Turning the Plan Into Action: Next Steps for Oʻahu’s Clean Energy System

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This is the culminating article in a series exploring from the outside a decarbonization solution set and coarse roadmap for Hawaiʻi. It is a set of possible next actions that a Hawaiian agency, utility, authority, or coalition could undertake if the roadmap outlined in this series is worth exploring further. The work to this point has been a thought exercise in the art of the possible. It shows that Oʻahu’s domestic civilian energy system can be rebuilt around roughly 6,000 GWh per year of electricity, with solar supplying most of the energy, batteries and demand management shaping it across the day, district cooling reducing peak loads, some onshore wind adding diversity, and a small biomethane reserve covering rare events. That is a coherent end state. The next step is not to assume it will happen. The next step is to determine whether it can be made real in a way that is testable, understandable, and acceptable.

The first move is not to build everything. It is to make the roadmap precise enough to act on. A system that spans decades, multiple sectors, and multiple institutions cannot move directly from a 2050 vision to procurement and construction. It has to pass through stages where assumptions are clarified, responsibilities are assigned, and dependencies are made explicit. Without that, even a sound technical design will stall in delivery.

The most important first step is to break the roadmap into detailed five-year execution plans. The existing framing of 2026 to 2030, 2030 to 2040, and 2040 to 2050 is useful for orientation, but it is too coarse for execution. A Hawaiian agency taking this forward would need to define targets and milestones for each five-year period, including how much solar is added and in what form, how many gigawatt hours of batteries are deployed and where, how much flexible load is enrolled, how district cooling phases are sequenced, how biomethane production scales, and how airport and harbor fuel logistics are built out. Each of those elements should have a responsible entity, a timeline, and a clear set of prerequisites. A five-year plan should answer simple questions. What gets built? Who builds it? When it is delivered? What must happen first?

Those plans should be paired with interim Sankeys every five years. A baseline Sankey exists today. The next ones should show 2030, 2035, 2040, 2045, and 2050 states, each balanced and each preserving the same useful energy services. In the earlier work, those services totaled 6,221 GWh per year across residential, commercial, industrial, and transportation uses. Each interim Sankey should show how the system moves from oil and waste-based generation toward solar, wind, batteries, environmental thermal inputs, and biomethane, while also showing the evolution of rejected energy. Further, they would include any expected changes in the domestic economy, something outside of the scope of my analysis. The value of this is not visual appeal. It is discipline. A Sankey that does not balance forces correction. A Sankey that is updated every five years makes drift visible. It becomes clear whether oil is declining at the expected rate, whether solar is scaling as planned, and whether storage and flexibility are keeping pace.

Once those interim targets exist, the next step is to test them against reality. Annual energy balances are necessary, but not sufficient. The grid operates hourly. A Hawaiʻian agency taking this forward would need to build an hourly model using historical solar irradiance, wind, and load data for Oʻahu. That model should include solar, wind, batteries, demand response, heat pump water heaters, vehicle-to-home, district cooling effects, and biomethane dispatch. It should be run across multiple years of weather, including periods of cloud cover, lower wind, and higher load. The objective is not to prove the system is perfect. It is to find where it breaks. If a modeled week shows a 1 GWh shortfall, the plan needs adjustment. If the system holds across ten years of data with manageable use of reserves and curtailment, the roadmap moves from plausible to defensible.

A strong basis for this if Hawaiʻian agencies don’t already have one is the open source Energy Transition Model. When the Netherlands transmission system operator, TenneT, engaged me and other experts to assist them with a pragmatic 2050 decarbonized energy scenario for the country, this is the tool that they used to ensure that everything balanced across the year, iterating through solutions until we had a robust set that met the modeled weather requirements for the nation for four different years.

After that, the focus shifts from abstract capacity to specific projects. The transition will not succeed if it begins with the most contentious developments. A Hawaiian agency should identify a pipeline of no-regret projects that can be deployed early. These include parking canopy solar at scale, rooftop solar expansions, community batteries on constrained feeders, smart EV charging hubs, early district cooling phases in Waikīkī and downtown, and expansion of wastewater-based biomethane. The earlier analysis suggests that parking canopy solar alone can supply several thousand GWh per year on Oʻahu, while district cooling can reduce roughly 160 GWh per year of commercial electricity demand. These are not marginal changes. They are visible, tangible, and lower conflict. Early success here builds credibility for more difficult steps later.

With a project pipeline defined, the next requirement is a delivery structure that can coordinate the work. The transition crosses Hawaiian Electric, the Public Utilities Commission, the Hawaiʻi State Energy Office, the Department of Transportation, the City and County of Honolulu, waste and water agencies, workforce institutions, and private developers. Without coordination, each piece moves at a different speed and the system fragments. A dedicated delivery unit or coordinating body is needed with clear authority, reporting, and accountability. Its role is to align permitting, procurement, financing, and community engagement so that the system evolves as a system rather than as a set of disconnected projects.

That delivery structure also needs a public-facing narrative and dashboard. A transition of this scale cannot operate as an internal plan. It has to be visible and understandable. The narrative should explain what changes first, what households and businesses will see, how costs evolve, and how reliability is maintained. The dashboard should track progress against the five-year plans and interim Sankeys. It should show installed solar capacity, battery deployment, flexible load participation, district cooling coverage, biomethane output, and reductions in oil use. It should also show where the system is not meeting expectations. This is not public relations. It is how the transition earns trust over time.

The process should be used to surface tradeoffs, not hide them. If land constraints reduce available solar capacity, that should appear in the Sankey and the five-year plan. If battery deployment lags, the impact on peak demand should be visible. If V2H participation is lower than expected, the gap in flexibility should be clear. The roadmap should be treated as a living system, not a document to defend. Revision based on evidence is a sign of strength, not failure.

The broader barrier set remains in view but should not be confused with the primary blockers. Workforce, supply chains, airport and harbor fuel logistics, tourism impacts, and waste system reform are all real. They require planning and coordination. Hawaiʻi’s own workforce initiatives recognize the need for electricians, lineworkers, HVAC technicians, and system operators. Airport and harbor infrastructure must be built for imported low-carbon fuels for aviation and shipping. Tourism will be affected by changes in long-haul aviation costs. Waste reform must replace H-POWER’s disposal function. These are significant tasks. But they are not reasons the system cannot exist. They are tasks that follow once the system has permission to be built.

That distinction is important. External analysis can show that the end state is technically feasible and that LNG is not required for Oʻahu’s domestic system. It can outline the sequence of actions and identify where the risks lie. It cannot determine how Hawaiʻi chooses to resolve questions of land use, cultural acceptance, or economic tradeoffs. Those decisions belong to Hawaiians. The role of this work is to make the consequences of different choices clear, not to prescribe outcomes.

The practical implication is that the transition should be treated as a disciplined process rather than a set of isolated decisions. Begin with five-year execution plans. Pair them with balanced interim Sankeys. Test them against real hourly conditions. Build a pipeline of low-conflict, high-value projects. Establish a coordinating delivery structure. Make progress visible through a public dashboard. Adjust based on evidence. Each step reinforces the others. Together they turn a conceptual end state into a system that can be built.

The central insight is that the hardest step is not technical. It is organizational and social. The technologies needed for Oʻahu’s transition are known and increasingly mature. The remaining work is to structure the transition so that it is clear, testable, and credible to the people who will live with it. If that happens, the rest of the system follows.