Flying Into the Light - What Europe's Energy Transition Taught Me About Tonga's Future

I'm writing this from the 25th floor, looking outside the window scoping for solar panels, wind turbines on hilltops, EV charging stations, electric trams in every city centre. It made me think about home, "Tonga".

The Journey That Ignited This Piece

Good analysis does not begin at a desk. It begins in the field or in this case, on a long haul flight out of Nuku'alofa, a transit through Auckland, a connection in Singapore, and then a series of train journeys through Europe that gave me hours of window time to think.

Auckland - efficient, clean, increasingly electrified. Singapore - one of Asia's most energy disciplined cities, where rooftop solar on HDB public housing blocks is now a national programme, not an experiment. Then Europe - and that is where the real education happened. Researching city by city, I kept finding the same picture i.e. solar panels on warehouse rooftops, on noise barriers along motorways, on car parks, on residential estates, on farms. Wind turbines on every ridge. And everywhere, in train station car parks, in city centres, along motorways, in suburban neighbourhoods, EV charging stations. Not as novelties, but as infrastructure woven into the fabric of daily life. The Netherlands leads Europe with over 210,000 public charging points, the highest density on the continent at ten charge points per thousand inhabitants. Germany has crossed 184,000 chargers, with 67% of its motorway network already covered, far ahead of what the EU requires. These aren't pilot projects. This is the infrastructure of an energy transition in full, visible progress and once you see it at scale, the question stops being whether it's happening, and starts being why it isn't moving faster everywhere else.

I am a trained engineer and a practising analyst. My instinct when I observe something working is not to admire it and move on, it is to ask what made this work, and how do I adapt it for home? That is what I have been doing across this entire trip. Studying what works here, contextualising it, and customising it for the Pacific.

This piece is the output of that process. But it is also something more personal than that.

Thirty Years of Watching the Same Problem

Before I talk about what Europe is doing, I need to be honest about where this analysis comes from.

I spent ten years, from 1992 to 2002 working at the Tonga Electric Power Board (TEPB), which later became Tonga Power Limited (TPL). My role was as a GIS Specialist, and I was there during a formative decade for the utility i.e. a period when the grid was expanding, when load growth was real, and when the foundational decisions were being made about how to spatially manage a distributed electricity network across an island nation.

Those years taught me things no textbook or conference could i.e. how power flows through a distribution network, what it takes to spatially catalogue every asset from source to meter, how quickly institutional knowledge disappears when experienced staff leave, and above all, how impossible it is to plan or operate a utility when you do not have a complete, accurate spatial picture of what you actually own. One of the core operational vision we worked towards at TEPB was keeping the power factor below 1, the engineering measure of how efficiently a network is converting electrical power into useful output, with minimum reactive power waste. It is a simple but demanding target, you cannot achieve it without knowing exactly where every load, transformer, and cable segment sits in the network, and how current is actually flowing through it.

Two decades later, most of that knowledge base has either retired or emigrated. The grid has grown. But the fundamental challenge remains i.e. Tonga Power Limited (TPL) is operating a complex electricity network without a complete digital asset register that links every component in the supply chain, from generator to meter.

I will come back to this, because it sits at the heart of everything I am proposing.

The Iran Context - Familiar Ground

The conflict in Iran is not going away. What began as a regional geopolitical flashpoint has become a reminder, not a new one, of what happens when an economy builds its energy architecture on a single, fragile commodity i.e. fossil fuel.

Oil supply chains are disrupted. Fuel prices spike globally. Island nations like Tonga, thousands of kilometres from the nearest refinery, absorb the shock with no buffer and no plan B. This is the same structural vulnerability that existed in 1992 when I started at TEPB. It existed after the 2022 Hunga Tonga eruption. It exists today. The lack of energy diversification is not a crisis that arrived suddenly. It is a policy choice that has been renewed, by default, for decades.

Here in Europe, I watch electric trams glide through city centres. I ride trains powered by renewable electricity between countries that have legislated their way out of fossil fuel dependency. At every major train station, EV charging hubs serve commuters who drive to the station and charge while they travel. The Dutch have achieved the highest ratio of chargepoints per capita in Europe, a deliberate policy outcome, not an accident. Germany installed nearly 40,000 new public chargers in 2024 alone, including over 12,500 DC fast chargers. This is not futurism. It is the result of sustained, deliberate policy over twenty to thirty years.

