News

HUNTER POWER PROJECT – PLANNING MODIFICATION AMENDMENT

03/10/2024

Hunter Power Project (HPP) is set to begin operations in December 2024 with one generator running on diesel during the testing and commissioning phase.

The second unit and gas introduction will follow shortly, with full operations expected within a few months.

While the project’s planning modification has proposed increasing diesel operating hours to 1,100 per unit for 2025, Snowy Hydro does not currently expect HPP to operate entirely on diesel in 2025. The purpose of the modification is to provide for the current anticipated completion of the gas pipeline to March 2025 plus appropriate program contingency to ensure the power station can still generate energy in the event of any further delays to the gas pipeline or to the project’s commissioning program.

HPP’s gas pipeline is being delivered by APA Group and is independent of Snowy Hydro’s delivery of the power station.

Snowy Hydro has updated some of the information submitted to the NSW Department of Planning, Housing and Infrastructure. Previously some of the information was inaccurate and did not accurately reflect our intentions around contingency planning being one of the drivers of the modification.

Once fully operational, HPP will primarily run on gas, using diesel as backup. Gas remains crucial for meeting peak demand and supporting Australia’s renewable energy transition.

News

HUNTER POWER PROJECT DELIVERS LOCAL JOBS AND SKILLS

12/08/2024

Snowy Hydro’s Hunter Power Project (HPP) is leaving a lasting impact on the local workforce, delivering approximately 600 direct construction jobs and crucial skills development for a number of high-demand construction trades.

More than 60% of HPP workers live locally, which is part of Snowy Hydro’s commitment to supporting communities that the company is a part of.

The number of apprentices at HPP is on the increase, with Snowy Hydro working alongside principal contractor UGL to provide an additional 12 apprenticeship positions in June 2024, which includes three females and two First Nations apprentices. New apprentices on site include a boilermaker, nine electricians, and two mechanical fitters.

Snowy Hydro CEO Dennis Barnes said HPP will be good for jobs long after construction is complete.

“We are proud of our contribution to the construction, engineering, and infrastructure sector here in the Hunter, especially given the current tradespeople shortages in Australia.

“This project will have a lasting impact on the size and proficiency of the local workforce”

Mr Barnes said.

”A job on HPP will help set our team up for a rewarding career and a bright future.”

Electrical apprentice Daniel Battle said he became interested in the electrical trade after working as a Trades Assistant on the project.

“This apprenticeship is giving me the necessary skills, knowledge, and experience while working to a high standard within the industry to become an electrician,” Mr Battle said.

Apprentice boilermaker Jackson Scott said he was passionate about fabrication and welding. “I was very lucky to be offered an apprenticeship shortly after starting at HPP.

“HPP is preparing me to have a successful career contributing to important infrastructure in our country, and I’m extremely grateful,” Mr Scott said.

Electrical apprentice Camilla Lindeberg said she worked as a cleaner for seven months before applying for an apprenticeship.

“I never thought of being an electrical apprentice until the opportunity presented itself, and I’m excited for what the future holds.

“The challenge of learning something new and directly contributing to building HPP gives me a great sense of achievement and sets me up for a whole new career with endless opportunities,” Ms Lindeberg said.

Snowy Hydro is also looking to the future workforce through its community support programme.

In 2024, Snowy Hydro extended its Local School STEM Fund to the Cessnock LGA where HPP is located. More than $26,000 was awarded to schools in the area to foster learning opportunities and career pathways for local young people with a focus on STEM.

From left to right: Daniel Battle, Camilla Lindeberg, and Jackson Scott.

News

SNOWY HYDRO SIGNS LOCHARD GAS STORAGE AGREEMENT

15/07/2024

Snowy Hydro has entered into a 25-year gas storage agreement with Lochard Energy at the Iona underground gas storage facility to support Snowy Hydro’s gas fired generation fleet.

Australia’s energy market continues to experience significant change with the uptake of renewables and the progressive closure of coal fired assets. Snowy Hydro helps manage intermittency in the National Electricity Market (NEM) through its portfolio of power stations including the Snowy Scheme.

The long-term Lochard storage deal will allow Snowy Hydro to utilise stored gas when required to operate its gas fired power stations.

