Alice Hub
The continental water and energy engine. Water arrives from the north via the MMC-VA “Big Bertha” five-level viaduct aqueduct deck. It is stored in the MacDonnell Ranges gorge pairs at 770 m head. It generates 40 GW of firm despatchable electricity on demand. It flows south by gravity to the continent. This is what the Sovereign Build Corporation is built around.
1. The Vision — What the MMA Programme Is Building
Modern Movement Australia is the political and policy vehicle. The Sovereign Build Corporation is the entity that builds. Alice Hub is the SBC programme’s central node: the place where northern water arrives, is stored at high elevation, generates electricity on demand, and is distributed by gravity to the continent.
The MMA vision is direct: Australia has the sun, the gorges, the water, and the corridor routes. What it has lacked is the organisational and financial architecture to build at continental scale. The SBC provides that architecture — a sovereign corporation with a 50-year mandate. Alice Hub is the hub that makes everything else possible. The renewable energy feeding the grid is generated along the corridors. The firm, despatchable electricity that backs up that generation comes from Alice Hub. The water that sustains AI campuses, corridor towns, and southern agriculture arrives at Alice Hub from the north. Every element of the continental system connects here.
2. The Geography — Why the MacDonnell Ranges
The MacDonnell Ranges are a series of parallel east-west quartzite ridges extending approximately 400 km west and 100 km east of Alice Springs. The steep-sided gorges carved by intermittent rivers through the quartzite walls are not incidental to the Alice Hub design. They are the design. Each gorge is a natural upper reservoir — steep quartzite walls requiring minimal dam height to impound significant volumes at 600–900 m above the Alice Springs plain.
The ANU STORES atlas (2018) identified 1,547 potential pumped hydro sites in the Northern Territory. The MacDonnell Ranges sites consistently rank among the highest-quality on the combination of head, volume, and constructability. The quartzite geology is ancient, stable, and dense — low-permeability rock requiring minimal treatment for reservoir sealing. Dam walls at the gorge outlets are relatively small structures because the gorge walls themselves do the impoundment. The dam is a plug at the gorge outlet, not a wall holding back water from an open plain.
| Parameter | Value | Notes |
|---|---|---|
| Total water storage | 16,000 GL | Across 7 gorge pairs in the MacDonnell Ranges |
| Average head | 770 m | Between upper gorge reservoir and lower reservoir |
| Usable energy storage | ~30,886 GWh | At 770 m head, 80% round-trip efficiency, average fill |
| Generation capacity | 40 GW | All 7 gorge pairs at full output |
| Full discharge duration | 32 days | At 40 GW continuous generation |
| Turbine type | Francis reversible | Standardised across all 40 GW — bulk procurement |
| Levelised storage cost | ~$1.33/kWh | vs Snowy 2.0 ~$34/kWh — 25× cheaper per kWh |
The gorges are within Tjoritja / West MacDonnell National Park and the East MacDonnell Ranges — country of the Arrernte people. Co-design with Arrernte Traditional Owners is not an afterthought. It is an essential precondition for development. The gorges hold deep cultural significance and the programme’s legitimacy depends on genuine partnership, with a 2.5% gross revenue royalty flowing into a Sovereign Wealth Fund governed by Traditional Owners.
3. The MMC-VA “Big Bertha” Aqueduct — Level 2
Water does not arrive at Alice Hub via a buried pipeline or open canal. It arrives via Level 2 of the MMC-VA “Big Bertha” five-level continental viaduct — the most heavily loaded structural deck on the most capable infrastructure platform ever designed for Australia, and the governing load case for the entire structure.
