Community-owned hybrid energy · Cape York · Queensland
A solar + LiFePO₄ battery + diesel backup hybrid microgrid for the Lama Lama people at Port Stewart — ending diesel dependency, enabling community ownership, surviving the tropics.
The Lama Lama people at Port Stewart, Cape York Peninsula, currently rely entirely on diesel generators for all energy needs. Diesel costs 4–6 times the price of grid electricity, creating chronic energy insecurity, noise pollution, and health risks that cascade across every aspect of daily community life.
This project — submitted to the Engineers Without Borders Australia Challenge under Design Area 3.2: Microgrids and Hybrid Systems for Outstations — proposes a community-owned, AC-coupled solar + LiFePO₄ battery + diesel backup hybrid microgrid for the Lama Lama community. The design is modular, locally maintainable, cyclone-rated, and built around the community's right to self-determination.
Our recommended solution — Option F, the Shared Community Microgrid with smart metering — scored 4.5/5.0 in a weighted decision matrix across six PESTEL-derived criteria. The design features a 40 kWp solar array, 120 kWh battery bank, and an auto-failover sequence that ensures the health clinic is always powered regardless of battery state.
Total gross capital cost is approximately $316,250, reduced to ~$158,250 net through an estimated 50% ARENA grant offset. Operations and maintenance costs fall below diesel running costs from Year 2, saving ~$37,000 per year by Year 3. The project complies with the Native Title Act 1993, AS/NZS 4777.1, and FPIC requirements.
The Lama Lama community at Port Stewart relies entirely on diesel generators — expensive, noisy, unreliable, and vulnerable to every supply disruption.
Remote Indigenous communities in far-north Queensland have no grid connection. Diesel generators cost 4–6× grid prices, creating chronic energy insecurity, constant noise, and real vulnerability every time a fuel delivery is delayed by wet-season flooding.
The Lama Lama people at Port Stewart face this every day. Our goal: a modular solar + battery hybrid microgrid that scales as budget allows, can be repaired locally, and survives cyclones, 50°C heat, and feral pig damage to conduits.
Click each tab to explore how every contextual factor shaped our design decisions.
Persona: Mary, 45 — Lama Lama community member, mother of three. Click each time of day to explore the cascading harm of diesel dependency.
Mary wakes before sunrise. The generator has been off all night to save fuel.
Children navigate the house in the dark — a trip hazard. They arrive late for school. The morning becomes a stressful scramble with no hot water and no light.
24/7 solar and battery power means lights, fans, and appliances work from the moment anyone wakes. No generator noise. No darkness. No late starts.
The generator is switched on for a limited midday window to run the refrigerator.
Food spoilage is a constant risk. Fuel costs $8–12 per day. Every hour of generator use is a calculated financial decision the family can barely afford.
Cold storage gets a dedicated 15 kWh sub-array. The refrigerator runs continuously. Food security is no longer contingent on fuel cost or availability.
School finishes. Children come home to do their afternoon homework.
No WiFi. Devices cannot be charged reliably. Educational content requiring internet access is simply unavailable. Children fall behind peers in grid-connected areas.
The school node includes dedicated WiFi access. Afternoon solar generation is at its peak — ample power for devices, internet, and study every day.
The generator has been shut down for the evening to preserve fuel for morning.
Medical devices including CPAP machines for sleep apnoea will not run. For community members who depend on these devices, every night without power is a genuine health risk.
The 120 kWh battery bank provides 48 hours of autonomy. Medical devices run all night. The clinic is always-on — health is never compromised by energy availability.
Generator noise has stopped, but tropical heat does not relent overnight.
Without fans or air circulation, nighttime temperatures make sleep difficult and contribute to ongoing health problems. Poor sleep compounds every other challenge the next day.
Battery discharge powers fans throughout the night. No generator noise. Cooler, quieter, healthier sleep. The system silently recharges from solar from dawn onwards.
Seven concepts scored across six PESTEL-derived weighted criteria. Option F★ — the shared community microgrid — scored 4.5/5, the clear winner.
| Criterion (Weight) | A. Diesel | B. Solar Only | C. Solar+Bat | D. Solar+Bat+Diesel | E. Wind-Solar | F. Community Grid ★ Winner | G. Household Kits |
|---|---|---|---|---|---|---|---|
| Reliability (25%) | 3 | 3 | 3 | 5 | 3 | 5 | 2 |
| Affordability (20%) | 2 | 3 | 4 | 3 | 2 | 4 | 4 |
| Maintainability (20%) | 2 | 3 | 4 | 4 | 2 | 5 | 3 |
| Env. Resilience (15%) | 2 | 4 | 4 | 4 | 3 | 4 | 3 |
| Community Ownership (10%) | 1 | 3 | 3 | 3 | 3 | 5 | 4 |
| Regulatory Ease (10%) | 3 | 3 | 3 | 3 | 2 | 3 | 3 |
| Weighted Total | 2.2 | 3.1 | 3.5 | 3.8 | 2.5 | 4.5 ★ | 3.0 |
Option F★ — Shared Community Solar-Battery-Diesel Hybrid Microgrid. Click any component for detailed specifications.
