Johannesburg
--:--SAST
Trading period -- of 24 is in delivery
Next day-ahead gate at 10:00 SAST
Next intraday auction
SAWEM is scheduled to open in April 2027. Until then, market lines run on the simulator.
Webill Green is one of very few platforms built to run South Africa's electricity trade end to end. It meters, routes, settles and bills for independent power producers, off-takers and traders, and prepares the carbon-tax return for companies that emit, all on one record every party can check.
| Party | Line | Amount |
|---|
Illustrative contract: a hybrid solar-and-wind farm sells to a factory at 85.0 c/kWh, wheeled over Eskom's network and a municipal network. Today's generation and demand are modelled, not metered. Prices, losses and the grid comparison follow the platform's worked examples.
A traded kilowatt-hour needs ten jobs done, in order, for every party, every month. Webill Green is one of very few platforms built to do all ten, and the only one we know of that does them on a single ledger.
Wheeling and matching software
Virtual Wheeling data platforms
The Market Operator's exchange
Billing systems
Certificate registries
Bilateral PPAs, Eskom Virtual Wheeling, wholesale trades and carbon settle in one engine. The month closes once, and every party sees the same figures.
See a settled dayRoutes run across Eskom's network and the municipalities', with each network's losses and charges applied exactly once, and every charge paired on the ledger.
Follow the routeThe participant side of SAWEM is built to Market Code revision 2.3: day-ahead and intraday bids, credit cover, imbalance and settlement statements, rehearsed every day on a 50-participant simulator. The live link waits only on the Market Operator's interface.
The market day, gate by gateWebill Green is not a generator, a trader or a wires owner. A trader's platform serves its own book; Webill Green settles for the IPP, the trader and the buyer on the same terms.
What it will never doTariffs, loss factors, network charges and draft trading rules live as effective-dated data, not code. When NERSA finalises a rule, a row changes, and every past period still settles on the rules of its own dates.
The changes comingNERSA's draft framework keeps automated trading off SAWEM for its first five years. Webill Green already works that way: engines compute, people approve with four eyes on every limit, and every pack rebuilds byte for byte from its evidence.
Evidence and controlsBehind it: 24 domains, more than 8,000 automated tests, and a simulated market that runs a month in seconds. Next: Great Britain, Texas, Spain, Australia and New Zealand.
See the Webill edge in fullFor most of its history, South African electricity had one seller. Since the licensing cap on private generation was removed at the turn of 2023, private generators, licensed traders and large buyers have been contracting with one another directly, and every one of those deals has to be metered, settled, invoiced and proved.
Today that work lives in spreadsheets, hand-built back offices and a separate vendor portal for each counterparty. Webill Green replaces them with one engine for the whole book: bilateral PPAs, Eskom Virtual Wheeling, wholesale trading and carbon, on one ledger.
2022 to 2023
The licensing cap on private generation is removed.
1 Jan 2025
The Electricity Regulation Amendment Act comes into force.
3 Mar 2025
NERSA approves the wheeling rules.
Jan 2026
Phase two of the carbon tax begins.
Feb 2026
Market Code revision 2.3 is published.
Apr 2027
SAWEM, the wholesale market, is scheduled to open.
Read the century behind these dates, and the changes still coming
| Where the work lives today | On Webill Green |
|---|---|
| A spreadsheet for every bilateral contract. | One engine for the whole book. PPAs, Virtual Wheeling, market trades and carbon settle on one ledger. |
| A vendor portal for each network and counterparty. | Routes across both networks, Eskom's and the municipalities', with each network charging once. |
| Month-end reconciliations that never quite agree. | One deterministic period close and one invoice per counterparty. |
| Refunds checked by hand, meter by meter. | Virtual Wheeling refunds matched every 15 minutes and reconciled against Eskom's credit note. |
| A carbon-tax return assembled from inboxes each July. | A return pack that rebuilds identically from its evidence, ready for the company to review and file. |
Every screen in Webill Green is a stop on the same road. A reading enters at the meter and leaves as a line on a statement that both parties can sign.
1 of 7
Your organisation, its sites and meters, the tariffs in reach and the feeds that bring readings in. From the moment a meter is assigned, its readings become 20-minute intervals that everything downstream uses.
Where you work: Organization, Off-taker Sites, IPP Sites
2 of 7
Find a counterparty, send a proposal, negotiate the terms and sign. On its start date the contract goes active and becomes a standing instruction to the settlement engine.
Where you work: Deals, with its Proposals, Negotiations, Contracts and Disputes
A physical PPA on its way to active
PPPA-202607-138209764
Physical and virtual PPAs between IPPs, traders and off-takers: eight deal types, one engine. An agreed deal left unsigned for 10 days is suspended.
3 of 7
Each book forecasts and allocates its portfolio every night: where energy will flow, what margin it earns and what is at risk. Simulate a deal before you sign it. A simulation is a rehearsal; it does not sign a contract.
Where you work: IPP Sites, Trader Pools, the Sales and Procurement Desks
Allocation runs in a published order
Priority buyers are served first, in full.
Pro rata buyers share what is left in proportion.
Fixed is a cap, not a delivery guarantee.
Surplus is energy still to sell.
4 of 7
Flexible members declare next month's volumes. A submitted nomination is binding: settlement reads it where no meter can speak, such as a trader's book, and imbalance is judged against it.