3.1 The MMC-VA Five-Level Structure
The MMC-VA “Big Bertha” is the continental expression of the Multi-Modal Corridors platform. Five service levels stack vertically on a dual-leg precast concrete pylon rising approximately 50 m from grade to top deck, deployed across the six SBC corridors of Phases 1, 2, and 3.
| Level | Height | Service | Description |
|---|---|---|---|
| Level 1 | 8 m | Freight rail | Three standard-gauge heavy freight tracks. Heaviest load, lowest to grade. |
| Level 2 | 17 m | Aqueduct — governing load | 17 m × 10 m sealed pressurised water conduit. ~4,250 t water per 25 m span — exceeds all other service loads combined. The dominant structural load case for the entire MMC-VA system. |
| Level 3 | 30 m | HVDC & services | High-voltage direct current transmission, fibre optic spine, service conduits. |
| Level 4 | 40 m | Hyperloop reservation | Vacuum tube passenger and freight guideway above the aqueduct for minimal vibration transfer. |
| Level 5 | 50 m | Maglev | High-speed maglev passenger rail. Top deck for cleanest aerodynamic environment. |
The water load at Level 2 — approximately 4,250 tonnes per 25 m span when the conduit is full — exceeds the combined load of all other services. Every structural element of the MMC-VA from the 4 m OD foundation caissons to the Level 2 cap beams is sized around the weight of water. The aqueduct is not a service added to a transport structure. The transport structure is designed around the aqueduct. → See: MMC-VA Big Bertha — multimodalcorridors.com
3.2 The Conduit Specification
| Parameter | Specification | Notes |
|---|---|---|
| Cross-section | 17 m × 10 m = 170 m² | Full corridor width, 10 m depth |
| Design flow 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 |
| Annual throughput (design) | ~10,730 GL/yr | Continuous flow |
| Annual throughput (flood harvest) | 15,000–25,000+ GL/yr | Northern and inland captures active — see Memo 14 |
| Pumped mode (north → Alice) | Sealed pressurised | Powered by corridor HVDC excess solar |
| Gravity mode (Alice → south) | Open channel or sealed | Near-zero ongoing energy cost |
| Pump power required | ~2.92 GW | At 743 m total dynamic head |
| Pump stations | 25–40 stations | Every 50–100 km, HVDC powered |
| Pumping hours per day | 6–10 hrs | Excess solar window only — gorges buffer the rest |
The conduit does not pump continuously. The gorge pairs are the buffer. During the 6–10 hours per day when corridor solar generates excess power that would otherwise be curtailed, the pumps run at full capacity. The gorges absorb the inflow. The PHES turbines generate at any time — day or night, cloudy or clear — independent of pumping. The conduit is the tap. The gorges are the tank. The pump energy cost is zero — it is curtailed solar that would otherwise be wasted.
4. The Gorge Pairs — Seven Storage Vessels
Seven gorge pairs provide the upper reservoir storage. Each pair consists of a natural gorge pound dammed at the outlet as the upper reservoir, with a constructed lower reservoir at the base. The 770 m average head drives the Francis reversible turbine-generators in discharge mode and must be overcome by the pumps in storage mode.
| 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 — concrete-faced rockfill | 7 lower reservoirs |
| Generation capacity | ~5.7 GW | 40 GW |
| Average head | ~770 m | ~770 m system average |
| Turbine type | Francis reversible | Standardised — bulk procurement |
| Foundation depth | 4 m OD caisson, 20 m depth | Same production ring as all MMC foundations |
Specific gorge names are withheld from public documents as defensive prior art protection. The 4 m OD caisson foundation used for gorge dam structures is the same production unit as every other MMC foundation — 20 ring segments per leg rather than the Phase 0 planning assumption of 15, reflecting the additional aqueduct water load. The Megafactory produces rings at the same rate regardless of depth. Deeper foundations add cost through additional ring count, not through any change in manufacturing architecture.
5. Energy Storage — The Physics
5.1 How Much Energy Is Stored
Theoretical energy content of 16,000 GL at 770 m average head is approximately 120,859 GWh. At 80% round-trip efficiency, usable storage at maximum fill is approximately 96,687 GWh. The programme-locked figure of ~30,886 GWh represents average operating conditions across the seasonal fill and discharge cycle.
| Phase | Volume | Usable energy | Generation | Notes |
|---|---|---|---|---|
| Phase 1 | 200 GL | ~386 GWh | 2.5 GW | First gorge pair. Immediate grid contribution on commissioning. |
| Phase 2 | 6,600 GL | ~12,742 GWh | 15 GW | 36× Snowy 2.0’s entire target (350 GWh) |
| Phase 3 | 12,400 GL | ~23,928 GWh | 30 GW | Continental-scale sovereign energy reserve |
| Phase 4 | 16,000 GL | ~30,886 GWh | 40 GW | 32 days at 40 GW — world record by every metric |
5.2 Grid Function
Alice Hub is not a peaking plant. It performs every grid support function simultaneously:
- Baseload replacement. 40 GW of firm, despatchable generation replaces coal — available 24 hours a day regardless of weather.