Select a component or load node to see design specifications and rationale.
Panels and batteries added in stages as budget and grants allow. Start with Stage 1 (20 kWp + 60 kWh), expand to full system as grant tranches are confirmed.
IP65+ enclosures, continuous gasket channel, 50°C wall tolerance. Cyclone-rated mounting to AS/NZS 1170.2 Region C. Armoured pest-proof conduits throughout.
Elders involved at every stage. Front panel labelled in Lamalama language. Slide-out battery modules require no tools. 3-day training program for local technicians.
Health clinic is a priority load — never shed regardless of battery state. Medical devices, medication refrigeration, and emergency lighting guaranteed 24/7.
Satellite-connected energy dashboard gives the community real-time visibility of generation, storage and consumption in plain language, co-designed with elders.
Drag the slider to simulate different battery charge levels and see the auto-failover sequence respond in real time. This logic was validated via an Arduino circuit on Tinkercad.
Diesel costs rise year-on-year. Microgrid O&M declines. Hover any year for exact figures.
The physical enclosure from the presentation — pole-mounted, IP65-rated, cyclone-proof. Drag to rotate. Click components to inspect.
Click any component on the model — or use the feature cards below — to read its full design specification.
3mm+ wall thickness, continuous gasket channel, rated to 50°C. Prevents dust, moisture, and tropical wildlife ingress from damaging circuitry.
Solar → Battery → Diesel priority with LED status indicators per source. Co-designed in Lamalama language. Replaceable in under 60 seconds.
Slide-out LiFePO₄ module — no tools required. A trained community technician can swap it in the field during wet season without specialist assistance.
15° gusset brackets with M8 bolt pattern meeting AS/NZS 1170.2 Region C cyclone uplift resistance. Elevated above flood and feral animal reach.
Pest-proof armoured cable entry. Prevents feral pigs and rodents tracking along conduits into the enclosure — a documented tropical remote failure mode.
Cape York receives ~5.5 kWh/m²/day. Drag the time slider to see how generation, battery state, and load change across a typical day at Port Stewart.
In Aboriginal tradition, songlines are paths that connect Country, community and spirit. Our microgrid follows the same principle — energy pathways connecting the community, honouring Country, flowing from the land itself. Hover the cards to explore.
In dot-art tradition, concentric circles represent a waterhole — life-giving, central, communal. The 40 kWp solar array is the community's waterhole: the source from which all energy flows.
The 120 kWh LiFePO₄ battery bank is the energy meeting place — where generation and consumption meet, and the community's resilience is stored between sun and night.
The U-shape in Aboriginal art represents a person seated at Country. Five load nodes — homes, clinic, school, cold storage, workshop — surround the shared energy source.
Paired dots represent animal tracks and travel paths. Our armoured conduits follow the same principle — pathways carrying energy safely across Country to every dwelling.
Some circles mark sacred, protected sites. The health clinic is our sacred site — always powered, never shed, protected regardless of battery state.
Total gross capital ~$316K, reduced to ~$158K net through an estimated 50% ARENA grant offset. O&M funded through four sources from Year 1.
| Solar PV Array (40 kWp) | $72,000 |
| LiFePO₄ Battery (120 kWh) | $96,000 |
| Hybrid Inverter & Controls | $28,000 |
| Diesel Backup Generator | $22,000 |
| Civil & Electrical Installation | $45,000 |
| Training & Commissioning | $12,000 |
| Contingency (15%) | $41,250 |
| Total Gross Cost | ~$316,250 |
| ARENA Grant (est. 50%) | −$158,000 |
| Net Community Cost | ~$158,250 |
Click each risk to expand the full analysis. These risks are mitigated and managed — not eliminated. Ongoing community training and monitoring are essential.
Solar and battery systems require ~$316K gross capital. Without external funding this is not viable for a remote community with limited financial resources.
ARENA and QLD grants estimated to offset 50%, bringing net community cost to ~$158K. Staged modular rollout spreads capital requirements. Community co-op model funds long-term O&M sustainably.
Port Stewart roads become inaccessible for months during the wet season. Any fault requiring specialist labour could leave the community without power for an extended period.
2–3 trained local technicians permanently on-site. Critical spare parts stocked locally. Modular slide-out components require no specialists and no tools to replace.
Cyclones (cf. Cyclone Narelle), humidity above 80%, saltwater corrosion, and feral pig damage to conduits and cabling are all real ongoing threats to system integrity.
IP65+ enclosures with continuous gasket channel. Cyclone-rated mounting to AS/NZS 1170.2 Region C. Armoured pest-proof conduits. Corrosion-resistant materials throughout.
Lithium batteries carry a low but non-zero fire risk, particularly if physically damaged, incorrectly installed, or subject to thermal runaway in extreme heat conditions.
LiFePO₄ chemistry selected specifically for its thermal stability vs NMC. Battery enclosure rated to AS/NZS 5139. BMS with thermal cutoff. Enclosure sited away from all dwellings.
