Alice Hub PHES — Australia’s Continental Energy and Water Engine
40 GW of pumped hydro at 770 m head in the MacDonnell Ranges. A 32-day sovereign energy reserve. Up to 25,000 GL per year of water to southern Australia. The national endowment that turns sun waste into energy security, water security, and inland prosperity — simultaneously.
1. Not a Battery. A Continental System.
The Alice Hub Pumped Hydro Energy Storage system is the energy and water centrepiece of the SBC programme. It is not a conventional pumped hydro plant scaled up. It is a continental-scale system that operates simultaneously as the world’s largest energy storage facility, the world’s largest flexible grid load, and the continental water reservoir delivering water security to inland and southern Australia.
The system uses seven gorge pairs in the MacDonnell Ranges — natural high-head storage sites identified in the ANU STORES atlas — as upper reservoirs, with lower reservoirs constructed at the base of each gorge. The 770 m head differential between upper and lower reservoirs drives the turbine-generators in discharge mode and defines the energy density of the storage system.
Water arrives at Alice from the north via the MMC-VA Level 2 aqueduct corridor — a 17 m × 10 m sealed pressurised conduit running the full Darwin–Alice corridor, powered by excess solar generation from the corridor’s HVDC system. Water is distributed south and east from Alice by gravity, through the same conduit system in open-channel mode, to southern farmers, inland towns, and corridor communities.
In 1938, John Bradfield proposed diverting Queensland coastal rivers inland to water the continent. The MacDonnell gorges are exactly the storage sites the Bradfield Scheme lacked — natural high-head reservoirs ready to receive continental-scale water flows. The SBC programme builds the Bradfield vision using 21st century technology: solar power, the MMC-VA corridor, and PHES turbines instead of steam pumps and open canals.
2. The System at a Glance
| Parameter | Value | Notes |
|---|---|---|
| Total storage volume | 16,000 GL | Across 7 gorge pairs (A–G) in MacDonnell Ranges |
| Average head | 770 m | Between upper gorge reservoir and lower reservoir |
| Energy storage (programme-locked) | ~30,886 GWh | At 770 m avg head, 80% round-trip efficiency, average operating conditions |
| Generation capacity | 40 GW | All 7 gorge pairs at full output |
| Full discharge duration | 32 days | At 40 GW continuous generation |
| Normal pump load | 15–20 GW | Excess solar absorption — grid stabilisation |
| Aqueduct design flow | 340 m³/s | 17 m × 10 m conduit at 2.0 m/s design velocity |
| Annual throughput (base) | ~10,730 GL/year | Continuous design flow |
| Annual throughput (with flood harvest) | 15,000–25,000+ GL/year | Northern and inland diversion system active |
| Turbine type | Francis reversible | Standardised across all 40 GW — bulk procurement, simplified maintenance |
| Fast response BESS alongside | 500 GWh | Lithium — sub-second response; PHES handles sub-minute and beyond |
| Total marginal capex | ~$29–53B | All 4 phases — full continental system |
| Levelised storage cost | ~$1.33/kWh | vs Snowy 2.0 ~$34/kWh — 25× cheaper per kWh |
3. The Aqueduct — MMC-VA Level 2
Water reaches Alice Hub via the MMC-VA Level 2 aqueduct — the second deck of the Big Bertha five-level viaduct, a 17 m × 10 m sealed pressurised conduit running the full Darwin–Alice corridor. This is not a dedicated pipeline. It is an integrated service deck on the MMC-VA structure, sharing the corridor’s structural system, maintenance access, and HVDC power supply.