The Pacific deserves the same sustained deliberateness.

What Europe's Clean Energy Roadmaps Actually Look Like

As an analyst, I am careful not to romanticise what I observe. Europe's energy transition is real but uneven, and the uneven parts are as instructive as the successes. Some verified facts worth grounding this in:

Germany — Energiewende (Energy Transition) Germany's Erneuerbare-Energien-Gesetz (Renewable Energy Sources Act, EEG) was enacted in April 2000, replacing a weaker 1991 electricity feed in law that had failed to move the dial on solar and biogas. The EEG introduced differentiated feed in tariffs by technology type and scale, guaranteed grid access for renewable generators, and set declining tariff schedules to drive cost reduction over time. The results, twenty five years on, are measurable i.e. by 2024, 62.7% of Germany's electricity came from renewables (Fraunhofer Institute for Solar Energy Systems), with wind the largest source at ~32% and solar contributing ~14%. Wind and solar together have grown from less than 2% of generation in 2000 to approximately 45% by 2025 (Ember). The honest caveat is that Germany remains the largest coal producer in the EU. The transition is real and significant, but it is not complete.

Denmark Denmark in 2024 achieved 88.4% of net electricity generation from renewables, the highest share of any EU country (Eurostat, March 2025), driven overwhelmingly by wind power, both onshore and offshore. Denmark has consistently legislated long term renewable targets and backed them with grid investment and interconnection with neighbouring countries. Its 2030 target is 117% of domestic electricity demand from variable renewables, the surplus exported. This is the result of sustained policy commitment over more than three decades.

The Netherlands and Belgium — A More Honest Picture Both countries have high rooftop solar adoption, but the policy story is more nuanced than a simple feed in tariff success. The Netherlands by early 2024 had approximately one third of households with solar panels installed, largely incentivised by net metering, the ability to run the meter backwards when exporting to the grid. However, the Dutch government is abolishing net metering entirely as of January 2027 as grid saturation increases, replacing it with time differentiated export tariffs. Belgium's Flanders region introduced capacity based tariffs in 2023, which penalise peak midday solar exports and push households toward batteries or flexible loads.

But the Netherlands tells an even more instructive story on EV infrastructure. With 183,000 public charging points, the highest absolute number in Europe and the highest chargepoints per capita ratio on the continent, the Dutch have demonstrated what deliberate infrastructure investment looks like. They have 66 charge points per kilometre of highway, making it the most accessible country for EV charging in Europe. This wasn't market driven, it was policy driven, with municipalities required to install public chargers within a set radius of any resident request.

The lesson here is as important as the success story i.e. policy that drives rapid solar adoption creates new grid management challenges that require the next generation of policy to solve. And successful EV transitions require charging infrastructure to lead adoption, not follow it. Tonga, deploying solar from a lower base with a smaller grid, has the advantage of designing the incentive structure knowing these second order effects exist.

Switzerland — Motorway and Railway Solar, Early Stage but Real The facts are more nascent than the visual impression suggests. Switzerland's Federal Roads Office (ASTRA) has approved the first two photovoltaic systems on the A15 Oberland motorway near Wangen Brüttisellen, which were targeted for completion in the first half of 2025. These are the first operational motorway solar installations in Switzerland. ASTRA's target is to generate approximately 35 GWh/year from motorway adjacent solar by 2030. Additionally, a Swiss start up, Sun Ways, has developed and received permits for a pilot installation of solar panels between railway tracks, overcoming significant regulatory hurdles including concerns from the Federal Office of Transport and the International Union of Railways about panel durability and glare. Switzerland also passed a law in 2023 requiring all new buildings with more than 300 m² of roof or facade area to install solar panels, and the city of Zurich extended this mandate to existing large roofs by 2040. Switzerland installed 1.78 GW of new solar capacity in 2024 (Swissolar).

The critical observation for Tonga is not that motorway solar is mature, it is not. It is that these countries are actively finding and legislating every viable surface for generation. The logic is identical to what I am proposing for Tonga i.e. every committed structure, government buildings, schools, churches, community halls, is a potential generation node at marginal incremental cost.