A phased rollout from preliminary design to operational microgrid — staged to match grant funding availability and community readiness.
| Phase | Months 1–3 | Months 4–6 | Months 7–9 | Months 10–12 | Year 2 |
|---|
Hold yarning circles with Lama Lama elders and residents. Document Free, Prior and Informed Consent before any construction. Co-design the Lamalama-language energy dashboard and community energy co-op governance structure. This phase is non-negotiable and cannot be shortened.
Submit concurrent applications to ARENA and QLD DRDMW. Engage a qualified electrical engineer to finalise system sizing, site layout, and AS/NZS 4777 and NMI wiring compliance documentation. Estimated 50% ARENA grant offset reduces net community cost to approximately $158,000.
Procure all components during dry season when road access to Port Stewart is reliable. Pre-assemble and test microgrid node enclosures and auto-failover sequence off-site. Stock critical spare parts on-site before installation begins. Train local technicians in parallel.
Install Stage 1 (20 kWp solar, 60 kWh battery) during dry season. Commission satellite dashboard. Stage 2 expansion to the full 40 kWp and 120 kWh system follows once Stage 1 is validated and next grant tranche confirmed in Year 2.
Understanding the Lama Lama people's context, priorities and needs was foundational to every design decision.
The Lama Lama people are the Traditional Owners of a large area of Cape York Peninsula in far-north Queensland. Approximately 250 people live at the outstation of Port Stewart — a remote coastal location accessible only by unsealed roads impassable in the wet season, or by light aircraft.
Community self-determination is paramount. The Lama Lama people have maintained governance over their Country for thousands of years. Energy reliability directly supports health outcomes, educational participation, food security through cold storage, and the cultural practice of remaining on Country rather than relocating for services.
Cape York's high solar irradiance (~5.5 kWh/m²/day) makes solar generation highly viable. ARENA and QLD Government programs are actively funding exactly this type of project. Community-owned renewable energy has demonstrated transformative outcomes for other Indigenous communities — reducing costs, creating local employment, and strengthening ties to Country.
Elders lead. No design decision finalised without elder consultation and documented consent.
Language matters. Control panel and dashboard co-designed in Lamalama language with community input.
Local ownership. Community energy co-op model gives Lama Lama people full governance and ownership.
Local skills. 2–3 community technicians trained — wet season closures make external contractors unviable long-term.
ILUA compliance required before any ground works. All construction on Lama Lama Country requires formal agreement with the community as Traditional Owners.
Free, Prior and Informed Consent documented and signed by community representatives before any construction commences.
Full compliance with electrical standards for inverter systems and battery energy storage installations throughout.
All claims on this website are evidenced by peer-reviewed, government, and industry sources. APA 7th Edition formatting.
Australian Renewable Energy Agency. (2023). Microgrids: Cheaper, cleaner, more reliable energy for remote communities. ARENA. https://arena.gov.au/blog/microgrids-cheaper-cleaner-reliable-energy-for-remote-communities/
Australian Renewable Energy Agency. (2025). Off-grid projects. ARENA. https://arena.gov.au/projects/?technology=off-grid
Engineers Without Borders Australia. (2025). Port Stewart, Lama Lama. EWB Challenge. https://ewbchallenge.org/challenge/port-stewart-lama-lama/
RenewEconomy. (2023). Queensland spends $28m to get four remote communities off diesel for good. RenewEconomy. https://reneweconomy.com.au/queensland-spends-28m-to-get-four-remote-communities-off-diesel-for-good/
SolarTech. (2025). Solar battery lifespan & degradation: Complete guide. SolarTech Online. https://solartechonline.com/blog/solar-battery-lifespan-degradation-guid/
The University of Sydney. (2021). Renewable energy and empowering Indigenous communities. Sydney Environment Institute. https://www.sydney.edu.au/sydney-environment-institute/news-analysis/news/2021/12/16/renewable-energy-and-empowering-indigenous-communities.html
Queensland Government. (2023). Remote area energy supply program. Department of Regional Development, Manufacturing and Water. https://www.rdmw.qld.gov.au/electricity/remote-area-energy-supply-raes-program
Standards Australia. (2020). AS/NZS 4777.1:2016 — Grid connection of energy systems via inverters. SAI Global. https://www.saiglobal.com
Clean Energy Council. (2023). Community energy: A guide for regional and remote communities. Clean Energy Council. https://www.cleanenergycouncil.org.au/resources/communities
Commonwealth of Australia. (2018). Free, Prior and Informed Consent and extractive industries: A guide for Aboriginal and Torres Strait Islander peoples. Australian Human Rights Commission. https://humanrights.gov.au/our-work/aboriginal-and-torres-strait-islander-social-justice/publications
Supporting artefacts, raw data, and supplementary materials referenced throughout this design proposal.
LiFePO₄ batteries have a lifespan of 2,000–4,000 cycles (approximately 10–15 years). End-of-life disposal must comply with relevant waste regulations. The community co-op model should establish a battery replacement reserve fund from Year 1.
The modular AC-coupled architecture allows panels and batteries to be added without rewiring the full system. Stage 2 expansion from 20 kWp to 40 kWp can be executed independently based on grant funding tranches.
The satellite-connected smart metering hub creates the foundation for future community WiFi broadband, digital health monitoring, and remote learning platforms — extending impact beyond power provision alone.