But, what about other islanded grids? Some are obvious \u2013 small island states in the Pacific or Caribbean. Others are carved out of huge continental networks, but behave like islands in practice because physics, politics or market rules limit how much help they can get from their neighbours.\u00a0<\/p>\n
That is where some of the most useful transition lessons are emerging.<\/p>\n
At one end of the spectrum are true geographic islands. Hawaii is now\u00a0the canonical example<\/a>. The last coal plant on Oahu was closed in 2022 and replaced much of its capacity with a 185 MW battery that\u00a0supports a rapidly growing fleet of solar projects<\/a>. <\/p>\n Coal is gone, oil is shrinking (down to about two-thirds of its electricity in early 2026), and storage has become a core provider of grid services rather than a bolt\u2011on. In a place where every litre of fuel arrives by ship, the economics of that shift are as important as the emissions.<\/p>\n Puerto Rico is trying, but with resilience first, decarbonisation close behind. After Hurricane Maria exposed the fragility of its centralised grid, the rebuild has leaned heavily on solar\u2011plus\u2011storage microgrids. <\/p>\n FEMA is\u00a0funding a nearly $100 million microgrid<\/a>\u00a0for Vieques and Culebra that brings 15 MW of solar and 11.6 MWh of storage to existing diesel plant, specifically to keep power on when the main system fails. <\/p>\n Non\u2011profit and community projects are backing at least ten more microgrids around critical services such as clinics and supermarkets. Here the story is less about hitting a national renewable percentage and more about making sure the lights stay on through the next storm, with less diesel burned each year.<\/p>\n Across\u00a0the Pacific islands<\/a>\u00a0\u2013 from Fiji and\u00a0Samoa<\/a>\u00a0to Tonga, Vanuatu and Palau \u2013 the pattern is similar. These systems still rely heavily on diesel, and Australian proponents are boosting to import\u00a0Australian rubbish for waste-to-energy<\/a>\u00a0\u2013 but the\u00a0economics of solar and batteries are better<\/a>. <\/p>\n Every litre of fuel saved is foreign exchange retained and risk reduced. The technologies are familiar \u2013 PV, batteries, flexible engines, smarter controls \u2013 but they are being assembled in ways that fit small, often fragile grids. In that context, \u201cenergy transition\u201d is as much about\u00a0sovereignty and balance of payments<\/a>\u00a0as tonnes of CO\u2082.<\/p>\n Europe is usually described in terms of large synchronous areas and cross\u2011border interconnectors, yet it too contains grids that operate more like islands.\u00a0Ireland and Northern Ireland share<\/a>\u00a0a system linked to Great Britain only by HVDC cables; from a stability and planning standpoint it behaves like a distinct islanded grid. <\/p>\n Over the last decade that system has shifted decisively towards wind. Wind already supplies roughly a third of its electricity, and coal at\u00a0Moneypoint closed midway through last year<\/a>.\u00a0Batteries have entered the market<\/a>\u00a0to provide fast system services. <\/p>\n Ireland\u2019s experience is a live demonstration that a small, windy grid can run reliably with very high variable renewable shares supported by a modest gas fleet and growing storage.<\/p>\n The Baltic states show a more geopolitical form of islanding. Estonia, Latvia and Lithuania historically operated as part of the Russian\u2011controlled BRELL ring. Their decision to\u00a0desynchronise and connect to the Continental Europe<\/a>\u00a0synchronous area required them to prove they could keep their systems stable without Russian support. <\/p>\n At the same time, they have rapidly\u00a0deployed utility-scale BESS<\/a>\u00a0as a critical component of synchronizing their power grids with continental Europe in February 2025, and are growing renewables and planned large offshore wind farms in the Baltic Sea.<\/p>\n In this case, islanding is both physical and political: shifting away from dependence on Russian fossil fuel and grid services toward a more autonomous renewable system anchored in the EU.