- Frequency control. Francis turbines respond in seconds. A 500 GWh lithium BESS alongside provides sub-second response for the fastest grid events.
- Black start. Alice Hub restarts the continental grid from zero after a total blackout — no external power required.
- 32-day sovereign reserve. At 40 GW continuous discharge, Alice Hub supplies Australia’s entire current grid demand for 32 days with no solar, no wind, and no other generation. This is the physics of 16,000 GL at 770 m, not a design aspiration.
6. Water Distribution — What Leaves Alice Hub South
6.1 The Gravity Feed
Alice Springs sits at approximately 550 m above sea level. The Murray-Darling Basin lies at 100–200 m. Water stored in the MacDonnell gorge pairs at 770 m flows south and east by gravity through the same MMC-VA conduit that brought it north, in open-channel or lower-pressure mode. The pump stations reverse to valved bypass. The conduit becomes a gravity aqueduct running downhill toward South Australia.
The energy cost of gravity distribution is near zero. The pumping energy was expended once — moving water from the river to the corridor pipeline in the north, using curtailed solar that would otherwise be wasted. From Alice Hub south, physics does the work indefinitely. This is the economic logic that makes Alice Hub transformative: pump water uphill once at zero fuel cost, and it flows downhill to southern Australia forever.
6.2 The Distribution Cascade
As described in Memo 14, water leaving Alice Hub is distributed in priority order by value per kilolitre:
| Priority | User | Volume (approx.) | Delivery |
|---|---|---|---|
| 1st | AI data centre cooling | 1–3 GL/yr per 1 GW campus | Pressurised supply from Alice Hub lower reservoir to campus cooling towers |
| 2nd | Green hydrogen & solar farms | ~500 GL/yr at full hydrogen scale | Electrolysis water supply — purified from aqueduct feed |
| 3rd | Corridor towns — 211 communities | ~200–500 GL/yr total | Gravity-fed reticulation from corridor pipeline |
| 4th | Southern irrigation — Murray-Darling and beyond | Up to 20,000+ GL/yr at full system | Gravity flow south via corridor conduit |
The AI campus anchor revenue is what makes the southern irrigation viable. Without high-value commercial users funding the infrastructure, gravity-fed water to the Murray-Darling is a government subsidy programme that cannot justify its capital cost. With AI campus take-or-pay water contracts in place, the commercial cascade funds the infrastructure that delivers drought security to southern agriculture at a cost the farming sector can afford. The commercial users at the top of the cascade pay for the infrastructure that serves the community users at the bottom.
7. Alice Hub and AI Campus Co-location
Alice Hub — combining 40 GW of firm power, aqueduct water at industrial scale, the MMC corridor data spine, and the lowest electricity cost on the continent — is the natural home for Australia’s first inland AI hyperscale campuses. The three constraints shutting down data centre approvals globally — power, water, and land — are design features here.
Power at 4–7¢/kWh from corridor HVDC, backed by 30,886 GWh of firm storage. Water from the aqueduct at industrial rates — the constraint that has banned new data centres in Singapore and put Phoenix on water restriction. Land on Crown land in the Northern Territory. And the desert’s 3.9°C winter nights providing ORC waste heat recovery at 76–107 MW per GW of compute — an efficiency dividend that no tropical or coastal location can replicate.
The MMC-VA fibre spine connects Alice Hub to Darwin in approximately 1,500 km. From Darwin, the Inligo ACC-1 subsea cable (landing 2027–28) reaches Singapore in 23 ms one-way. A data centre at Alice Hub is, on fibre, closer to Singapore than GEO orbit is to anywhere on Earth. → See: The Power Imperative — MMA Memo 13.