Snowy Hydro CEO Dennis Barnes said reliability and security of supply is central to the way Snowy Hydro operates, maintains and develops its nationally critical infrastructure.

“Snowy Hydro’s generating portfolio of hydro, pumping and gas fired power stations continues to support further deployment of renewables into the grid by “firming” intermittent generation sources into reliable power. The gas storage agreement with Lochard Energy will support the operation of our gas-fired power stations in Victoria.”

Lochard CEO Tim Jessen said Lochard welcomes the opportunity to strengthen its relationship with Snowy Hydro through the signing of the new Gas Storage Services Agreement.

“This important agreement will underpin Lochard’s Heytesbury Underground Gas Storage project through which we will further expand the Iona Gas Storage Facility to continue to provide critical energy storage services in Victoria.”

Gas storage is essential to ensure the supply of gas to meet peak electricity demand in seasonal markets, to supply gas to peak power generators including Snowy Hydro, and to ensure security of supply in the event of supply disruption.

Snowy Hydro owns and operates three gas-fired power stations, strategically located in the LaTrobe Valley and Laverton in Victoria, and at Colongra, NSW. With a current total generating capacity of 1,290 MW. Snowy Hydro is also constructing a 660MW gas fired power station at Kurri Kurri in the Hunter Valley.

The Lochard Energy gas storage agreement will commence in January 2028.

News

SNOWY 2.0 PROJECT UPDATE – APRIL 2024

01/05/2024

Snowy 2.0 is a major pumped-hydro expansion of the Snowy Scheme and at Marica, high in the Snowy Mountains, a very wide and deep surge shaft connecting to the Snowy 2.0 headrace tunnel is being built.

The surge shaft has two key purposes for the operation of a hydro power station: as a water storage and vacuum relief when the power station starts up, and to absorb the momentum of water movement within the headrace when the power station is shut down.

The Marica surge shaft is about 28 metres in diameter and is currently over 80 metres deep.

During its construction the walls of the shaft are supported temporarily by rock bolts and shotcrete and once it is excavated to its full depth of 250 metres, a permanent concrete lining will be installed from the bottom up.

We are excavating the shaft with a number of excavation methods, including using 36-tonne excavators that place loads of material into kibbles. This material is lifted out and dropped into a dump truck.

An integrated work platform and personnel hoist is in the final stages of commissioning to provide worker access now the shaft is becoming very deep.

In the latest project update, civil engineer and Snowy 2.0 project manager, Richard Clarke, details the significant work undertaken constructing Marica Trail to create a new permanent access road into the surge shaft site.

Marica Trail provides safe, all weather access for traffic, including heavy vehicles.

Building in steep terrain was challenging and required specialised rope access workers to install ground support for safety and stability.

The road has been very carefully constructed in a tight envelope. It’s 6.5 km long, with an elevation change of about 320 metres from top to bottom and multiple water crossings have been created, including over the Eucumbene River.

Over at Tantangara, drill and blast excavation to join the intake and gate shaft is underway from both structures. The transition from the intake changes shape as it is excavated to become the connection tunnel to the gate shaft.

At the same time, we have started drilling and blasting from the gate shaft to merge into the headrace tunnel alignment excavated by TBM Florence.

When completed, water will enter the headrace tunnel from the intake, on its way to the power station.

Snowy 2.0 is being engineered to deliver clean and reliable energy storage and generation for the next 150 years. The target date for commercial operation of all units is December 2028, with first power expected in the second half of 2027.

Update – Thursday 2 May

Reports today that tunnel boring machine (TBM) Florence has stopped tunnelling are incorrect.

TBM Florence remains fully operational and is now more than 800 metres into excavation of the Snowy 2.0 headrace tunnel at Tantangara. The TBM has operated successfully since its restart on 8 December 2023 and has moved through identified soft ground into hard rock.

The total distance tunnelled by all three Snowy 2.0 TBMs across the pumped-hydro renewable energy project is approximately nine kilometres.

As provided in evidence at two recent Senate Estimates hearings, Snowy Hydro has been investigating options to de-risk the headrace tunnel construction by excavating from the other end. This work remains ongoing.

News

SNOWY 2.0 PROJECT UPDATE – MARCH 2024

03/04/2024

This month we’ll update you on tunnel boring machine (TBM) Kirsten, which is putting Snowy 2.0 at the forefront of TBM tunnelling innovation, along with the unique concrete segments she will install as part of the inclined pressure shaft excavation and lining.

