Sydney, NSW – June 13, 2026 – Australia’s largest transmission project, Project EnergyConnect, has reached a critical milestone this week with the completion and energisation of its final 540-kilometre New South Wales section. The significant infrastructure, managed by Transgrid, aims to bolster electricity transfer between NSW, Victoria, and South Australia, promising to integrate more low-cost renewable energy into the National Electricity Market (NEM) and offering long-term benefits to consumers, despite a substantial cost blowout to AUD$3.8 billion for Transgrid’s portion.
The 700-kilometre NSW section of the interconnector, stretching from Buronga to Wagga Wagga, is now undergoing detailed commissioning checks, with the Australian Energy Market Operator (AEMO) slated to commence inter-network testing later in 2026. This testing is crucial to verify the reliability and performance of the new infrastructure before it becomes fully operational.
Project EnergyConnect is a 900-kilometre interconnector, with its first stage linking the South Australian border, Buronga, and Victoria having become operational in 2025. The completion of the NSW segment, featuring over 1,500 towers and 10,000 kilometres of high-voltage conductor cabling, marks a pivotal step in Australia’s energy transition.
Strengthening the NEM for a Renewable Future
The core purpose of Project EnergyConnect is to facilitate the connection of new renewable energy generation, particularly from the Riverina and South West NSW Renewable Energy Zones (REZs), into the NEM. This enhanced connectivity is vital as Australia moves to progressively retire its ageing coal-fired power stations. Transgrid Group CEO Brett Redman emphasised the project’s role in building the modern power system required by 2035.
“NSW is well advanced in the deep transition, and Transgrid has been getting on with the job of delivering more than 2,000km of critical transmission lines that will provide millions of consumers with access to lower-cost renewable energy.”
The interconnector is designed to increase transfer capacity and improve grid reliability, which is essential for managing the intermittency of solar and wind power. By enabling the flow of cheaper, cleaner energy across states, it is anticipated to put downward pressure on wholesale electricity prices, a major component of household energy bills.
Significant Investment and Cost Challenges
While the long-term benefits are substantial, the project has not been without its challenges. Transgrid’s share of Project EnergyConnect has seen its estimated cost escalate from an initial AUD$2.1 billion to approximately AUD$3.8 billion. This AUD$1.7 billion increase has been attributed to a confluence of factors, including global supply chain disruptions, labour shortages, record inflation, adverse weather events like flooding, and the insolvency of a delivery partner.
These cost overruns have prompted scrutiny, with Transgrid previously petitioning the Australian Energy Regulator (AER) to recover an additional AUD$1.1 billion of AUD$1.5 billion from consumers for its projects, including EnergyConnect and HumeLink. Despite these increases, Transgrid CEO Brett Redman maintains that the net market benefits for consumers are still projected to be significant, estimated at AUD$964 million.
For the average NSW household, this could translate to annual power bill savings of up to AUD$51, and around AUD$110 for an average small business, according to Transgrid’s modelling for a related project, Sydney Ring South, which integrates with EnergyConnect. This indicates that while the upfront investment is considerable, the long-term operational efficiencies and access to cheaper renewable generation are expected to offset these costs.
The Road Ahead for EnergyConnect
The completion of construction is a major hurdle cleared, but the journey to full operational status continues. AEMO’s upcoming inter-network testing will be a critical phase, ensuring the system integrates seamlessly and performs as designed under various conditions. This will confirm its ability to handle increased power flows and contribute to overall grid stability.
This project is part of a broader suite of transmission upgrades across NSW, including the ongoing HumeLink project, which will connect the Snowy 2.0 pumped hydro scheme, and the planning for the NSW section of the Victoria–New South Wales Interconnector West (VNI West).
As Australia navigates its complex energy transition, investments in critical transmission infrastructure like Project EnergyConnect are indispensable. They are the backbone that allows the country to harness its abundant renewable resources, improve grid resilience, and ultimately deliver more affordable and reliable electricity to homes and businesses. For homeowners looking to manage their energy consumption, understanding these broader grid developments complements strategies like adopting Smart Home Energy Systems: Slash Your 2026 Australian Electricity Bills by Up To 30% or exploring Unlock $3,700+ in Rebates: Your 2026 Guide to Australian Home Battery Systems to maximise personal savings and grid support.
Comparative Project Costs and Benefits
To put Project EnergyConnect’s scale and costs into perspective, here’s a brief comparison with other major transmission projects in Australia:
| Project Name | Initial Estimated Cost (AUD) | Latest Estimated Cost (AUD) | Primary Purpose | Status |
|---|---|---|---|---|
| Project EnergyConnect (Transgrid NSW share) | $2.1 billion | $3.8 billion | Interconnect NSW, VIC, SA; integrate SW NSW REZ | NSW section construction complete, energised; AEMO testing later 2026 |
| CopperString (Queensland) | $1.8 billion (original) | $3.2 billion | Connect North West Minerals Province to NEM; integrate renewables | Queensland government committed $3.2B; construction commenced at Flinders Substation |
| HumeLink (NSW) | $3.3 billion | $4.9 billion | Connect Snowy 2.0 to NEM | Under construction |
| VNI West (NSW section) | $3.7 billion (NSW only) | Up to $11.4 billion (total) | Connect NSW and Victoria REZs | Planning progressing |
The completion of Project EnergyConnect’s NSW section is a tangible step forward, demonstrating real progress in building the infrastructure needed to underpin Australia’s transition to a high-renewable energy future. While cost pressures remain a concern across the industry, the long-term economic and environmental benefits are expected to be substantial for Australian consumers.