| Parameter | Specification | Notes |
|---|---|---|
| Conduit cross-section | 17 m × 10 m = 170 m² | Full MMC-VA corridor width and 10 m depth |
| Design velocity | 2.0 m/s | Conservative — limits erosion and head loss |
| Design flow rate | 340 m³/s | At 2.0 m/s through 170 m² section |
| Annual throughput (design) | ~10,730 GL/year | Continuous flow — significantly exceeds Alice Hub fill rate |
| Pumped mode (north → Alice) | Sealed pressurised | Powered by corridor HVDC — excess solar at zero fuel cost |
| Gravity mode (Alice → south) | Open channel | Lid panels removed — gravity flow at corridor slope |
| Pump power required | ~2.92 GW | At 743 m total dynamic head (500 m static + 243 m friction) |
| Pump stations | ~25–40 stations | Every 50–100 km; co-located with MMC-VA corridor; HVDC powered |
| Pumping hours/day | 6–10 hrs excess solar | Part-time pumping sufficient — gorge storage is the buffer |
The conduit does not need to pump continuously. The gorge pairs are the buffer. When solar is generating excess power — typically 6–10 hours per day in central Australia — the pumps run at full capacity. The gorges absorb the daily inflow. The PHES turbines can discharge at 40 GW at any time, day or night, independent of pumping. The conduit is the tap; the gorges are the tank.
4. Northern and Inland Flood-Harvesting Diversion System
The base aqueduct design delivers 10,730 GL/year. The Flood-Harvesting Diversion System can more than double this by capturing excess wet-season flows that currently run to the sea or spread across floodplains with no capture. The design principle is explicit: flood harvest only — capture excess peaks without affecting normal river ecology, base flows, ecosystem function, or cultural water rights.
| Component | Detail |
|---|---|
| Northern corridor branches | 3 branches capturing wet-season surplus from northern river systems |
| Inland river off-takes | 6–10 targeted captures from inland river systems during flood peaks |
| Structures | 12–18 low-impact weirs, buffer storages, and pump stations |
| Construction integration | Built in parallel with MMC-VA corridors using the same heavy-lift logistics |
| Cultural and ecological protection | Base flows, ecosystems, and cultural rights fully protected — flood harvest only |
4.1 Water Throughput Sensitivity
| Scenario | Annual throughput | Conditions |
|---|---|---|
| Base (aqueduct only) | 10,730 GL/year | Continuous design flow — no flood harvesting |
| Moderate (3 northern corridors) | 15,000–17,000 GL/year | Northern wet-season capture active |
| Optimised (full system) | 20,000–25,000+ GL/year | All northern and inland captures active in good wet season |
At 25,000 GL per year, Alice Hub delivers more water than the entire current Murray-Darling annual flow — drought-proofing southern agriculture, enabling new agrivoltaic development across 13.4 million hectares, and refilling the inland river systems that have run dry under a century of over-allocation.
5. Energy Storage — The Physics
5.1 How Much Energy Is Stored
The theoretical energy content of 16,000 GL at 770 m average head is approximately 120,859 GWh. At 80% round-trip efficiency (pump-up then generate-back), usable storage at maximum fill is approximately 96,687 GWh. The programme-locked figure of ~30,886 GWh represents average operating conditions — the system is not always full, and effective average head varies with fill level across the seven gorge pairs.
| Phase | Storage volume | Usable energy | Notes |
|---|---|---|---|
| Phase 1 (commissioned) | 200 GL | ~386 GWh | Immediate grid contribution on commissioning |
| Phase 2 | 6,600 GL | ~12,742 GWh | Exceeds Snowy 2.0 total target (350 GWh) |
| Phase 3 | 12,400 GL | ~23,928 GWh | Continent-scale sovereign energy reserve |
| Phase 4 (full system) | 16,000 GL | ~30,886 GWh avg | 32 days at 40 GW — world record by every metric |
5.2 Discharge and Refill
| Scenario | Power output | Duration | Notes |
|---|---|---|---|
| Full discharge | 40 GW | ~32 days | All 7 gorge pairs at maximum output |
| Normal discharge | 20 GW | ~64 days | Half capacity — routine grid support |
| Phase 1 only | 2.5 GW | ~26 days | First gorge pair commissioned |
| Frequency control | 0–40 GW | Seconds | Sub-minute response with BESS support |
| Black start | ~500 MW | Indefinite | Grid restart — no external power needed |
| Refill scenario | Pump power | Full refill time | Notes |
|---|---|---|---|
| Normal solar excess | ~15–20 GW | ~65–86 days | Seasonal — summer solar peak fills gorges |
| Maximum pumping | ~40 GW | ~31 days | Emergency mode — all capacity pumping |
| Aqueduct continuous top-up | ~2.92 GW | ~545 days | Northern water continuously replenishing via conduit |
6. Dual Purpose — Energy and Water Together
The Alice Hub PHES operates simultaneously as an energy storage system and a continental water distribution hub. These two functions are complementary, not competing. Water pumped uphill stores energy. Water released downhill generates energy. Net water delivered southward provides continental water security.
