200A Underhead Supply Upgrades
Is an Underground Supply Right for Your Sydney Site?
Underground 200A supply is required or strongly preferred across a range of scenarios — from new builds to prestige residential rebuilds replacing aerial service.
Contact US- New residential and commercial developments requiring underground supply by council or DA condition
- Strata, duplex, triplex and multi-dwelling developments
- Home renovations adding EV chargers, ducted air-con, pool pumps or solar batteries pushing demand above existing capacity
- Properties converting overhead to underground service mains
- Prestige residential properties wanting an aerial-free, clean facade
- Properties upgrading from single phase to three phase with an underground service
- Properties upgrading from single phase to three phase with an underground serviceSites where overhead supply isn’t feasible due to clearance, access or tree-cover issues
- Commercial and industrial sites with existing pit-and-pipe underground infrastructure
What Is a 200A Underground Supply?
A 200A underground supply runs service mains from the network pit (in the street or footpath) through underground conduit to your switchboard or private pillar. The cable, conduit and trench are sized and installed to NSW Service & Installation Rules and AS/NZS 3000 — typically orange heavy-duty conduit at 500–600mm depth with detectable warning tape above.
Underground service eliminates aerial cabling on your building exterior and is significantly more resilient to storms, branch fall and accidental impact than overhead supply. Underground installations involve civil works — trench excavation, conduit installation, pit connection and surface reinstatement — and require coordination with your local council, the network distributor (Ausgrid, Endeavour Energy or Essential Energy), and on some sites Sydney Water and other service providers. We manage all of it under one fixed-price quote.
200A is the right capacity for most modern Sydney homes adding EV chargers, ducted air-conditioning, induction cooking, pool equipment, solar and battery systems. Below 200A, sites often face phase upgrade requirements or consumer mains bottlenecks within five years of installation.Overhead service mains run from the network street pole (or a private pole on your property) via aerial cable to the Point of Attachment on your building. This is the most common connection method across Sydney, Ausgrid, Endeavour Energy, and Essential Energy network areas.
What’s Included in a 200A Underground System
A complete 200A underground supply upgrade includes every item below — supplied, installed and certified by our Level 2 ASP team.
- Underground conduit and pit installation: Trench excavation, orange heavy-duty conduit laid to distributor specification, marker tape and reinstatement (turf, pavers or concrete)
- 200A underground service mains: Correctly rated XLPE cable pulled through conduit from the network connection point
- Network pit connection: Terminated and made off to Ausgrid, Endeavour Energy or Essential Energy standard
- Private pillar or pit supplied and installed where required at the property boundary
- 200A earthing system: Eart200A consumer mains — from the supply point to your main switchboard, sized to AS/NZS 3008h stake, water pipe bonding, MEN link
- 200A earthing system: Earth stake, water-pipe bonding and MEN link
- 200A main switchboard: Correctly rated main switch, metering compartment and protection devices
- Smart meter upgrade: Coordinated with your network and energy retailer
- NOSW lodgement and CCEW issued on completion: Full compliance documentation handed over
Our Energy Providers
Authorised by Sydney's major networks
Accredited with All Three NSW Distributors
Whether your Sydney site is served by Ausgrid, Endeavour Energy or Essential Energy, we’re accredited and experienced with all three networks — including their underground supply specifications and pit-connection standards.
Ausgrid · Endeavour Energy · Essential Energy
Level 2 ASP accredited across every NSW distribution area, including underground connection types
Maximum Demand Calculation
Prepared in-house to AS/NZS 3000 to confirm 200A is correct for your site
Network Application
Submitted on your behalf — with full technical and civil-works specification
Capacity Assessment
Network capacity check coordinated directly with the distributor
Civil Works Specification
Trenching, conduit, pits and reinstatement managed to distributor standard
NOSW & CCEW
Notification of Service Work and Certificate of Compliance Electrical Work issued on completion
The 200A Underground Supply Upgrade Process
From maximum demand calculation through to energisation — here’s exactly how High Demand Electrical manages a 200A underground upgrade end to end.