Damon Miller, Senior Engineering & Quality Manager for Snowy 2.0, works with the design, manufacturing and construction teams to plan and deliver the engineering solutions behind Snowy 2.0, the pumped hydro expansion of the Snowy Scheme.

Building the inclined pressure shaft (IPS) will be a unique and technically challenging engineering feat for the project team

After finishing the 2.9 kilometre Emergency Cable and Ventilation Tunnel, TBM Kirsten has been substantially modified for her next critical role excavating the IPS.

This very steep, 1.6 kilometre, 10 metre diameter shaft forms part of the waterway and will connect the headrace tunnel with the underground power station.

Project director Dave Evans believes the specially manufactured segments being used for this shaft are going to change the world of hydropower. “It means we can do less steel lining, we can move power stations closer to the surface which is what we’ve done here and construct an inclined pressure shaft with a tunnel boring machine which all makes it safer, quicker and the quality a lot better.”

To see the latest Snowy 2.0 project statistics, view the fact sheet here.

To cope with the extreme and fluctuating water pressures in the IPS, the concrete segment rings lining the tunnel require bespoke connectors.

The Force Activated Coupling System or FACS are specially-developed steel couplers with pin and socket elements.

When the segment rings are interlocked, the pre-stressed FACS keep the joint closed when the tunnel experiences sharp changes in pressure from turbine operations and shut downs. It’s like water hammer when opening or closing a tap at home, just on a much larger scale.

This new technology has been developed by Future Generation joint venture partner Webuild and their designer Lombardi, with the FACS segments being manufactured at our precast factory in Cooma.

A large-scale test is being conducted by installing eight FACS rings to link the emergency, cable and ventilation tunnel with the IPS.

Meanwhile, innovative design by the leading TBM manufacturer Herrenknecht has allowed TBM Kirsten to be modified to safely tunnel uphill.

The machine’s working platforms, equipment and operator’s cabins all pivot to remain horizontal and the walkways become steps and ladderways.

A screw conveyor will move excavated rock from the cutterhead. This feeds into a sandwich conveyor that has face-to-face rubber belts to hold the material so it can be transported down the steep slope without spillage.

The IPS is on a 47% incline so a monorail is being installed to transport workers and there is a rack and pinion system for multi-service vehicle access including segment delivery up the steep slope to the TBM.

News

100,000 SNOWY 2.0 TUNNEL SEGMENTS LOCALLY MANUFACTURED

29/02/2024

The Snowy 2.0 Cooma precast manufacturing facility has hit another significant milestone and completed production of 100,000 of the 130,000 concrete segments needed to line 27 kilometres of tunnels for the pumped-hydro megaproject.

More than 230,000m3 (or more than 550,000 tonnes) of concrete has been used to manufacture these seven-tonne precast segments, installed by the three tunnel boring machines (TBMs) used on the Snowy project.

Snowy Hydro CEO Dennis Barnes said it was pleasing for the project to be manufacturing and investing locally, while also providing employment opportunities.

“About 200 people from the 3,000-strong Snowy 2.0 workforce work at the precast factory operated by our project contractor Future Generation Joint Venture,” Dennis said. “The facility supports local employment and also on-the-job training for a number of school-based apprentices from Monaro High.”

The precast facility includes a concrete batching plant and onsite laboratory to check the quality of every segment produced. Many of the raw materials like aggregates are sourced from local quarries at Mt Mary and Nimmitabel.

Careful consideration and design of the concrete mix, which includes waste material, has meant significant reduction in the environmental production footprint while improving the segments’ durability and performance.

Carousels utilising robotics to automate the process of demoulding, cleaning and application of the release agent on the segment moulds have been used in the manufacturing process.

One of the two carousels has now been modified to produce the precast segments for the Snowy 2.0 inclined pressure shaft (IPS). This very steep 1.65km shaft will be excavated by TBM Kirsten and will link the underground power station with the headrace tunnel coming from Tantangara.

The IPS segments involve a world-first force-activated coupling system (FACS) designed to withstand the powerful internal forces of water moving through the 10-metre diameter inclined tunnel.