Where you work: Trader Pools and the nominations desk. Proposals for next month arrive on the 20th.
One day of a nomination, MWh per trading period
5 of 7
Your BRP seat bids the book's net position into the day-ahead auction before 10:00 SAST the day before, corrects undelivered hours in five intraday auctions, follows the System Operator's instructions and accrues imbalance where actuals drift from schedule.
Where you work: Market, Bid Desk, Month Simulated until SAWEM opens
The SAWEM clock, in SAST
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When a period closes, the engine resolves what each meter or nomination says, matches supply to demand, applies losses and network charges and prices the contract's terms. It adjusts for spill, shortfall, curtailment and banking, then writes a ledger whose lines sum to zero.
Where you work: Deals, Contracts, and each site's Commercial tab
7 of 7
Each party receives an immutable, versioned statement: the same ledger, filtered to what it owes and is owed. A FINAL statement is never edited. A correction is a new version, and a dispute reopens a period deliberately, never silently.
Where you work: Billing and the Money Room
Wheeled power crosses Eskom's network and often a municipality's. Webill Green applies each network's losses and charges exactly once, and proves the day with a ledger that sums to zero.
Wind farm, Atlantis
Sells at 85.0 c/kWh
554,104 kWh generated
Data centre, Midrand
Buys on delivered energy
38,933 kWh used
| Period | Matched kWh | Delivered kWh | At 85.0 c |
|---|---|---|---|
| Peak | 9,333.333 | 8,773.333 | R 7,457.33 |
| Standard | 20,533.333 | 19,301.333 | R 16,406.13 |
| Off-peak | 9,066.667 | 8,522.667 | R 7,244.27 |
| Total | 38,933.333 | 36,597.333 | R 31,107.73 |
| Party | Line | Amount |
|---|---|---|
| Wind farm | Energy, three TOU lines | +R 31,107.73 |
| Data centre | Energy | −R 31,107.73 |
| Municipal network | Wheeling at 11 c | +R 4,025.71 |
| Data centre | Wheeling | −R 4,025.71 |
| Eskom Transmission | Transmission at 18 c | +R 6,587.52 |
| Data centre | Transmission | −R 6,587.52 |
| Eskom Transmission | Ancillary at 2 c | +R 731.95 |
| Data centre | Ancillary | −R 731.95 |
| Municipal network | Distribution at 13 c | +R 4,757.65 |
| Data centre | Distribution | −R 4,757.65 |
| Σ | Ten lines, five pairs | R 0.00 ✓ |
The Organization app groups its rooms by the work. One organisation can be an IPP, a trader and an off-taker at once, and sees only the rooms its roles need.
Finance, trading and settlement teams at IPPs, traders and large off-takers set the bar. Pick your seat.
Sell the gap.
Your output never matches your contracts. Each interval has to be allocated to the right PPA, curtailment claimed, surplus sold and shortfall covered, and the month closed once, with one invoice per counterparty.
Where you work: IPP Sites, Deals, Bid Desk, Billing
Pay less, and greener.
You need to know whether you are paying less, and greener, than buying everything from the grid, and what to do next. Wheeled credits arrive per TOU period, Virtual Wheeling refunds 45 days after the month, and the municipal bill still has to be checked against interval data.
Where you work: Off-taker Sites, Virtual Wheeling, Money Room
Buy from many, sell to many.
You own no meter and carry both sides of a book. A trade's price matters, but so do its hours: cheap midday solar is a poor answer to an evening shortage.
Where you work: Trader Pools, Bid Desk, Accounts
Bid the day, then answer for it.
As the Balance Responsible Party you balance the books against the market. Bids go in before the 10:00 gate, intraday corrections follow, and every hour's deviation becomes imbalance you must explain.
Where you work: Market, Bid Desk, Month Simulated until SAWEM opens
Are we ahead, and why?
You need one period close you can defend, documents that match the settlement, and a trail an auditor can read without a guide.
Where you work: Money Room, Billing
The July return becomes a printout.
Carbon-tax evidence sits in inboxes and spreadsheets, and the deadline arrives every July. Mistakes happen because the evidence was scattered, not because the arithmetic is hard.
Where you work: Tax, Certificates, Carbon Market Tax pack: planned
South Africa's carbon tax rises every year and is filed each July on SARS eFiling. Webill Green turns a year of facility activity into an explained liability, checks offsets against their caps and builds the return pack with its evidence.
The company reviews, signs and files. Webill Green never holds SARS credentials and never gives tax advice.
Planned: prototyped and tested, not yet commercially released
Carbon tax rate, rand per tonne of CO₂e
Rates are legislated to 2030; the years ahead are drawn dashed.
The wholesale market opens in phases, and much of the platform is shown on a simulated world today. Here is exactly what that means.
Shipped, tested and documented.
Synthetic, and never shown as real traffic.
Ready on our side; waiting on someone else's.
Engines compute; people confirm.
Webill Green takes no side in the trade. It routes, meters, settles and proves for every party, and no network is charged twice. Some things it will never do.
The constants every screen respects.
Webill Green
The traded electricity platform. Locale: South Africa
A walkthrough runs on Webill Green's deterministic demo world: a simulated market of fifty participants, a live 20-minute meter simulator and the screens your team would use. Tell us what you'd like to see and we'll start there.
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