11.7 GW+
Grid connections
managed by our team
managed by our team
7.4 GW+
Constructed and commissioned
1,300+
In-house team
nationally
nationally
100+
HV
substations delivered
substations delivered
Grid connection.
Delivered with certainty.
We develop, deliver and operate the high-voltage assets that connect energy generation, energy storage and data centre projects to the grid.
- 11.7 GW+Grid connections managed by our team
- 7.4 GW+Constructed and commissioned
- 1,300+In-house team nationally
- 100+HV substations delivered
— The Network Challenge
Delivery capability will decide which projects connect.
Two historic transformations are running in parallel. Australia is decarbonising its grid, and the AI race is rewriting demand on it. Both depend on the same thing: connection to the grid.
Substations, switchyards, transmission lines and electrical balance of plant make up the most complex and most critical component of any project. They are also the most underserved. Capability, capacity and certainty at the connection point now decide which projects get built.
— Why Symphony
Capability to deliver, structure to scale and succeed.
Symphony is a purpose-built partner to accelerate the connection of Australia's renewable and digital future.
Built differently. By design. Independent, integrated, scalable and aligned.
We're on your side from day one through decades of operation.
— 01
Independent
No regulated business to protect. No divided loyalties. Symphony exists to serve connection infrastructure clients. That's the entire business.
— 02
Integrated
1,300+ specialists in-house. Engineering, manufacturing, construction, civil and operations under one roof. We don't subcontract the things you're holding us accountable for.
— 03
Scalable
Engineered as a product, not a project. Standardised, manufactured in-house, and deployed at the speed the energy transition now demands.
— 04
Aligned
Connection as a lifetime performance obligation, not just a delivery milestone. Nothing paid until we deliver. Then you're protected for life by a market-leading availability performance guarantee. Our success is tied to yours, at handover and for the thirty years of operation that follow.
— OUR END-TO-END OFFERING
One accountable partner.
Seven complex project phases.
Symphony's integrated model spans the entire connection lifecycle. Unlike traditional fragmented delivery approaches and current market offerings, our in-house workforce covers every phase with a single point of accountability.
— 01
Concept & Grid Strategy
Identify optimal sites with grid capacity, lowest connection cost and fastest energisation timeline. We model connection scenarios before you commit to a site.
— 02
Early Planning & Design
Concept-level technical designs, load forecasts and project schedule development to support development approvals and business case preparation.
— 03
Grid Modelling & Connection Application
Power systems studies, grid impact modelling and preparation of the formal connection application to secure TNSP approval.
— 04
Engineering & Design
Detailed engineering design for all HV connection assets including switchyards, substations, protection systems and control infrastructure.
— 05
Construction
Fully in-house HV construction workforce delivering switchyards, substations, OHL and cable works to the highest safety and quality standards.
— 06
Testing & Commissioning
Factory and site acceptance testing, protection system verification, and coordinated TNSP commissioning. Compliant energisation, seamless transition to operations.
— 07
Ownership, Operation & Maintenance
Long-term ownership, operations and maintenance of connection assets, including develop-own-operate models for clients seeking off-balance-sheet solutions.
— OUR PARTNERSHIP MODEL
Three partnership models. Structured for certainty, flexible by design.
We partner with developers at any stage of their project lifecycle. Where Symphony enters depends on what your project needs.
— 01
Development Partnership
Phases 01–07
Full lifecycle from site selection and grid connection strategy to energisation and long-term operation. We deploy capital, engineering, and delivery expertise as a co-invested partner from day one.
- De-risk path to FID
- Fastest path. No rework, no procurement drag
- Fast-tracked delivery through aligned incentives
- Execution certainty on time and cost
- Lifecycle risk management
— 02
Delivery Partnership
Phases 04–07
Integrated delivery from detailed design through construction, testing, commissioning, and into operations, maintenance and lifecycle asset management. A single point of accountability for the critical path to grid connection.
- De-risk path to FID
- Fastest path. No rework, no procurement drag
- Fast-tracked delivery through aligned incentives
- Execution certainty on time and cost
- Lifecycle risk management
— 03
EPC + Operations Partnership
Phases 04–07
Two commercial modes, one partnership. Phases 04–06 delivered under a standard EPC contract; Phase 07 operated under an annuity fee. We acquire the connection when capital recycling suits.
- De-risk path to FID
- Fastest path. No rework, no procurement drag
- Fast-tracked delivery through aligned incentives
- Execution certainty on time and cost
- Lifecycle risk management
Plus discrete services across any phase. Outside the three partnership models, Symphony's in-house workforce delivers individual services including concept and grid strategy support, grid connection application leadership, TNSP stakeholder management, EPC services and complete maintenance solutions.
Talk to us →— Our in-house Capability
Delivery capability and network connection leadership at national scale.
Symphony delivers through an integrated platform of 100% owned specialist businesses and national workforce of 1,300+.
Together they bring decades of delivery across high-voltage substations, powerlines, civil works, and specialist engineering.
The Symphony team leading connection partnerships has guided more of Australia's renewable build than any other team in market. Now on your side of the project.
+ Legacy companies and capability now an integrated part of Symphony
— Institutional Pedigree
Supported to deliver at scale.
Symphony is backed by Blackstone. Blackstone is the world's #1 alternative asset manager, with more than $1.3 trillion USD in AUM.
Blackstone is a globally leading investor at the intersection of the energy transition and AI infrastructure.
