Commercial Power Supply Upgrades Sydney

More capacity for growing businesses — 200A, 400A, three-phase and switchboard upgrades, designed and installed with minimal disruption to trade.

‍If your business is adding EV chargers, upgrading air conditioning, fitting out new equipment or simply outgrowing a supply sized for a much smaller operation, High Demand Electrical scopes and delivers the whole upgrade — load assessment, distributor application, switchboard and supply works, and the compliance sign-off — as one managed project, with outages scheduled around your trading hours wherever possible.

Strata Main Switchboard and Consumer Mains

AS/NZS 3000 & Distributor Compliance for Commercial Supply

Commercial power supply work is governed by AS/NZS 3000, and where the upgrade touches the network connection point, the Service and Installation Rules of NSW (SIRNSW) set out how that side of the work is carried out and approved. Getting this wrong is one of the more common causes of a distributor defect notice, which then has to be rectified before the upgrade can be connected.

HDE builds distributor timeframes into the project plan from the start, and if you're not sure which network area your property sits in before applying, check it in seconds with our postcode checker.

High Demand Electrical service truck at a residential job site

Quick Answer

When Does a Business Need a Power Supply Upgrade? Breakers tripping, new equipment quotes, EV chargers, or a fit-out that's outgrown the original supply. If your switchboard trips under normal load, a quote for new equipment or EV charging infrastructure comes back requiring more capacity than you have, or the property was fitted out years ago for a fraction of today's electrical load, it's time for a load assessment. That assessment tells you exactly what size upgrade the business actually needs, rather than guessing.

Strata Main Switchboard and Consumer Mains

Why Sydney Businesses Upgrade Their Power Supply

Commercial premises are rarely wired for their eventual load on day one — growth, new equipment and changing regulations all push demand past the original design.

Growing equipment load

New machinery, kitchen equipment or IT infrastructure adding demand the original supply wasn't sized for.

EV fleet charging

Fitting a depot or carpark with EV chargers is one of the fastest ways to outgrow an existing supply.

HVAC & mechanical upgrades

Larger air conditioning plant or ducted systems very often need three-phase power the site doesn't yet have.

Fit-outs & expansion

A new tenancy fit-out, extra floor space or a change of use usually means a fresh load assessment against current demand.

A supply upgrade is also frequently the fix behind a distributor defect notice or a failed commercial electrical compliance check — capacity issues tend to surface as compliance issues before anyone looks at the switchboard directly.

Strata Main Switchboard and Consumer Mains

How High Demand Electrical Delivers a Commercial Upgrade

Load Assessment & Audit

We audit current and planned load — equipment, HVAC, EV charging, future expansion — and size the right supply capacity and phase configuration for the business, not just the building.

Distributor Application & Design

We lodge the connection application with Ausgrid, Endeavour Energy or Essential Energy, whichever services the site, and design the switchboard and supply works around their approval.

Switchboard & Supply Works

Switchboard upgrade, new mains and any three-phase conversion carried out on a scheduled outage window, coordinated around trading hours wherever possible.

‍Testing & Certification

Full testing of the upgraded supply and switchboard, with a Certificate of Compliance issued so the business has a clean compliance record on file.

Strata Main Switchboard and Consumer Mains

Which Upgrade Path Fits Your Business

Lightest Scope

Switchboard Upgrade

Existing supply capacity is adequate; the board itself needs modernising for safety or metering.

New board, RCDs & protection
No distributor application needed
Fastest to schedule

Most Common

200A Supply Upgrade

Extra capacity for EV chargers, split systems or a moderate fit-out expansion.

Overhead or underground
Suits most retail & office sites
Distributor approval required

Largest Scope

400A & Three-Phase Upgrade

Larger commercial and light-industrial sites with heavier plant, multiple three-phase circuits or major expansion planned.

400A underground supply
Industrial three-phase options
Longest distributor lead time

Fully Licensed

Our Energy Providers

Authorised by Sydney's major networks

Related Services

Related Power Infrastructure Services

Strata & Real Estate Electricians

Our broader strata electrical service for owners corporations and managers.

Switchboard Upgrades

The switchboard side of this work, in detail.

Consumer Mains Installation

New or replacement consumer mains from the meter to the switchboard.

Commercial Electrical Compliance

Certification and audit-ready documentation for the OC's records.

Electrical Safety Inspection

A building-wide health check ahead of budgeting for larger works.

Defect Notice Rectification

Clearing an issued defect notice on common property electrical.

Strata Main Switchboard and Consumer Mains

What’s Included in a Commercial Power Supply Upgrade

Load Assessment & Audit

Current and projected demand mapped against your existing supply before anything is quoted.

Distributor Application

Lodged and managed with Ausgrid, Endeavour Energy or Essential Energy on your behalf.

Switchboard Upgrade

New board, protection and metering sized to the upgraded capacity.

Supply Capacity Upgrade

200A or 400A supply, overhead or underground depending on the site.

Three-Phase Conversion

Where HVAC, machinery or EV charging requires it.

Testing & Compliance

Full testing and a Certificate of Compliance for Electrical Work on completion.

Scheduled Outage Planning

Work timed around trading hours, with the switch-over window agreed upfront.

Strata Main Switchboard and Consumer Mains

Why High Demand Electrical

High Demand Electrical is a Level 2 ASP accredited electrical contractor (EC Licence 397193C), certified to the ISO 9001, ISO 45001 and ISO 14001 standards. We run the load assessment, lodge the distributor application, deliver the switchboard and supply works, and hand over the compliance certificate — so a commercial power supply upgrade is one quoted, managed project rather than three separate trades and three separate quotes.

We service businesses across Sydney, and every upgrade starts with a proper load assessment rather than a price over the phone, since current demand, projected growth and the site's network area all change the right-sized scope.

Frequently Asked Questions

FAQs

How do I know if my business needs a power supply upgrade?

The usual signs are tripping breakers or a switchboard running hot under normal load, quotes for new equipment, EV chargers or air conditioning that come back requiring more capacity than you have, or the property was fitted out years ago for a much smaller electrical load than it now carries. A load assessment gives you a definite answer either way.

What's the difference between a 200A and 400A commercial supply upgrade?

200A is the common upgrade path for most retail, office and light-commercial premises adding modest extra load such as split systems or EV chargers. 400A suits larger commercial and light-industrial sites running heavier equipment, multiple three-phase circuits, or planning significant future expansion. Your load assessment determines which one your business actually needs.

Do I need three-phase power for my business?

Single-phase is usually enough for standard office or retail loads. Three-phase is generally required for larger air conditioning plant, industrial machinery, EV fleet charging, commercial kitchen equipment or workshop tools that specify a three-phase supply. We confirm this as part of the load assessment rather than guessing from the equipment list alone.

How long does a commercial power supply upgrade take, and will it shut down my business?

A switchboard-only upgrade is often completed in a single scheduled outage window, frequently after hours or on a weekend. A full supply upgrade that involves the distributor's network connection depends on their approval and connection scheduling, which we manage and communicate throughout so you can plan around it rather than being caught out.

Who approves a commercial power supply upgrade in Sydney?

Your network distributor — Ausgrid, Endeavour Energy or Essential Energy depending on the property's location — approves any change to the network connection point or supply capacity. HDE lodges and manages that application as part of the job, alongside the Level 2 ASP and Level 1 accredited work the upgrade itself requires.

Ready To Upgrade Your Commercial Power Supply?

Every upgrade starts with a proper load assessment before we confirm scope or pricing — current and projected demand change the job more than anything else.

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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.

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