N39 — Sub-transmission Seasonal TOU Demand

Endeavour Energy · Default · Sub-transmission · 2026–27

Western Sydney, the Blue Mountains, Southern Highlands and the Illawarra.

N39 Sub-transmission Seasonal TOU Demand tariff guide

Who it’s for

Large connections supplied at Endeavour Energy sub-transmission voltage.

What you pay

You pay fixed and energy charges. The bill also uses the highest kVA reading in set periods.

If you get solar

Solar can reduce daytime grid use. If the highest kVA reading occurs after solar output falls, solar alone will not remove it. Solar does not correct poor power factor.

If you get a battery

A battery can reduce the active-power part of the kVA peak. Check power factor before you size it.

Check before you decide

  • Confirm this code on a current retailer bill.
  • Use 12 months of interval data. Check the time of each billed peak.
  • Get kW, kVA and power-factor data from the billing meter.
  • Get an engineering review before you select equipment.
2026–27 network prices

What it costs, and when

These are the network’s charges only. Your retailer adds its own prices on top.

N39 in one day

Peak is business days only. All other times are off-peak.

What the network charges

Daily
15044.7 c/day
High-season peak
2.56289 c/kWh
Low-season peak
2.49293 c/kWh
Off-peak
2.33662 c/kWh
High-season demand
41.14 c/kVA/day
Low-season demand
40.557 c/kVA/day

When the rates apply

Peak is 16:00–20:00 on business days. All other times are off-peak. The same clock times apply in standard time and daylight saving time. Demand is set from the highest 30-minute kVA reading in the peak period.

Illustrative example

Reduce an N39 summer kVA peak

  • The billed peak falls by 50 kVA.
  • The reduction holds for the full 30-minute peak interval.
  • The month has 31 days.
  • Use the N39 high-season network rate.
50 kVA × 41.140 c/kVA/day × 31 days ÷ 100$637.67 difference in the N39 network demand component for that month.

A later peak can set a new maximum. Include sub-transmission connection requirements. This is not a retail saving.

Would a battery help?

A guide, not a quote

Strong fit

Peak-kVA control

A controlled battery may reduce the site maximum, but the bill is based on apparent power. Power factor and reactive load can be as important as battery kW.

A battery can reduce these

  • The active-power contribution to the measured kVA maximum.
  • Peak-period grid energy when the battery discharges at the same time.
  • Solar spill that can be stored without sacrificing the required peak reserve.

A battery can’t change these

  • Daily access, metering and other fixed charges.
  • Reactive-power demand unless the inverter and control design explicitly provide power-factor support.
  • A new maximum created after the battery empties or misses dispatch.

You’d need to check

  1. At least 12 months of interval data, including every billed maximum.
  2. Demand timestamps, seasonal windows and billing reset rules.
  3. kW, kVA, kvar and power-factor data at the billing meter.
  4. Retailer rates plus the network tariff—not a blended cents-per-kWh assumption.