Free corporate power tool

PPA and wheeling savings calculator.

Compare the buyer’s current grid-only cost with a wheeled renewable supply case after PPA energy, network and service charges, and residual grid supply.

How the buyer comparison is built

The screen starts with the current grid-only bill, rebuilds the renewable case after network and residual supply costs, then shows the saving and the PPA price at which that saving disappears.

1 · Grid-only baselineGrid-only cost = Annual load × 1,000 × Benchmark tariffThe 1,000 converts MWh to kWh.
2 · Wheeled supply costTotal with wheeling = PPA energy cost + Network/service cost + Residual grid cost
3 · Buyer savingAnnual saving = Grid-only cost − Total with wheeling
4 · Break-even PPA price
Break-even PPA price=Grid-only cost − Network cost − Residual grid costDelivered renewable kWh
Above this PPA price, the wheeled case no longer beats the grid-only benchmark on the assumptions entered.
  • It assumes annual energy quantities rather than interval settlement.
  • Demand charges, time-of-use shape, surplus treatment, imbalance, taxes and tariff-block effects are not modelled separately.
  • The break-even PPA price is the energy price that leaves the buyer level with the grid-only benchmark on the assumptions entered.
Use current supplier, municipal, Eskom, trader and contract schedules for a live case. This screen is for an early commercial comparison, not a quotation or legal interpretation.

When annual MWh is not enough

Most real wheeling questions are about timing.

Two cases can have the same annual renewable share and very different buyer savings. Half-hourly or hourly load, generator profile, time-of-use tariffs, demand charges, loss factors and settlement rules decide how much energy actually offsets the expensive parts of the bill.

Read the wheeling economics guide or inspect the public PPA and wheeling model.

Use actual bills and interval data

Want the delivered-cost case rebuilt from the real tariff and load profile?

Send the buyer bill, interval data, proposed PPA price and the network or trader assumptions you have.

Discuss a PPA reviewPPA & wheeling service