Why Webill Green
South Africa's electricity market is being built now. Webill Green is one of very few platforms that can carry a trade through it from end to end, and the only one we know of that does it on a single ledger, for every party.
A traded kilowatt-hour needs ten jobs done, in order, for every party, every month. Most tools do one or two of them; spreadsheets carry the trade between the rest.
Wheeling and matching software
Virtual Wheeling data platforms
The Market Operator's exchange
Billing systems
Certificate registries
Every claim on this page points at something that exists in the product today, or says plainly when it is still to come.
Bilateral PPAs, Eskom Virtual Wheeling, wholesale trades, network charges and certificates settle in one engine and land on one double-entry ledger. The month closes once, every party sees the same figures, and the Money Room builds its profit and loss from the same documents.
See a settled daySettled on the same ledger
Every line has a partner. Σ = R 0.00 ✓
A wheeled kilowatt-hour can cross Eskom's network and a municipality's. Webill Green routes across both, applies each network's losses and charges exactly once, and pairs every charge with the buyer line that pays it.
Follow the routeOne wheeled day, charged once per network
The Market Operator runs SAWEM's exchange. Webill Green is the participant's side of it, built to Market Code revision 2.3 and rehearsed every day against a simulated market of fifty participants. When the market opens, the desk is already built and rehearsed.
The market day, gate by gateThe participant side of SAWEM
Webill Green is not a generator, a trader or a wires owner, and it takes no position. A trader's platform serves its own book; Webill Green settles for the IPP, the trader and the buyer on the same terms, so both sides of a deal can sign the same statement.
Every seat it servesWho settles on it
What it never does
Tariffs, loss factors, network charges, tax rates and draft trading rules live as effective-dated rows, not code. When NERSA finalises a rule or Treasury moves a rate, a row changes, and every past period still settles on the rules of its own dates.
The changes comingRules as rows
| Rule | Value | Status |
|---|---|---|
| Contestable customers | from 1 MVA | Draft |
| Generators covered | above 100 kW | Draft |
| Carbon tax, 2026 | R 308 a tonne | Law |
| Carbon tax, 2030 | R 462 a tonne | Law |
| Basic allowance, to 2030 | 60% | Law |
NERSA's draft framework keeps automated trading off SAWEM for its first five years. Webill Green already works that way: engines compute, people approve, and four eyes sit on every limit. Every statement and pack carries a SHA-256 audit index and rebuilds byte for byte from its evidence.
Evidence and controlsOnly a person moves a statement to FINAL
Four eyes on
The rules arrive in stages. The platform that has to run them is built now, so each stage is a switch-on rather than a project.
Built and rehearsed today
What the market still has to do
Now
NERSA finalises the trading rules and the trading-platform framework.
April 2027
SAWEM opens, in phases, with full competition towards 2030.
By 2029
An independent Transmission System Operator takes over the grid.
To 2030
The carbon tax climbs to R 462 a tonne.
The core is the same in every market: contracts, interval matching, a double-entry ledger, invoices and evidence. Each market changes the shell around it: the settlement grain, the operator, the certificates and the tax. Britain calls it a sleeved PPA. The engine does not care.
The core that travels unchanged
1
20-minute wheeling intervals, hourly market periods
Wheeling over Eskom and municipal networks, Eskom Virtual Wheeling, SAWEM from 2027, I-RECs and the carbon tax.
2
Half-hourly settlement under the Balancing and Settlement Code
One national price, every meter moving to half-hourly data by 2027, corporate PPAs sleeved through licensed suppliers, REGO certificates and the UK ETS.
Webill Green brings interval-matched sleeving settlement and one invoice per counterparty, for independent generators and the suppliers who sleeve for them.
3
15-minute settlement in ERCOT
One market and one regulator, retail choice, nodal prices, real-time co-optimisation since December 2025, virtual PPAs as the corporate route and RECs tracked by ERCOT itself.
Webill Green brings virtual PPA settlement, REC accounting and invoice-grade statements, in dollars.
4
15-minute day-ahead coupling across Europe since October 2025
One of Europe's largest PPA markets, with one regulator and one grid operator, guarantees of origin and the EU ETS.
Webill Green brings PPA settlement at 15-minute grain, guarantees of origin and invoices in euros.
5
5-minute settlement in Australia; 48 half-hour periods in New Zealand
Australia's gross pool with regional prices, loss factors and large-scale generation certificates; New Zealand's nodal market, where new rules from July 2026 give independents hedges on equal terms.
Webill Green brings retailer sleeving settlement and certificate handling, entered as one region.
Each market runs as its own deployment, in its own currency, time zone and rules. Great Britain and Texas run today as preview deployments; each launch waits on a licensed local partner.
A walkthrough runs the whole chain, from a meter reading to an invoice, on the platform itself.
