11.7 GW+
Connections managed
by our team
by our team
7.4 GW+
Constructed &
commissioned
commissioned
100+
HV substations
delivered
delivered
5,000 km+
Powerlines
constructed
constructed
1,300+
In-house team
nationally
nationally
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+Connections managed by our team
- 7.4 GW+Constructed & commissioned
- 100+HV substations delivered
- 5,000 km+Powerlines constructed
- 1,300+In-house team nationally
— The Network Challenge
Delivery capability will decide which projects connect.
Two historic transformations are running in parallel. Australia is decarbonising and decentralising its grid, and the AI race for power is rewriting demand on it. Both depend on the same critical interface: 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. Correspondingly these capabilities are also the most scarce. Capability, capacity and certainty at the connection will determine which projects get built.
— Why Symphony
Capability and capacity to deliver, structure and scale to succeed.
Symphony has been purpose built as a partner to developers to accelerate the connection of Australia's renewable and digital future.
Built differently, by design. Independent, integrated, scalable and aligned to our partners' success over decades of asset operations.
— 01
Independent
No regulated business to operate, no split focus. Symphony exists to serve clients connection infrastructure needs. That's our entire business.
— 02
Integrated
1,300+ specialists in-house. Electrical, 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
For Symphony connection assets are a lifetime performance obligation, not just a delivery milestone. Our success is tied to yours, at handover and for the decades of operation that follow under market leading performance guarantees.
— OUR END-TO-END OFFERING
One accountable partner.
Eight 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
Operations & Maintenance
Reactive and planned maintenance and day-to-day operations of connection assets — keeping the connection available, compliant and performing from energisation onward.
— 08
Ownership & Lifecycle Asset Management
Whole-of-life asset management — lifecycle planning, regulatory compliance and risk management, 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 partners in your project lifecycle depends on what your project needs.
— 01
Development Partnership
Phases 01–08
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 in the project's network assets 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 04–08
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 04–08
Hybrid commercial model, one partnership. Works delivered under a standard EPC contract; operations and maintenance under a services agreement or partnership. We acquire ownership 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.
+ Companies and teams 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.
