results\n\nEdition: https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13", "recommendedPlatforms": [ "LinkedIn", "Threads", "X", "Bluesky" ] }, { "type": "source", "asset": "https://www.princeton.edu/~ota/disk3/1980/8016/801606.PDF", "audience": "Readers, researchers, educators, journalists, and people who want to inspect the evidence.", "keywords": [ "hawaiʻi", "powered", "barge", "temperature", "difference", "ocean", "august", "floating" ], "hook": "Source 2 behind “Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean”", "post": "Want to inspect the evidence behind “Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean”? Start with this source, then use the complete Source Desk to see how it supports—and limits—the story. https://www.princeton.edu/~ota/disk3/1980/8016/801606.PDF\n\nEdition: https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13", "recommendedPlatforms": [ "LinkedIn", "Threads", "X", "Bluesky" ] }, { "type": "source", "asset": "https://www.makai.com/renewable-energy/otec/", "audience": "Readers, researchers, educators, journalists, and people who want to inspect the evidence.", "keywords": [ "hawaiʻi", "powered", "barge", "temperature", "difference", "ocean", "august", "floating" ], "hook": "Source 3 behind “Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean”", "post": "Want to inspect the evidence behind “Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean”? Start with this source, then use the complete Source Desk to see how it supports—and limits—the story. https://www.makai.com/renewable-energy/otec/\n\nEdition: https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13", "recommendedPlatforms": [ "LinkedIn", "Threads", "X", "Bluesky" ] }, { "type": "source", "asset": "https://www.hnei.hawaii.edu/wp-content/uploads/2026-HNEI-Annual-Report.pdf", "audience": "Readers, researchers, educators, journalists, and people who want to inspect the evidence.", "keywords": [ "hawaiʻi", "powered", "barge", "temperature", "difference", "ocean", "august", "floating" ], "hook": "Source 4 behind “Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean”", "post": "Want to inspect the evidence behind “Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean”? Start with this source, then use the complete Source Desk to see how it supports—and limits—the story. https://www.hnei.hawaii.edu/wp-content/uploads/2026-HNEI-Annual-Report.pdf\n\nEdition: https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13", "recommendedPlatforms": [ "LinkedIn", "Threads", "X", "Bluesky" ] }, { "type": "source", "asset": "https://repository.library.noaa.gov/view/noaa/47051", "audience": "Readers, researchers, educators, journalists, and people who want to inspect the evidence.", "keywords": [ "hawaiʻi", "powered", "barge", "temperature", "difference", "ocean", "august", "floating" ], "hook": "Source 5 behind “Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean”", "post": "Want to inspect the evidence behind “Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean”? Start with this source, then use the complete Source Desk to see how it supports—and limits—the story. https://repository.library.noaa.gov/view/noaa/47051\n\nEdition: https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13", "recommendedPlatforms": [ "LinkedIn", "Threads", "X", "Bluesky" ] }, { "type": "discovered primary resource", "asset": "https://coast.noaa.gov/czm/thermalenergy/", "audience": "Readers, educators, researchers, journalists, technologists, and Hawaiʻi-connected communities.", "keywords": [ "hawaiʻi", "powered", "barge", "temperature", "difference", "ocean", "official", "technology", "guide" ], "hook": "The ocean does not need to be hot to become an engine. It needs two temperatures and a cycle between them.", "post": "The ocean does not need to be hot to become an engine. It needs two temperatures and a cycle between them.\n\nNOAA explains the cycle, tropical temperature requirement, byproducts and licensing role.\n\nhttps://coast.noaa.gov/czm/thermalenergy/\n\nhttps://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13#resources", "recommendedPlatforms": [ "Beehiiv / newsletter", "LinkedIn", "Instagram", "Threads", "X", "TikTok", "YouTube", "Facebook", "Bluesky" ], "platformPackage": "/resource-kits/C14-13-1.json" }, { "type": "interactive tool", "asset": "https://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13#interactive", "audience": "Readers, educators, researchers, journalists, technologists, and Hawaiʻi-connected communities.", "keywords": [ "hawaiʻi", "powered", "barge", "temperature", "difference", "ocean", "site-owned", "interactive", "technology" ], "hook": "Try this: Run an OTEC cycle.", "post": "Try this: Run an OTEC cycle.\n\nChange the temperature difference and follow the energy path.\n\nhttps://hawaii-tech-week-project-record.vercel.apphttps://hawaii-tech-week-project-record.vercel.app/stories/c14-13#interactive", "recommendedPlatforms": [ "Beehiiv / newsletter", "LinkedIn", "Instagram", "Threads", "X", "TikTok", "YouTube", "Facebook", "Bluesky" ], "platformPackage": "/resource-kits/C14-13-interactive.json" } ], "editorialReview": { "status": "reviewed", "reviewedAt": "2026-08-29T03:51:47.755Z", "checks": [ "absolute canonical URL", "nine platform variants", "clear evidence-led hook", "archive context preserved", "no AI-generated image claim", "platform character limits for X and Bluesky" ] }, "documentaryAssetPosts": [ { "assetId": "C14-13-documentary-01", "storyId": "C14-13", "storyTitle": "Hawaiʻi Once Powered a Barge with the Temperature Difference in the Ocean", "asset": "/media/c14-13/documentary-01.jpg", "sourceRecord": "https://commons.wikimedia.org/wiki/File%3AOTEC_in_Hawaii.jpg", "caption": "Ocean thermal energy conversion facilities at Keāhole Point on Hawaiʻi Island.", "alt": "Industrial ocean-energy facility on the Kona coast.", "credit": "See originating archive", "license": "Public domain", "audience": "Readers, educators, researchers, journalists, technologists, and Hawaiʻi-connected communities.", "keywords": [ "C14-13", "Hawaiʻi", "technology", "history", "documentary evidence" ], "platforms": { "Beehiiv / newsletter": { "headline": "Ocean thermal energy conversion facilities at Keāhole Point on Hawaiʻi Island.", "body": "Ocean thermal energy conversion facilities at Keāhole Point on Hawaiʻi Island.\n\nWhy it matters here: Documents the Hawaiʻi test site rather than illustrating OTEC generically.\n\nView the image, full story, rights record, and originating archive: https://hawaii-tech-week-project-record.vercel.app/stories/c14-13#visual-source-desk", "cta": "Read the documented edition: https://hawaii-tech-week-project-record.vercel.app/stories/c14-13" }, "LinkedIn": { "post": "Ocean thermal energy conversion facilities at Keāhole Point on Hawaiʻi Island.\n\nDocuments the Hawaiʻi test site rather than illustrating OTEC generically.\n\nThis image is part of the evidence—not decoration. Its archive record, credit, reuse basis, and full context are preserved here: https://hawaii-tech-week-project-record.vercel.app/stories/c14-13#visual-source-desk", "firstComment": "Originating archive and complete story: https://hawaii-tech-week-project-record.vercel.app/stories/c14-13" }, "Instagram": { "caption": "Ocean thermal energy conversion facilities at Keāhole Point on Hawaiʻi Island.\n\nDocuments the Hawaiʻi test site rather than illustrating OTEC generically.\n\nCaption, credit, alt text, license, and source record are preserved in the Visual Source Desk. Full edition: https://hawaii-tech-week-project-record.vercel.app/stories/c14-13" }, "Threads": { "post": "Ocean thermal energy conversion facilities at Keāhole Point on Hawaiʻi Island. Documents the Hawaiʻi test site rather than illustrating OTEC generically. 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