See what solar wheeling could save on your whole electricity bill.

Enter your bill and the wheeling deal on offer. The estimator separates the part of your bill wheeling can reduce from the fixed charges it cannot, then shows the saving on your whole bill.

Every figure below is an editable assumption, not a quote. Change any field and the results update immediately. Defaults are illustrative starting points only, drawn from Eskom's published Megaflex 2025/26 capacity charges where noted.

01 / What you pay nowSplit into what wheeling can and cannot touch

Total electricity spend, last 12 months (R) Total consumption, last 12 months (kWh)

Does the spend above include VAT?

Yes, VAT inclusive (as billed) No, already VAT exclusive

VAT rate (%), assumption

Do you know your fixed, demand, network, service and admin charges from the bill?

Yes, use the Rand total below No, estimate from notified demand (kVA)

Known fixed, demand, network, service and admin charges, last 12 months (R) Notified maximum demand (kVA) Demand / capacity rate, assumption (R / kVA / month): Eskom Megaflex generation, distribution and transmission capacity charges combined

02 / The deal on offerWheeling fee held flat over the term, an assumption

Wheeled solar tariff (R / kWh, assumption) Wheeling fee or use-of-system charge (R / kWh, assumption, set by your utility, not ZenSolar) Wheeling losses (%), assumption Share of annual consumption wheeled solar can realistically supply: unbatteried solar cannot generate through the winter evening peak (roughly 17:00 to 20:00), so this is usually well under 100% 0%60%100% of consumption Contract term (years) 5 years10 years20 years Utility tariff escalation (% / year, assumption) Wheeled tariff escalation (% / year, assumption)

01 / Net annual saving--The bottom line: what wheeling actually saves this year, in Rand

02 / Saving, % of your total bill--The honest headline: net saving as a share of everything you pay, not just the energy line

03 / What wheeling does not touch--Demand, network, service and admin charges: paid in full whether or not you wheel a single kWh

04 / New annual bill under wheeling--Today's bill minus the net saving above

05 / Energy rate (bill-accurate)--The only rate wheeling actually competes against: spend minus fixed charges, divided by kWh

06 / Blended rate (old-style)--Total spend divided by kWh. A naive calculator uses this instead, and overstates the saving by ignoring fixed charges

07 / Saving, % of the energy line only--Bigger and more flattering than line 02. Never presented as the saving off your bill

08 / Fixed charges, % of your bill--How much of every Rand you pay is already locked in before wheeling starts

09 / Wheeled volume--Credited after losses: --

10 / Energy displaced (credit received)--Credited kWh times the bill-accurate energy rate

11 / Cost of wheeled energy--Generator tariff plus wheeling fee, charged on every kWh delivered, not only the credited kWh

12 / Sensitivity: low case--Cumulative net saving over the term at --% utility escalation

13 / Sensitivity: base case--Cumulative net saving over the term at --% utility escalation, as entered above

14 / Sensitivity: high case--Cumulative net saving over the term at --% utility escalation

Year-by-year detail over the contract term

These figures are an estimate based on the assumptions shown above, not a quote. Next: check your saving on the whole bill above, then send it to ZenSolar with the button below. A site-specific proposal replaces these assumptions with your real bill and gives you a firm number.

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