Installing segments with FACS eliminates the need for a second tunnel lining, thereby improving the quality, safety and the rate of tunnel completion.

The Snowy 2.0 precast factory will produce approximately 9,000 IPS segments, with nine used in each tunnel-lining ring. The first ring prototype has been completed, with mass production expected to start next month.

FAST FACTS

Number produced = 100,000

Concrete used = About 550,000 tonnes or 230,000 cubic metres

Segment weight = 7 tonnes

Installation method = tunnel boring machine

Equivalent rings (nine segments per ring) = 11,111

Tunnel lining length = 22.2 kilometres

News

SNOWY 2.0 PROJECT UPDATE – FEBRUARY 2024

28/02/2024

The new Snowy 2.0 power station will boast the latest in hydro technology, delivered by our expert subcontractor Voith Hydro. In the latest project update, Snowy 2.0 mechanical engineer Mahali Heffner details how quality assurance activities and factory acceptance testing is carried out on each power station component.

Every one of the hundreds of pump-turbine-generator components undergoes rigorous testing before it leaves the Voith factory. This is to ensure they meet high quality standards and will operate reliably when the power station is switched on.

A team of Snowy Hydro and independent assessors recently conducted mechanical and hydraulic dimensional checks on the first Snowy 2.0 runner at the Voith factory in Shanghai, China.

The runner is the heart of a hydro turbine – it’s the rotating element that drives the generator to produce power.

Acceptance testing includes checking the profile of the blades and surface examinations.

Dye penetrant testing is used to identify imperfections on the surface of the 31 tonne, 4.2 metres-wide runner. We spray on a red dye, clean it and apply the developer. If imperfections are present, the dye will make them visual.

Snowy Hydro and contractor Future Generation Joint Venture (FGJV) work with Voith and other subcontractors on a range of quality assurance activities as part of the multi-stage manufacturing process.

At Lobs Hole in the Snowy Mountains, power station components including turbine guard valves, spiral cases and draft tube liners are being progressively delivered to site.

Meanwhile, deep underground, excavation of the machine hall and transformer hall cavern crowns have been completed and we’ve almost finished the final side slashing to widen the structures. Drill and blast works are also continuing in the cross passages and tunnels that are an important part of the power station complex.

At the other end of the project at Tantangara, the intake is really starting to take shape. We are well into stage two of the excavation, now approximately 49 metres below ground level and approximately six metres to go.

We map the cut face to determine what rock support is required and then after the design is confirmed, rock bolts and shotcrete are installed. It’s exciting to see the shape of the transition from intake to tunnel, with the canopy tube rock support in the intake face forming an arch above the tunnel entrance.

Drill and blast of the tunnel excavation is scheduled to start soon and the first milestone target will be to link up the intake with the gate shaft.

News

SNOWY HYDRO RELEASES 2023 SUSTAINABILITY REPORT, EXPANDS WIND FARM DEAL

11/01/2024

Snowy Hydro has released its 2023 Sustainability Report, underscoring the company’s commitment to environmental responsibility, community support, and the ongoing pursuit of clean, sustainable energy solutions.

The report outlines Snowy Hydro’s Sustainability Program, which aligns with the company’s integral role in Australia’s renewable energy future. It highlights three prioritised sustainability opportunities for 2023-24:

Understanding and mitigating risks associated with climate change
Emissions reduction and facilitating the decarbonisation of the National Electricity Market (NEM)
Strengthening relationships with Traditional Owners and communities where we operate

Snowy Hydro is a major contributor to the reshaping of the NEM to support the transition to a cleaner, low-carbon economy. The company aims to be a driver and enabler of least-cost NEM decarbonisation.

Snowy Hydro CEO Dennis Barnes said reliability, security of supply, and supporting a sustainable transition would remain the central considerations behind how the company operates, develops and maintains its nationally critical infrastructure.

“As Australia undergoes significant changes in its energy markets, Snowy Hydro remains steadfast in its commitment to delivering clean, sustainable, and affordable energy, contributing to a brighter and more sustainable future for all,” Mr Barnes said.

“We are already reducing our low emissions intensity profile by investing in new generation technology and materially increased renewable capacity.

“Investments in the Snowy 2.0 and Hunter Power Projects, the Renewable Energy Procurement Program, and the development of green hydrogen capability directly support that purpose.”