8. World Scale Comparison
| Project | Power | Storage | Head | Duration |
|---|---|---|---|---|
| Alice Hub PHES (SBC programme) | 40 GW | ~30,886 GWh | 770 m | 32 days |
| Fengning, China — world #1 PHES | 3.6 GW | 40 GWh | 425 m | ~11 hrs |
| Snowy 2.0, Australia | 2.0 GW | 350 GWh | ~700 m | ~7 days |
| Bath County, USA | 3.0 GW | ~24 GWh | 385 m | ~8 hrs |
| All global PHES combined (2025) | ~200 GW | ~9,000 GWh | Various | Various |
Alice Hub 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. The world’s largest existing plant (Fengning) stores 40 GWh. Alice Hub stores 770 times more. All existing pumped hydro globally stores approximately 9,000 GWh. Alice Hub stores 3.4 times that combined total.
9. Engineering Considerations
| Issue | Impact | Resolution path |
|---|---|---|
| Gorge geology and seismicity | Low but non-zero seismic risk; gorge wall stability under reservoir loading | Site-specific geotechnical investigation — bore logs and seismic survey per gorge pair |
| 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 balance model |
| Arrernte cultural heritage | Profound Arrernte cultural significance — most gorges within Tjoritja National Park | Co-design with Traditional Owners — essential precondition, not consultation |
| Turbine procurement scale | 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 1,500 km | Hydraulic model — booster station spacing and pressure management |
| Environmental flows south | Gravity distribution must account for ecological flow requirements of southern rivers | Environmental flow assessment — Lake Eyre basin, Murray-Darling connections |
10. The SBC’s Central Node
Every element of the MMA programme connects through Alice Hub. Renewable generation runs along the corridors. Firm storage is at Alice Hub. Water harvest is in the north — described in Memo 14. Water delivery runs south from Alice Hub. AI campuses are powered and cooled here. Corridor towns are watered here. The Murray-Darling is drought-proofed from here.
The Sovereign Build Corporation — established by MMA policy — owns Alice Hub on behalf of all Australians. It is not a private asset. It is a sovereign endowment. Revenue from energy sales, water contracts, AI campus leasing, and frequency control services flows to Australian government accounts, to Traditional Owner sovereign wealth funds, and to the continued build of the continental system.
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 northern monsoon delivers water Australia currently loses to the ocean every wet season. The MMC-VA Big Bertha aqueduct moves that water south to where the gorges are waiting. Alice Hub is not an engineering project. It is the realisation of what the continent’s geography has always made possible.
11. Cost Breakdown
Alice Hub is a system of five capex components, each costed at the level of confidence consistent with Memo 19 — locked unit rates from the MMC catalogue where available, working estimates from the Phase 0 working document where MMC engineering is in progress, and explicit under-MMC-scoping flags where the detailed engineering has not yet been completed. All figures are 2026 AUD at 10–15% design maturity, the same maturity at which the HSRA Stage 1 business case was submitted.
11.1 PHES turbines, generators, dams and lower reservoirs
The pumped hydro generation and storage capex — the 40 GW of Francis reversible turbines, the seven dam plugs at the gorge outlets, the seven constructed lower reservoirs, and the associated mechanical and electrical balance-of-plant.
| Build phase | Capacity | Storage | Capex range | Years |
|---|---|---|---|---|
| Phase 1 — first gorge pair | 2.5 GW | 200 GL | $3–6 B | Yr 1–5 |
| Phase 2 — second + third pairs | 15 GW | 6,600 GL | $8–15 B | Yr 5–8 |
| Phase 3 — fourth + fifth pairs | 30 GW | 12,400 GL | $10–18 B | Yr 8–12 |
| Phase 4 — sixth + seventh pairs | 40 GW | 16,000 GL | $8–14 B | Yr 12–15 |
| Total PHES marginal capex | 40 GW | 16,000 GL | $29–53 B | 15-year staged build |
Confidence: LOCKED. Staged build figures locked across all SBC canonical documents. At $1.33/kWh levelised, this is 25× cheaper per kWh of storage than Snowy 2.0 — the cost advantage comes from natural gorge geology doing what concrete dams must otherwise construct from scratch, the same caisson foundation production unit as the corridor, and bulk-procured standardised Francis reversible turbines across all 40 GW.