The consistent lesson across every country I have observed i.e. Netherlands, Germany, France, Belgium, Switzerland is that the energy transition does not happen because the technology arrives. It happens because governments create the conditions, regulation, incentives, long-term targets that make the economics work for ordinary people and businesses. And it happens because someone, at some point, decided to start.

Europe's EV Charging Infrastructure, The Numbers That Matter The EV transition I observed from train windows deserves its own accounting, because it demonstrates the infrastructure-first principle that Tonga must learn from:

The critical insight: EV charging infrastructure in Europe grew 37% in 2024, while total charging capacity grew 49% reflecting the shift toward faster DC charging. Between 2017 and 2023, EV sales grew 18-fold while public chargers grew only 6-fold, creating temporary bottlenecks that countries are now racing to close. The lesson for Tonga i.e. build charging infrastructure before it becomes a constraint, not after.

Tonga's Energy Reality - The Numbers We Cannot Ignore

Let us be precise, because we cannot manage what we do not measure.

• Tonga's electricity net consumption: approximately 70 million kWh annually (World Data Atlas, 2022)
• Tonga Power Limited (TPL) generation: nearly 100% diesel fired across the main island and outer islands
• Diesel fuel represents roughly 50–60% of TPL's operational costs
• Average Tongan household electricity tariff: among the highest in the Pacific at approximately TOP 0.85–0.92 per kWh (2025 rates, subject to quarterly diesel price adjustments)
• Fuel import bill: over TOP 100 million annually, a direct and recurring drain on foreign reserves
• Tonga's average solar irradiance: 6–7 peak sun hours per day, among the highest in the Pacific

Every hour of sun that passes without a solar panel beneath it is money imported from abroad and burned. That was true in 1992. It is still true in 2026.

One further resource deserves an honest mention, even if only in passing i.e. geothermal energy. Tonga sits on one of the most volcanically active submarine ridges in the Pacific, the Tonga Kermadec Arc. The 2022 Hunga Tonga, Hunga Ha'apai eruption was a stark reminder that significant thermal energy exists beneath and around these islands. Whether any of that resource is safely and economically extractable for electricity generation is genuinely unknown. There has been limited formal exploration, and the engineering and environmental challenges of submarine geothermal development are substantial. I am not proposing geothermal as a near term solution, the technology, the surveys, and the risk assessments required make it a long horizon possibility at best. But it is territory worth mapping, and it belongs in any honest accounting of Tonga's indigenous energy endowment. Solar is the immediate, proven, deployable answer. Geothermal is the frontier worth exploring, carefully, with the right expertise, and on Pacific terms.

The Roof Calculation - Ground Truthed Against Real OSM Data

In 2024, I presented a rooftop solar potential analysis at the Tonga Youth ICT Symposium based on estimated national building stock figures. I have since been able to ground truth that estimate against actual building polygon data from OpenStreetMap, using the same calculation engine built into the TPL Solar Microgrid DePIN GIS POC.

The OSM query across Tonga's full bounding box returns 50,181 mapped building footprints with a combined area of 5.70 km². Applying the same methodology used in our SolarAssetRegistry.sol smart contract:

An important caveat i.e. OSM building coverage in Tonga is partial. The 50,181 ways represent the mapped national stock significant areas, particularly rural and outer island communities, remain unmapped in OSM. The true figure is almost certainly higher, not lower. The 29× multiple is a conservative floor, not a ceiling.

The proposition remains unchanged i.e. begin systematically, rooftop by rooftop, household by household, government building by government building. Even capturing a fraction of this potential transforms Tonga's energy balance. Total rooftop solar electrification across eligible mapped structures would:

1. Eliminate TPL's dependence on diesel for baseload generation
2. Reduce household electricity bills by 60–80%
3. Create a distributed, cyclone resilient generation network that no single disaster can knock out entirely
4. Generate surplus energy that can be fed back into the TPL national grid via net metering

The model is well established. Feed in tariffs, net metering, community solar cooperatives, government subsidised installation schemes. Europe has been refining these tools for twenty years. The technology is proven. The economics are clear. What has been missing is a credible, locally owned plan to implement them.

Solar + EVs - Adapting the European Model for Tonga

Transport accounts for a significant portion of Tonga's fuel import bill. The European model i.e. solar generation powers the grid, the grid charges EVs, EVs return surplus charge via Vehicle to Grid (V2G) technology during peak demand is directly transferable in principle, if adapted to Tonga's scale and geography.