<\/p>\n The same \u201chidden islands\u201d appear inside the big North American grid. On a map of high\u2011voltage lines, the United States looks fully meshed; in reality, it is split into three main synchronous areas: the Eastern Interconnection, the Western Interconnection and ERCOT in Texas. <\/p>\n ERCOT behaves like a de facto islanded grid, with only limited DC links to neighbours and its own market rules. In the last few years Texas has seen one of\u00a0the fastest battery build\u2011outs<\/a>\u00a0anywhere.\u00a0<\/p>\n By early 2026 ERCOT<\/a>\u00a0had close to 14 GW of battery capacity online, almost double the level a year earlier, alongside tens of gigawatts of wind and solar. <\/p>\n That build\u2011out is rapidly changing the role of gas peakers and reshaping price patterns, showing how a large, quasi\u2011island grid can\u00a0lean on storage and solar<\/a>\u00a0to manage variability and extreme events.<\/p>\n Within\u00a0North America<\/a>\u00a0there are also literal islands and remote regional systems: Alaska\u2019s patchwork of microgrids, remote Canadian communities, and thousands of microgrids on military bases, campuses and industrial sites designed to \u201cisland\u201d during disturbances. <\/p>\n These are not just resilience experiments. They are test beds for technology combinations \u2013 high\u2011penetration renewables, long\u2011duration storage, advanced controls \u2013 that can then scale into the main interconnections.<\/p>\n China looks monolithic at first glance: one national giant, knitted together by ultra\u2011high\u2011voltage AC and DC lines. Internally, though, grid companies still recognise distinct regional systems. <\/p>\n Remote regions such as Xinjiang, Tibet and Hainan have historically operated with weaker ties to the coastal load centres and, in some cases, their own balancing and dispatch logic. But large-scale transmission lines for renewable energy are being built to feed eastern demand hubs.\u00a0<\/p>\n Xinjiang in particular<\/a>\u00a0has surged ahead in wind and solar, at times generating more renewable energy than local demand and relying on long\u2011distance DC lines to export the surplus (and\u00a0ecological benefits, too<\/a>). <\/p>\n In that sense it behaves like a resource\u2011rich island at the edge of a continent, grappling with congestion, curtailment and the challenge of turning raw renewable potential into reliable, monetised capacity.<\/p>\n There are also compact systems that act like conceptual islands. <\/p>\n Singapore has limited domestic renewables and no room to waste. So it is investing in efficiency, flexible gas, regional imports and early\u2011stage hydrogen projects, while rapidly transforming its grid to incorporate renewables,\u00a0exploring floating solar and storage<\/a>, and aiming for\u00a06 GW of low-carbon electricity imports by 2035 and solar deployment of at least 2 GW by 2030.<\/p>\n It shows what a high\u2011income, resource\u2011constrained system can do when it accepts that it will always be an energy island in resource terms, even if it is physically connected to neighbours.<\/p>\n Across all these cases, the common thread is not geography but autonomy. Islanded and semi\u2011islanded systems cannot pretend the old fossil fleet will always come to the rescue. <\/p>\n They must plan for independence: high shares of renewables by necessity; storage and flexible demand as core tools; grid codes and markets tuned to fast response; and a clear understanding of what happens when tie\u2011lines fail. <\/p>\n For larger interconnected systems, their experience is a preview. Even on a continental grid, there will be moments \u2013 cyber-attacks, extreme weather, geopolitical shocks \u2013 when parts of the system must stand on their own. <\/p>\n Jurisdictions that have already learned to operate as islands, whether literal or metaphorical, will not be starting from scratch when the rest of the world is suddenly forced into island mode.<\/p>\n
![\"\"](\"https:\/\/www.newsbeep.com\/au\/wp-content\/uploads\/2026\/05\/1778028369_384_b946bca2fdbee99e6394276aa5ff5c7a159faa0bdd09deef862ae36dc1355802.png\")
<\/p>\n