| Mode | Grid function | Water function |
|---|---|---|
| Charging (pumping) | Absorbs excess solar generation — prevents curtailment, stabilises frequency | Accumulates continental water reserve in gorge system |
| Discharging (generating) | Dispatchable firm power — any time, day or night, black start capable | Net water moves downhill — available for southern distribution |
| Water export (gravity) | None — gravity flow uses no power | Delivers water to southern farmers, inland towns, Murray-Darling |
| Frequency control | Primary frequency response — continental grid anchor | Minimal water movement at frequency control timescales |
| Baseload generation | Firm baseload — fills gap when solar and wind are low | Slow managed drawdown — maintains minimum reserve |
6.1 Where the Water Goes
| Destination | Volume | Benefit |
|---|---|---|
| Alice Springs and region | ~10–20 GL/year | Permanent water security for central Australia |
| Inland corridor towns (MMC-VA) | ~50–100 GL/year | Water supply for 200 corridor towns along the viaduct route |
| Southern farmers (SA/NSW/VIC) | Hundreds to thousands GL/year | Irrigation, drought-proofing, new cropping areas |
| Murray-Darling connection | Environmental flows TBD | Inland river system regeneration via Lake Eyre basin connections |
| Agrivoltaic zones (13.4 M ha) | Distributed tap-off | Water for solar farm agrivoltaic agriculture along corridor |
7. Phased Build Schedule and Capex
| Phase | Timeline | Scope | Capacity | Est. Capex | Key milestone |
|---|---|---|---|---|---|
| Phase 1 | Years 1–5 | Gorge A + Northern Corridor 1 + initial diversions | 2.5 GW | $4–8B | First power + flood capture testing. Revenue from frequency market. |
| Phase 2 | Years 5–8 | Gorges B & C + Corridors 2 & 3 + inland Phase 1 | 15 GW total | $12–20B | Exceeds Snowy 2.0. Water export to SA begins. |
| Phase 3 | Years 8–12 | Gorges D & E + full inland captures | 30 GW total | $12–20B | World’s largest energy storage. Full HVDC integration. |
| Phase 4 | Years 12–15 | Gorges F & G + optimisation | 40 GW | $9–20B | 32-day reserve + maximum water security achieved. |
| Total | 15 years | Full continental system | 40 GW / 16,000 GL | $37–68B | $1.33/kWh — vs Snowy 2.0 ~$34/kWh |
The cost advantage is structural, not optimistic. Natural topography replaces deep tunnelling. Productised modular construction (standardised Francis reversible turbines across all 40 GW) enables bulk procurement and simplified maintenance. Corridor logistics built for the MMC-VA viaduct serve the PHES build simultaneously. Snowy 2.0 cost overruns trace directly to the deep-tunnel risks that Alice Hub avoids by design.
Phase 1 alone — $4–8B for 2.5 GW of firm dispatchable power — delivers comparable output to Snowy 2.0’s full capacity at 10–20% of Snowy 2.0’s cost. Phase 1 justifies the entire programme. Each subsequent phase adds capacity at marginal cost with no additional infrastructure establishment cost.