What I see in Europe today is not just EVs, it is an integrated ecosystem. Train station car parks with rows of chargers. Shopping centres where you plug in while you shop. Residential streets where every fourth parking space has a charging post. Motorway service stations with banks of DC fast chargers that deliver 80% charge in 20 minutes. This infrastructure did not appear organically. It was legislated, incentivised, and built ahead of demand.

The Netherlands' approach is particularly instructive i.e any resident can request a public charger near their home, and the municipality is obligated to install one. This policy driven density, 66 chargers per 100km of highway eliminated range anxiety before it could become a barrier to adoption.

For Tonga, the roadmap is:

• Phase 1: Rooftop solar on homes, schools, government buildings, and commercial properties, tied to the TPL grid via net metering
• Phase 2: Battery storage at household and community microgrid level, reducing evening peak demand on diesel generators
• Phase 3: EV charging infrastructure at key nodes, government offices, Nuku'alofa town centre, the airport, sea and airport terminals powered by dedicated solar arrays
• Phase 4: EV fleet conversion for government vehicles and taxis, charged by solar surplus
• Phase 5: V2G integration, turning Tonga's vehicle fleet into a distributed energy storage layer

The critical lesson from Europe i.e. do not wait for EVs to arrive before building chargers. Build chargers first. Tonga's small geographic footprint — Tongatapu is only 260 km², means a network of 20–30 strategically placed public chargers could provide complete coverage. That is not a massive infrastructure project. It is achievable within a single budget cycle if prioritised.

Each phase reduces diesel imports. Each phase lowers TPL's operating costs. Each phase increases resilience against the geopolitical fuel price shocks that have repeatedly exposed Tonga's vulnerability.

The FSM Experience - Proof That Pacific Utilities Can Do This

My analysis of what Tonga needs is not theoretical. It is built on direct implementation experience.

Under ADB Grant 175726, I worked with the FSM Utilities, Kosrae Utilities Authority, Pohnpei Utilities Corporation, and Yap State Public Service Corporation to deploy an AI-Powered DePIN GIS system for infrastructure management. The operational objective was one I recognised immediately from my years as a GIS Specialist at TEPB i.e. map every asset in the network from source to customer meter, and use that complete spatial picture to manage operations with a target power factor below 1.

Keeping the power factor below 1 was the same vision I had worked towards at TEPB decades earlier. It is the engineering measure of how efficiently a grid converts electrical power into useful work, a power factor approaching 1 means minimal reactive power waste, lower transmission losses, and lower operating costs for the utility and its customers. It sounds like a simple target. It is not. You cannot achieve it without a complete, accurate, spatially referenced record of every asset in the network, every generator, transformer, cable segment, switching point, and customer meter and a clear picture of how load is actually flowing through the system at any given time.

At TEPB in the 1990s, we were working towards this with the GIS tools available at the time. In FSM, I was able to apply the same principle with modern openbsource GIS, mobile data collection, and blockchain backed asset registries. Field technicians maps assets using mobile QField tools. Operations were managed against measurable targets. On simple caveat The system can only work if the data is complete.

That continuity, from TEPB in 1992 to FSM in the 2020s, is what I am now bringing back to Tonga

TPL's Blind Spot - Flying Without Instruments

Here is the hard truth that my time at TEPB and my subsequent work in FSM makes very clear i.e. Tonga Power Limited (TPL) is currently operating its network without a complete, end-to-end asset register.

TPL has a GIS system. That is a start. But having a GIS system is not the same as having a complete asset register. The gap, and it is a significant one , is that the network has not been fully mapped from source to destination i.e. from the diesel gensets, along every segment of the transmission and distribution network, through every transformer and pole and cable, all the way to every customer meter, and then linked to the billing system's kWh data.

Without that complete chain, you cannot do a load flow study. And without a load flow study, you cannot:

• Determine where network losses are occurring and why
• Optimise the placement of solar generation or battery storage
• Model the impact of adding distributed generation to specific parts of the network
• Identify sections of the network that are operating outside design parameters
• Plan proactive maintenance rather than reacting to failures

This is not a criticism for its own sake. I lived this challenge at TEPB in the 1990s, when the tools to solve it barely existed. They exist now. The FSM deployment proved that a Pacific Island utility can build this complete picture using open source GIS tools, mobile data collection, and a well structured asset registry without expensive proprietary software or foreign consultants.