Mr Barnes said energy purchased through Snowy’s wind and solar offtakes continued to grow. The offtakes will deliver approximately 5,200 GWh annually and exceed Snowy Hydro’s expected long-term hydroelectric generation.

The new wind and solar generation Snowy Hydro is enabling will displace more than 33 million tonnes of CO2 per annum. This equates to a 28% reduction in NEM emissions from 2022 levels and approximately 13% of Australia’s total emissions reduction target for 2030.

Mr Barnes today also announced the signing of a further 100 megawatts of renewable capacity from Squadron Energy’s Uungula Wind Farm over 10 years.

“This adds to the 200 megawatts over 15 years that Snowy signed with the project in 2022.

“We are proud to continue supporting important projects like Uungula Wind Farm which will produce enough renewable electricity to power more than 220,000 homes, and will prevent more than 560,000 tonnes of carbon emissions.”

Snowy Hydro has developed and sold products within a new environmentally-focused product class for its commercial and industrial customers, which includes some of Australia’s largest shopping centres, universities, banks and property managers.

The 2023 Sustainability Report outlines our commitment to supporting local communities through employment, education and environmental responsibility.

Snowy Hydro actively fosters diversity and inclusion, aiming to increase female representation in the workforce (currently at 42.5%), particularly at senior levels.

Snowy Hydro has a long history supporting the local communities in which it operates. This includes partnerships and sponsorships with not-for-profit organisations, community grants programs, contributing to local infrastructure, and economic investment in communities. The Snowy Hydro 2023 Sustainability Report is available to download on the Snowy Hydro website.

FAST FACTS

Snowy Hydro releases 2,300 gigalitres of water each year, which generates an average of approximately 4,250 gigawatt hours (or 4.25 terawatt hours) of renewable energy.

Approximately 94% of Snowy Hydro generation comes from renewable sources.

With a generation capacity of 5,500 MW, Snowy Hydro is the third-largest generator by capacity and one of the largest renewable generators in the National Electricity Market.

Snowy Hydro’s hydro operations have the lowest carbon intensity of Australia’s largest generators.

Snowy Hydro is investing in clean, on-demand electricity generation and storage through the expansion of the Snowy Scheme. Snowy 2.0 will add 2,200 MW of generation capacity and 350,000 MWh of storage capacity.

The Hunter Power project will provide 660 MW of dispatchable, on-demand electricity, enabling variable renewable energy sources (wind/solar) to operate in the NEM.

In FY2024, Snowy Hydro anticipates approximately 2.5 terawatt hours of wind and solar energy will be provided through power purchase agreements.

Snowy Hydro employs 1,956 people in Victoria, New South Wales and South Australia, with a further 2,700+ for Snowy 2.0, and 460 on the Hunter Power project.
42.5% of Snowy Hydro employees are female, 57.4% are male and 0.1% are nonbinary or unspecified.

News

BREAKTHROUGH MILESTONE FOR SNOWY 2.0

05/01/2024

Snowy Hydro is pleased to announce another major achievement for the Snowy 2.0 pumped-hydro project, with the breakthrough of the final three metres of the power station’s 223-metre long transformer hall cavern crown.

The Snowy 2.0 delivery team began excavating the transformer hall and machine hall caverns in June 2023. The Snowy 2.0 power station will be located approximately 800m underground at Lobs Hole in the Snowy Mountains. When completed, the machine hall will be 251 metres long and 52 metres high and the transformer hall 223 metres long and 46 metres high. Together they will form one of the largest and deepest caverns in the world, big enough to fit the Sydney Opera House inside.

Precise drill and blast methods are used to profile the curved cavern crowns (or ceilings) and break up the rock, which is mucked out and followed by surface scaling to remove any remaining loose rock. The exposed solid rock face is then supported with rock bolts and shotcrete. The excavation sequence of the cavern crowns is carefully planned and executed, as the rock mass relaxes and moves inwards as the excavated void increases. These movements are expected and are closely monitored during the process.

So far, about 17,000 cubic metres of material has been excavated from the central heading of the transformer hall cavern crown. The heading has been advanced in 3-4 metre rounds from either end of the cavern for a total of 77 blasts.