8. World Scale Comparison
| Project / System | Power | Storage | Head | Duration | Notes |
|---|---|---|---|---|---|
| Alice Hub PHES (proposed) | 40 GW | ~30,886 GWh | 770 m | 32 days | World record — all categories |
| Fengning, China — world #1 PHES | 3.6 GW | 40 GWh | 425 m | ~11 hrs | Alice Hub = 11× power, 770× storage |
| Snowy 2.0, Australia | 2.0 GW | 350 GWh | ~700 m | ~7 days | Alice Hub = 20× power, 88× storage |
| Bath County, USA | 3.0 GW | ~24 GWh | 385 m | ~8 hrs | Largest US plant |
| Gordon Dam, Tasmania | 0.43 GW | 12 GWh | 140 m | ~28 hrs | Largest existing Australian PHES |
| All global PHES combined (2025) | ~200 GW | ~9,000 GWh | Various | Various | Alice Hub = 20% of world total power; 3.4× world total storage |
| Tesla Megapack Hornsdale (SA) | 0.15 GW | 0.19 GWh | N/A | ~1 hr | Benchmark BESS — Alice Hub = 163,000× storage |
The comparison table does not fully communicate the scale differential. Alice Hub at 30,886 GWh is not a larger version of existing PHES plants. It is a categorically different class of infrastructure — measured in days of national grid supply rather than hours. At 32 days of continuous 40 GW output it is a sovereign energy reserve, not a grid balancing tool. No other country has built anything remotely comparable.
9. If Not This, Then What?
Every energy policy involves a choice. The comparison below uses the same timeframe and comparable capital to show what Australia gets from each path.
| Option | Energy duration | Water delivery | Capex efficiency | First power | 2050 outcome |
|---|---|---|---|---|---|
| Alice Hub + MMC | 32 days | 15k–25k+ GL/yr | $1.33/kWh | 5 years | Transformed nation |
| 4-hour batteries | 2–4 hours | None | Higher per kWh | 1–2 years | Peak shaving only |
| Additional Snowy-style PHES | Long | Minimal | ~$34/kWh | 10–15 years | Incremental gains |
| Nuclear | Rigid baseload | Consumes water | $250–400B+ | 15–20+ years | Too slow |
| Gas + imports | Short | None | Volatile pricing | 3–5 years | Status quo dependency |
Alice Hub + MMC delivers multi-purpose outcomes — energy, water, agriculture, jobs, defence, AI hosting — in the same timeframe and with comparable capital as today’s fragmented approach. The alternatives solve one problem at significant cost. Alice Hub solves five simultaneously.
10. The Sovereign Dividend — What Australia Gets
Alice Hub is a high-multiplier national platform. Benefits compound across energy, water, economy, society, and strategy. Direct financial returns include energy sales, frequency control and inertia services, water delivery contracts, and AI hyperscale take-or-pay arrangements — targeting 8–12% inflation-hedged returns appropriate for superannuation fund investment.
10.1 Energy Security
Cheap firm power for the continental grid. A 32-day sovereign energy reserve — meaning Australia can run its grid for over a month with zero sun and zero wind before the reserve is exhausted. Primary frequency response and black-start capability anchoring the continental grid. Elimination of the baseload gap that has plagued the renewable transition.
10.2 Water and Agriculture
Drought-proof water supply to the Murray-Darling system — protecting an estimated $22B+ of annual agricultural GDP. New desert food bowl enabled by agrivoltaic development across 13.4 million hectares along the corridor. Permanent water security for Alice Springs, central Australian communities, and 200 corridor towns. Inland river system regeneration via Lake Eyre basin connections.
10.3 Economic and Industrial
AI hyperscale compute hosting — Australia’s cool nights, renewable power, and massive water supply for cooling make Alice Hub the natural site for Asia-Pacific data centre infrastructure. Manufacturing renaissance enabled by cheap firm power. Inland towns revived by corridor activity, water access, and agrivoltaic farming. Transport corridor efficiencies from the MMC-VA viaduct itself.
10.4 Indigenous Sovereignty
A 2.5% gross revenue royalty paid into a Sovereign Wealth Fund governed by Traditional Owners. Free base-load power to remote communities — eliminating diesel dependency. New education and health infrastructure co-located with corridor facilities. Co-design with Arrernte Traditional Owners as an essential precondition for any development — not an afterthought.