The saying that frames everything I do in this space is simple and old: "You cannot manage what you do not measure."

TPL is managing under difficult conditions, and it is doing so without the full measurement picture. The next step is to build it.

DePIN GIS - The Architecture That Closes the Gap

The TongaPost DePIN GIS demonstrated that a Pacific utility can deploy a blockchain backed, open architecture GIS system that keeps data sovereign, operations transparent, and asset records immutable. Results included a 30–40% improvement in delivery route efficiency and a 25–30% reduction in fuel costs through AI optimised routing.

The same architecture, adapted for TPL's electricity network, becomes the TPL Solar Microgrid DePIN GIS and it addresses both the immediate solar integration challenge and the underlying asset register gap.

Introducing - TPL Solar Microgrid DePIN GIS, A Proof of Concept

I am building a TPL Solar Microgrid DePIN GIS, a Proof of Concept modelled on the TongaPost and FSM Utilities deployments, adapted for Tonga's electricity network and solar energy transition.

View the Live POC Dashboard

What the System Does

1. End-to-End Asset Registry Every asset in the network i.e. from gensets to transformers to poles to customer meters registered and mapped. Every rooftop solar installation registered as a Dynamic NFT on the Pasifika Data Chain, carrying:

• GPS coordinates and rooftop area (derived from OSM building polygons)
• Installed capacity (kW) and generation data (kWh)
• Battery storage capacity and state of charge
• Grid connection point and feed-in volume
• Last maintenance date and next scheduled service

This is the foundation for load flow studies. Without it, nothing else is possible.

2. Solar Capacity Estimation from Rooftop Area Using open OSM building data, the system calculates estimated solar capacity for every mapped building:

• Usable rooftop area (75% of total footprint, accounting for ridge, eaves, and obstructions)
• Low/mid/high capacity estimates (±5% range) based on 200 W/m² monocrystalline panel density
• Daily and annual generation estimates using Tonga's 6.5 peak sun hours per day

This turns every building in the OSM database into a quantified potential solar node before a single panel is installed.

3. Grid Balance Monitoring

• Total solar generation across all registered nodes (kW)
• TPL grid consumption vs. solar feed in (kWh balance)
• Diesel generation displacement in real time
• CO₂ avoided and fuel cost savings per hour

4. DePIN GIS Maintenance Intelligence

• Planned maintenance: scheduled based on asset age and performance data, logged immutably on chain
• Unplanned maintenance: field technicians use mobile QField to photograph and GPS tag faults i.e. smart contracts trigger work orders automatically
• Performance anomaly detection: generation drop flags raised automatically when output falls below modelled expectations

5. Feed In Tariff Transparency Every household feeding surplus energy into the TPL grid i.e. contribution logged immutably, feed in credits calculated by smart contract. No disputed bills. No manual reconciliation.

6. Subsidy Tracking Government solar subsidies tracked on chain from allocation to disbursement. Auditors and citizens can verify that funds reached their intended recipients.

The Architecture

┌─────────────────────────────────────────────────────────────┐
│                  TPL Solar DePIN GIS Stack                  │
├─────────────────┬───────────────────┬───────────────────────┤
│  Frontend Layer │   AI Agent Layer  │   Blockchain Layer    │
│                 │                   │                       │
│  React Dashboard│  Computer Vision  │  Pasifika Data Chain  │
│  Leaflet GIS Map│  Fault Detection  │  Dynamic NFT Assets   │
│  Mobile QField  │  Generation       │  Smart Contracts:     │
│  (Field Data)   │  Forecasting      │  - Asset Registry     │
│                 │  LLM Maintenance  │  - Feed-in Tariffs    │
│                 │  Reports          │  - Work Orders        │
│                 │                   │  - Subsidy Tracking   │
└─────────────────┴───────────────────┴───────────────────────┘

This is not a concept paper. The FSM and TongaPost deployments proved every component. This is assembly and adaptation, not invention.

The Government's Role - Policy Creates the Conditions

Private solar adoption in Tonga has been slow not because Tongans don't want it, but because the upfront cost is approximately USD 5,000–15,000 for a household system with battery storage is prohibitive for most families. This is the market failure that government must correct, as governments across Europe have done.