The machine hall cavern crown breakthrough will take place in coming weeks, and widening of both cavern crowns, known as side slashing, is ongoing and planned for completion in coming months. Excavation of both power station caverns is set to continue through 2024.

The breakthrough of the transformer hall cavern crown represents another important milestone for the Snowy 2.0 pumped-hydro project that will significantly expand the existing Snowy Scheme and will provide an added 2,200 megawatts of on-demand power and 160 hours of large-scale renewable energy storage for the National Electricity Market.

Snowy Hydro CEO Dennis Barnes said: “The breakthrough of the transformer hall cavern crown is a really pleasing milestone for the Snowy 2.0 team, reinforcing that we’re making good progress with our underground drill and blast excavation activities. We are well on our way to delivering the largest single project that will help ensure Australia’s secure and reliable transition to renewable energy.”

News

SNOWY 2.0 PROJECT UPDATE – DECEMBER 2023

19/12/2023

In December’s Snowy 2.0 update, Snowy Hydro CEO Dennis Barnes recaps progress and key events throughout the last 12 months.

The review and reset of the pumped-hydro Snowy Scheme expansion project has been a major milestone in 2023.

The reset has put Snowy 2.0 on a robust and sustainable footing, with new contract arrangements in place and a revised cost of $12 billion. The full commercial operation date for the new 2,200 megawatt power station is December 2028.

The focus for the project is prioritising safety and environmental outcomes while achieving construction program targets.

Meanwhile tunnel boring machine (TBM) Florence is underway again at Tantangara after a significant period paused in soft ground conditions after a surface depression formed above the cutterhead. Following an extensive process of ground stabilisation, the project has recently received NSW government approval for a planning modification, enabling the machine to restart tunnelling the headrace adit.

Progress highlights for 2023 include TBM Lady Eileen Hudson being relaunched in July to excavate her second tunnel for the project – she’s now one kilometre into the tailrace tunnel.

There are more than 2,700 people employed on Snowy 2.0 and a total of 20 million hours have been worked to date.

Drill and blast excavation of the power station cavern crowns is well underway from both ends of the machine and transformer halls and we’re seeing large power station components manufactured by Voith Hydro delivered to site.

Senior electrical quality engineer Victor Teo is in Shanghai, China, where Voith is fabricating some of the key electrical components for Snowy 2.0, including stator bars, rotor bars and poles.

The stator bars are bent to a precise shape and highly specialised insulation tape is applied by both machine and technician. These bars are part of the generator which is connected to the transformer to deliver electrical current.

Insulation resistance and short circuit tests are conducted on every bar to ensure compliance with our engineering requirements and Australian Standards.

468 stator bars are needed for each of the six pump-turbine generator units, so over 3,000 of them including spares will be produced.

There is always a member from the Snowy Hydro team in China to conduct quality assurance activities, monitor progress, act as a conduit to close out technical issues and to conduct Factory Acceptance Tests

Snowy 2.0 project manager and environmental engineer Emily Martin is at Tantangara, where TBM Florence is tunnelling in slurry, or closed, mode. This mode utilises the onsite slurry treatment plant and allows the team to pressurise the ground around the TBM to provide additional stability.

The intake excavation works at Tantangara are progressing well, with stage 2 well underway.

This involves another 78,000 cubic metres of drilling and blasting earthworks, along with rockbolt installation and shotcreting.

The intake excavation, which is where water will enter the headrace tunnel, is currently about 35 metres deep and it will be extended to a total depth of 55 metres.

News

SNOWY 2.0 PROJECT UPDATE – NOVEMBER 2023

05/12/2023

Snowy 2.0 is entering an exciting phase as we build the largest single project that will help ensure Australia’s secure and reliable transition to renewable energy.

In this month’s project update Hamish Pryor, construction director for Snowy 2.0, provides an overview of the power station equipment manufacturing that is in full swing.

The bespoke Snowy 2.0 power station components are being fabricated with precision and skill at one of Voith Hydro’s global production facilities in Shanghai, China.

Voith Hydro is partnering with Snowy 2.0 to make the six pumped hydro units that will generate up to 2,200 megawatts of power for Australia’s electricity grid.

Voith has more than 150 years of experience in hydropower systems and its highly skilled team is developing efficient and reliable equipment that will support the 150-year design life of Snowy 2.0.