10.5 Strategic and Defence
Defence logistics backbone for central Australia — the MMC-VA corridor is a strategic asset for fuel, water, and rapid equipment movement. Reduced fuel import dependency. Australia as Asia-Pacific energy bridge — exporting sovereign renewable power and AI compute to regional partners. Space and observatory capabilities along the corridor spine.
11. The Gorge Pairs — Seven Sites
Seven gorge pairs in the MacDonnell Ranges (both West and East MacDonnell) provide the upper reservoir storage. Each pair consists of a natural gorge pound dammed at the outlet as the upper reservoir, and a constructed lower reservoir at the base of the gorge. The 770 m head differential between upper and lower water levels drives the turbine-generators.
Specific gorge names are withheld from public documents as defensive prior art protection. The ANU STORES atlas (2018) identified 1,547 potential pumped hydro sites in the Northern Territory, with many sites in the Alice Springs region offering 200–500 m+ heads. The MacDonnell Ranges consistently offer the highest available heads in central Australia — steep quartzite walls requiring minimal dam height to impound significant volumes.
| Parameter | Per gorge pair (average) | Total system (7 pairs) |
|---|---|---|
| Storage volume | ~2,286 GL | 16,000 GL |
| Upper reservoir | Natural gorge pound — dammed outlet | 7 upper reservoirs |
| Lower reservoir | Constructed — base of gorge | 7 lower reservoirs; concrete-faced rockfill |
| Generation capacity | ~5.7 GW | 40 GW |
| Head | ~770 m avg | ~770 m system average |
| Turbine type | Francis reversible | Standardised across all 40 GW |
12. Key Engineering Considerations
| Issue | Impact | Resolution path |
|---|---|---|
| Gorge geology and seismicity | Central Australia has low but non-zero seismic risk; gorge wall stability under reservoir loading | Geotechnical investigation — bore logs, seismic survey per gorge site |
| Evaporation losses | Central Australian pan evaporation 2–3 m/year — open reservoir loses 5–15% annually | Prefer narrow deep gorges; floating covers on lower reservoirs; include in water budget |
| Aboriginal cultural heritage | MacDonnell gorges hold deep Arrernte cultural significance — most within Tjoritja National Park | Co-design process with Traditional Owners — essential precondition for any development |
| Reversible pump-turbine procurement | 40 GW of reversible pump-turbines is 11× the world’s largest existing installation | International procurement staged across 4 phases — each phase uses proven technology |
| Conduit friction losses | 243 m friction head adds 33% to pump power over 2,000 km | Detailed hydraulic model — booster station spacing, pressure management |
| Environmental flows | Southern water delivery must consider ecological requirements of inland rivers | Environmental flow assessment — Lake Eyre basin, Murray-Darling connections |
| Net water delivery volume | Actual annual delivery depends on pumping hours, evaporation, agricultural demand | Full water balance model — inflow, storage, evaporation, demand, export |
13. The Physics Are Fixed
Australia possesses the sun, the gorges, the corridors, and the savings pool. These are not policy choices — they are geography. The MacDonnell Ranges were carved by geology over hundreds of millions of years into exactly the shape required for high-head pumped hydro storage. The central Australian solar resource is the most abundant on earth. The water that floods northern Australia every wet season and runs to the sea is available for capture without affecting base flows or ecological function.
Alice Hub + MMC turns these fixed physical facts into a continental endowment that solves energy, water, and economic security simultaneously — in the same timeframe and with comparable capital as today’s disconnected programme of batteries, gas peakers, and desalination plants that each solve one problem at high cost.
Recommendation: Proceed with Phase 1 detailed feasibility and secure initial superannuation and AI pre-commitments immediately. Phase 1 alone — 2.5 GW of firm dispatchable power at $4–8B — is a standalone investment case. The rest of the programme follows from Phase 1’s proof of concept.