Electrical
Power Factor Correction and Your Energy Bill
If your business runs motors, pumps, compressors or air conditioning, your power factor is quietly shaping your energy bill. Getting it right can reduce demand charges and free up capacity you already pay for.
What Power Factor Actually Is
Power factor is the ratio between the real power your equipment uses to do work and the total power your site draws from the grid. When the two line up, your power factor is close to one, which is ideal.
Inductive loads such as motors, transformers and fluorescent lighting draw extra current that doesn't do useful work but still has to travel through your cabling and the network. That gap between useful power and total power is where a poor power factor comes from.
- Real power: the energy that runs your machines and lights
- Reactive power: the extra current inductive equipment needs to operate
- Apparent power: the total the grid has to supply, which is what your network cares about
Why It Hits Commercial Bills Harder
Most residential customers never see power factor on a bill. Commercial and industrial sites are different because their tariffs often include a demand charge based on the total power drawn, not just the energy consumed.
A low power factor means the network delivers more apparent power for the same amount of useful work. That can push up your demand charges and, in some cases, attract penalties from your network provider. The exact impact depends on your tariff, your load profile and your distributor's rules.
How Power Factor Correction Works
Correction usually involves installing capacitor banks, or in some cases active correction equipment, that supply reactive power locally at your switchboard. That means your site draws less of it from the grid.
Because the reactive current is supplied on site rather than travelling through the network, the total power your meter records can drop even though your machines do exactly the same amount of work. Well-designed systems can adjust automatically as your loads change through the day.
- Fixed capacitor banks for steady, predictable loads
- Automatic banks that switch stages in and out as demand varies
- Active correction for sites with rapidly changing or harmonic-heavy loads
Signs Your Site Might Benefit
You won't know your power factor for certain without a proper assessment, but a few things point to it being worth a look. Heavy motor loads, older equipment and a demand-based tariff are common indicators.
It's also worth checking if your switchboard feels close to capacity but your actual energy use doesn't seem to match. Correcting power factor can free up headroom you're effectively paying for but not using.
- Multiple large motors, pumps or compressors running through the day
- A network tariff with a demand or capacity charge
- Reactive power or power factor line items on your bill
- A switchboard nearing its limit as the business grows
How It Fits With Solar and Battery
Power factor correction sits neatly alongside a broader energy strategy. Reducing demand charges through correction, generating your own power with commercial solar, and shifting when you draw from the grid with battery storage all work together to lower what you pay.
Our AI-driven energy arbitrage takes this further, charging a battery when power is cheap and discharging or exporting when it's dear. Getting the electrical fundamentals like power factor right first means the rest of the system performs cleanly on top of it.
Where a Site Review Comes In
Every site is different. Your load profile, tariff and network determine whether correction makes sense and what form it should take, which is why real figures only come from measuring your site rather than a rule of thumb.
ATI is CEC and SAA accredited and works Australia-wide with our own in-house team, no subcontractors, on projects from 6.6kW right up to MW scale. If you'd like to know what your power factor is doing to your bill, a site review is the practical place to start.
Poor power factor makes your site draw more current than it needs, and on a commercial tariff that often shows up as higher demand charges.
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