11.2 MMC-VA trunk aqueduct — northern catchments to Alice Hub
The MMC-VA “Big Bertha” five-level viaduct carries Level 2 — the 17 m × 10 m sealed pressurised water conduit — from the northern wet-tropics catchments south to Alice Hub. Aqueduct distance from the northern catchments to Alice Hub is approximately 1,200–1,500 km depending on which capture systems feed the trunk and the exact routing.
| Item | Quantity | Unit rate | Capex range | Confidence |
|---|---|---|---|---|
| MMC-VA viaduct structure | ~1,200–1,500 km | $13.97 M/km | $16.8–21.0 B | LOCKED (MMC site rate) |
| Continental aqueduct conduit (Level 2) | ~1,200–1,500 km | $4–8 M/km | $4.8–12.0 B | Working estimate |
| Subtotal MMC-VA trunk pre-contingency | $21.6–33.0 B | |||
| Contingency 25–30% | $5.4–9.9 B | Standard at 10–15% design maturity | ||
| Total MMC-VA trunk capex | $27.0–42.9 B |
Confidence: viaduct structure LOCKED at MMC catalogue rate; aqueduct conduit on Level 2 is a working estimate pending detailed MMC engineering on the Aqueduct-VA cost page. Trunk routing distance is provisional and depends on which northern catchment systems are tapped and on which side of the continent the aqueduct trunk runs — resolved at Phase 1 SBC #2 corridor design.
11.3 Finger viaducts (MMC-VD) — northern river capture spurs
The MMC-VD finger viaduct is the single-leg single-level water-corridor structure that branches off the MMC-VA trunk to individual northern river capture systems. Each finger viaduct runs from the trunk aqueduct to a capture point on a major northern river — pump station, holding pond, water-treatment screen at the river, fish-passage works, monsoon-flood diversion gate.
The major northern wet-tropics catchments physically reachable by aqueduct system from Alice Hub include the Roper (NT), Daly (NT), Victoria (NT), Burdekin (QLD), Fitzroy (WA Kimberley), and Ord (WA Kimberley), among others. The Phase 0 working document specifies 30,000 GL/yr aggregate network throughput. Realising this at scale requires multiple capture systems. The number of finger viaducts and their individual lengths are under MMC scoping — the working assumption below uses indicative ranges typical of single-river capture systems.
| Item | Working assumption | Unit rate | Capex range | Confidence |
|---|---|---|---|---|
| Finger viaducts (MMC-VD) | ~5–7 capture systems, 50–200 km each — total 250–1,400 km | $2.11 M/km | $0.5–3.0 B | Length under MMC scoping; rate LOCKED |
| River capture works (per system) | ~5–7 systems | $200–500 M per system | $1.0–3.5 B | Under MMC scoping |
| Subtotal finger viaducts pre-contingency | $1.5–6.5 B | |||
| Contingency 25–30% | $0.4–2.0 B | |||
| Total finger viaducts capex | $1.9–8.5 B |
Confidence: MMC-VD unit rate of $2.11 M/km is locked at the MMC catalogue; finger viaduct lengths and river capture works are under MMC scoping pending detailed hydrological study and route design. Per-system capture works (pump station inlets, screens, fish passage, flood diversion gates) are sized to the individual river hydrology and require site-specific engineering.