Net Metering Legislation

Mandate that TPL purchase surplus solar generation from households and businesses at a fair feed in tariff. This turns every solar equipped rooftop into a micro revenue source. It balances the grid. It reduces diesel consumption.

Targeted Subsidies and Tax Exemptions

• Remove all import duties on solar panels, inverters, batteries, and EV charging equipment
• Direct installation subsidies for low income households
• Concessional government loans at 0–2% interest, repaid through electricity bill savings
• Fast track regulatory approval for grid connected solar installations

Regulatory Mandates

• Require all new building permits to include solar ready roofing specifications
• Set a binding target: 100% renewable electricity generation for Tonga by 2035
• Establish minimum feed in tariff guarantees of 10 years to de risk private investment

The ADB, World Bank, and Green Climate Fund all have active Pacific energy financing windows. The tools exist. The financing exists. The leadership to claim them is what is needed.

This Is Not About Reinventing the Wheel

I want to be direct about something i.e. this work is an accumulation. It is thirty years of energy sector experience, ten years at TEPB, subsequent decades in regional ICT and infrastructure work, and the most recent deployments in FSM and Tonga Post distilled into a system that is adapted for Tonga's specific context.

Good analysts study what works elsewhere and then contextualise it. They do not copy blindly. Germany's Energiewende took twenty five years and hundreds of billions in investment. Tonga does not need to replicate the scale, but it can replicate the logic. The FSM GIS deployment was adapted from global best practice in utility asset management, it worked because it was customised to Pacific operational realities, not because it imported a foreign model wholesale.

The same principle applies here. What I observed travelling through Europe, the renewable energy infrastructure, the train networks, the legislative frameworks provides the reference cases. The ten years at TEPB provide the institutional memory of what Tonga's grid actually looks like from the inside. The FSM deployment provides the proof that this can be built and operated by Pacific practitioners, for Pacific utilities.

The driver's seat belongs to someone who knows the road.

The Ask - A Clear Call to Action

To the Government of Tonga and MEIDECC:

• Legislate net metering and feed in tariff guarantees
• Remove import duties on all solar, battery, and EV charging equipment
• Establish a National Solar Subsidy Fund financed through ADB, World Bank, and GCF windows
• Mandate solar ready building standards for all new construction
• Commission a full national electricity asset survey, source to meter using DePIN GIS technology

To Tonga Power Limited:

• Complete the asset mapping project i.e. every genset, every transformer, every pole, every cable, every customer meter, linked end to end in the GIS
• Pilot the TPL Solar Microgrid DePIN GIS POC across 100 households in Nuku'alofa
• Publish real time generation and consumption data publicly

To Pacific Leaders and Regional Bodies (PIFS, SPC, SPREP):

• Adopt the FSM Utilities + TongaPost DePIN GIS architecture as a Pacific regional standard for utility infrastructure management
• Fund cross island replication i.e. the playbook exists, the cost of the second deployment is a fraction of the first

To Tongan Citizens and Communities:

• Your roof is infrastructure. Demand the subsidies and the regulatory framework to make it count.
• Hold your government and TPL accountable for the 2035 renewable energy target.

Conclusion - From Europe, Looking Home

I will leave Europe and return home. The train journeys, the solar panels on the motorway barriers, the silent electric trams, they will recede into memory. But the analysis they ignited will not.

Tonga has everything it needs for an energy transition i.e. the solar resource, the rooftops, the technical talent, the financing pathways, and now demonstrated through FSM and TongaPost, the proven GIS and blockchain tools to manage it. What the transition requires is the same thing Europe's transitions required i.e. sustained political will, clear legislation, and the willingness to invest in measurement before management.

The first measurement task is the most urgent i.e. TPL must complete its asset register. From the gensets to the customer meters, every component of the network mapped, verified, and linked. Until that is done, load flow studies are guesswork, solar integration planning is approximate, and operations management is reactive rather than proactive.

That is the work. It is not glamorous. It is not the kind of thing that makes headlines. But it is the foundation on which everything else, the solar panels, the feed in tariffs, the EV fleet, the renewable energy targets must be built.

You cannot manage what you do not measure. And you cannot navigate safely without instruments.

Let's Go!