A new utility tender every Monday. Set your core steel, flux density, current density, cooling and margin — the engine computes your losses and the utility evaluates your bid at real capitalization rates. Three rivals have already submitted sealed bids. Lowest compliant evaluated cost takes the contract.
Practice game. This is a learning exercise in tender economics using analytical approximations — the losses and evaluated cost are illustrative, not a real bid evaluation or a compliance calculation. For real work, verify against the customer specification and the applicable standard.
| Rating | 100 MVA · 220/33 kV |
| Frequency / phases | 50 Hz · 3-ph |
| Impedance window | |
| Max NLL guarantee | |
| Max LL guarantee | |
| Max noise | |
| Max transport mass | |
| NLL capitalized at | |
| LL capitalized at | |
| Copper this week |
Evaluated cost = bid price + NLL×rate + (LL+cooling aux)×rate. Non-compliant bids are disqualified at design review.
Every choice moves three numbers: what it costs to build, what it burns for 30 years, and whether it passes design review.
| BIDDER | PRICE | NLL | LL+AUX | EVALUATED | STATUS |
|---|
The same physics every design office argues about, reduced to its commercial core.
Push B higher and the core shrinks — cheaper steel bill, but specific losses climb steeply near saturation, and so does noise. Premium grades buy you headroom.
Higher J means less copper to buy but more I²R to burn — and a hot-spot your cooling scheme has to survive. Designers price-walk J right up to the loss guarantee.
Utilities don't buy the cheapest transformer; they buy the cheapest 30 years. $4,500/kW on no-load loss turns 10 kW of core loss into $45,000 of bid handicap.
The weekly DGA case file is waiting in the Test Bay.
Open This Week's Case →