11.4 Pump stations along the MMC-VA trunk
The MMC-VA Level 2 conduit operates in pumped mode from the northern catchments to Alice Hub, lifting water against approximately 743 m total dynamic head. Section 3.2 specifies 25–40 pump stations distributed along the trunk every 50–100 km, drawing total pump power of approximately 2.92 GW from corridor HVDC excess solar. Each station is sized at approximately 75–120 MW pumping capacity.
| Item | Quantity | Unit rate | Capex range | Confidence |
|---|---|---|---|---|
| Pump stations on MMC-VA trunk | 25–40 stations | $150–400 M per station | $3.75–16.0 B | Under MMC scoping |
| HVDC supply to pump stations (taps from corridor backbone) | 25–40 tap points | $30–60 M per tap | $0.75–2.4 B | Working estimate |
| Subtotal pump stations pre-contingency | $4.5–18.4 B | |||
| Contingency 25–30% | $1.1–5.5 B | |||
| Total pump stations capex | $5.6–23.9 B |
Confidence: pump station capex is the second-largest uncertainty in the Alice Hub cost stack, after the trunk aqueduct distance. The working assumption of $150–400 M per station is consistent with comparable large water-pumping infrastructure (Snowy 2.0 pumping plant, Murray-Darling regulation infrastructure, Israeli desalination return systems) but the MMC pumping cost page is in development — the detailed engineering work to lock the figure is pending.
11.5 AI campus co-location interfaces and southern distribution head works
Two additional capex items sit at Alice Hub itself: the AI campus cooling-water interfaces (described in Section 7) and the head works for southern gravity distribution (the valve manifolds, pressure-reducing infrastructure, and main outlets that release water to the southern corridor network described in Section 6).
| Item | Description | Capex range | Confidence |
|---|---|---|---|
| AI campus cooling-water interfaces | Pressurised supply from lower reservoirs to AI campus cooling towers | $0.5–1.5 B | Under MMC scoping |
| Southern distribution head works | Valve manifolds, pressure-reducing stations, main outlets for gravity-fed southern distribution | $0.5–1.5 B | Under MMC scoping |
| Operations control centre | SCADA, water-quality monitoring, dispatch control for 40 GW PHES + continental aqueduct | $0.2–0.5 B | Under MMC scoping |
| Total Alice Hub interface capex | $1.2–3.5 B |
11.6 Alice Hub total programme capex
| Component | Capex range | Reference |
|---|---|---|
| PHES turbines, generators, dams and lower reservoirs | $29–53 B | § 11.1 (Locked) |
| MMC-VA trunk aqueduct (northern catchments to Alice Hub) | $27–43 B | § 11.2 |
| Finger viaducts (MMC-VD northern river spurs) | $2–9 B | § 11.3 |
| Pump stations along the MMC-VA trunk | $6–24 B | § 11.4 |
| AI campus interfaces and southern distribution head works | $1–4 B | § 11.5 |
| Total Alice Hub programme capex | $65–133 B | 10–15% design maturity |
The Alice Hub programme is the largest single capex line outside the corridor build itself. The wide range reflects three real uncertainties: the trunk aqueduct distance (depending on which northern catchments are tapped), the number and individual cost of pump stations along the trunk, and the number and length of finger viaducts to individual river capture points. Each is named explicitly so that as MMC engineering progresses and Phase 0 working document hydrological work matures, the range tightens.
This figure replaces the previous “$29–53 B” Alice Hub line in the SBC programme rollup — that figure was the PHES marginal capex alone, not the integrated water-transport system. Memo 19 § 7 (the SBC programme rollup) references this memo for the full Alice Hub capex.
Confidence summary for Alice Hub: PHES generation and storage capex ($29–53 B) is locked. MMC-VA viaduct structure unit rate is locked. Aqueduct conduit, pump stations, finger viaducts, river capture works, AI campus interfaces and southern head works are all working estimates under MMC scoping. The Aqueduct-VA cost page and the Pumping cost page on multimodalcorridors.com/costs.html are the next pieces of MMC engineering work that will lock these figures.
This memo costs Alice Hub. It does not cost the corridors that radiate from Alice Hub south to Adelaide and east to the Murray-Darling — those distribution corridors are part of the SBC #1, #2, #3 corridor capex covered in Memo 19. The boundary is clean: Alice Hub is the head-works, storage system, and continental trunk aqueduct from the north. Everything south of Alice Hub is corridor build under Memo 19.