At the Shanghai factory, every item that is manufactured for the project undergoes comprehensive quality checks and testing before being shipped to Australia.

Voith’s quality, research and development team in Germany works directly with its Shanghai engineering experts on design, manufacturing processes and quality control. The team also collaborates closely with the Snowy 2.0 project team in Australia.

Among the large components being manufactured are the 13 metre-wide spiral cases and the main inlet valves – each weighing 140 tonnes and 2.2 metres in diameter – and the 31-tonne runners.

The runner is the heart of a hydro power turbine – it’s the rotating element that drives the generator to produce electrical energy. Exceptional machining and highly specialised welding skills are used to fabricate the components.

In Voith’s state-of-the-art electrical workshop more than 2,700 stator bars – which will be connected to the transformers to deliver power produced in the generators – are being manufactured.

Snowy Hydro has team members based in Shanghai to conduct quality assurance activities and monitor progress, while specialist mechanical and electrical engineers attend factory acceptance testing.

Recently, the final acceptance test for the first unit runner was completed and celebrated with a photo in the workshop.

In the Snowy Mountains in NSW, the Snowy 2.0 delivery team is also creating water intakes at the Talbingo and Tantangara reservoirs. A 28-metre diameter, 250 metre-deep surge shaft is being built at Marica and will become one of the largest operating shafts in the world.

Tunnel boring machines excavating the Snowy 2.0 tunnels are lining them with locally-made concrete segments – we’ve manufactured almost 90,000 of them at the Cooma precast factory so far. And the underground power station cavern complex is underway, with drill and blast excavation.

News

SNOWY 2.0 PROJECT UPDATE – OCTOBER 2023

08/11/2023

In this month’s project update, we check on tunnel excavation at Talbingo, progress at the upstream surge shaft at Marica, and we hear about the specialised drilling underway to prepare for services such as power and communications between Lobs Hole, Marica and Tantangara.

Will Binsted, Snowy 2.0 Lobs Hole Construction Manager, has been working on the project for four years and is responsible for coordinating both surface and underground works. Will, who lives locally in Tumut, liaises with technical specialists as well as designers and project engineers across the busy worksite.

To see the latest Snowy 2.0 project’s statistics, view the fact sheet here.

A complex task is underway at Lobs Hole to drill boreholes for the pipes that will house power, water and fibre optic cable for communications across three of the Snowy 2.0 sites.

Horizontal directional drilling (HDD) is being used to drill 2.2km-long boreholes from Lobs Hole to Marica. The holes are initially 300 millimetres in diameter and have an elevation difference of 650 metres.

Two drilling operations are underway from top and bottom and will join up to create a continuous borehole before being enlarged to 660 millimetres in diameter.

This type of drilling is used for service lines that cross under waterways or underground structures and requires a high level of skill to maintain directional control while operating a drill string up to 1.8km long. Snowy 2.0 has contracted HDD experts Michels for the project.

The boreholes eliminate the need to construct approximately five kilometres of roads and excavate up to 60 metre cuts in the steep terrain, helping the Snowy 2.0 project team minimise environmental impacts.

HDD techniques will also be used to take services under the Snowy Mountains Highway and waterways across the plateau through to the Tantangara worksite.

At Marica, the 28 metre diameter headrace surge shaft is now one-fifth of the way to its final depth of 263 metres and we’re starting drill and blast activities. There are two hoisting buckets called kibbles with a capacity of 25 tonnes for loading out excavated rock.

Excavators break up the rock with hydraulic hammers before it’s loaded into the kibbles and craned out of the shaft. The kibbles are lowered into hoppers and the rock drops into an articulated dump truck before being removed to a temporary stockpile area.

With the shaft now more than 50 metres deep, an integrated work platform and personnel hoist is being installed to provide worker access. We’ve installed ventilation ducts to manage air quality.

At Talbingo, tunnelling of the tailrace adit is complete. TBM Lady Eileen Hudson is now excavating the tailrace tunnel alignment and heading towards the power station complex. This marks the start of the first power waterway on the Snowy 2.0 project.

Excavation is ahead of schedule, with more than 26 metres recently excavated in a single day. The tailrace tunnel is six kilometres in length, with TBM excavation continuing through to mid-2025.