- Maximum Demand Calculation
We prepare a maximum demand calculation for your site to AS/NZS 3000. This confirms 200A is the correct solution and forms the technical basis of your network application. - Network Application
We prepare and submit your supply upgrade application to your NSW distributor — including site details, maximum demand calculation, proposed underground configuration and civil-works specification. - Network Assessment
The distributor assesses available network capacity and reviews the proposed underground connection design. Most 200A applications proceed without requiring upstream construction. - Level 1 / Level 3 Coordination (If Required)
Where additional network capacity is needed, we coordinate Level 3 network design and Level 1 ASP construction through our managed supply chain — you still deal with one company. - Level 2 Installation
Our Level 2 ASP team completes the full underground installation — civil works, conduit, cable, pit connections, consumer mains, earthing, switchboard and metering. NOSW lodged on completion. - Energisation
Your new 200A underground supply is energised, tested and commissioned. CCEW and all compliance documentation are issued to you.
Why Choose High Demand Electrical?
Experience, accreditation and a fixed-price approach that removes uncertainty from complex Level 2 underground projects.
Complementary Level 2 ASP Services
200A Overhead Supply Upgrades
Underground Service Mains Installation
Switchboard Upgrades
Single to Three Phase Upgrades
Smart Meter Upgrades
Private Pillar and Pole Installation
Get Your 200A Underground Upgrade Quote Today
High Demand Electrical - 200A Underground Upgrades
FAQs
Answers to the questions we hear most from Sydney homeowners, builders, and site managers.
An underground 200A upgrade involves excavating a trench from the network pit to your building, installing orange heavy-duty conduit (typically 500–600mm deep per AS/NZS 3000 and NSW Service & Installation Rules), pulling correctly rated service mains, connecting at the network pit, terminating at a 200A-rated switchboard, and energising through your distributor.
Costs vary by trench length, site access, surface reinstatement and whether a private pillar is required. Standard residential ranges $3,500–$7,000+; long runs, directional boring or restricted access push $7,000–$12,000+. We provide fixed-price quotes after a site assessment.
Underground is cleaner, more weather-resistant and more reliable — and is increasingly required by councils for new developments. Overhead is cheaper but exposes cabling to storms, tree damage and clearance issues. See our 200A overhead supply page for the alternative.
In some cases, trenching in council footpath or road verge requires a road opening permit. We manage this as part of the project — including all coordination with your local Sydney council.
Civil works typically take 1–2 days. Electrical installation follows once civil works are complete. End-to-end project timing depends on network approval, which is usually several weeks.
Testimonials
"Chris was the professional, punctual and his services are exceptional. Chris re-wired the entire property, chased the electrical work in the bathroom and kitchen areas, left a clean and tidy environment and his open communication and dialogue was a welcomed experience.
When he quoted an arrival time, he was there. He talked me through what he was doing, and provided feedback/suggestions on how to tackle any issues. I felt part of the process, as opposed to being another Customer.
A pleasure to deal with, and I recommend his services. I'll be definitely calling him again with any electrical work I need done."
"Chris and his team are a professional outfit who were friendly and very helpful with any questions I had about the work they were doing. They completed their work promptly and to a high standard of quality. Would definitely use them again for any future electrical works!"
"HDE did a great job at our place, Chris was highly responsive, professional and a master of his craft; there was no challenge too great. I would highly recommend High Demand Electrical."
"Chris and his team did a great job. Excellent customer service all round. Great communication, very thorough and professional. Took the time to get the job done right and cleaned up afterwards Would hire again and definitely recommend. A+ job."
"Great electricians- very professional and efficient with doing the electricals for our kitchen renovations & new lighting in our apartment. Gave good suggestions as well for kitchen cupboard lighting. Highly recommend them."
Our Partners
Powering Your Needs with Expertise
If you’re looking for a reliable, experienced, and prompt electrician, look no further than High Demand Electrical. We cater to all your electrical needs, from routine maintenance to emergency repairs and complete system installations. Our skilled team is committed to providing professional service that ensures your electrical systems run smoothly. Whether it's a small task or a large project, give us a call today. Let us meet all your electrical demands with the quality and reliability you deserve.
