Appendix: source scope and negotiable cost drivers

Separate the publisher's proposition from the paper's proposal. Institutional definitions, methods and warnings retain their original purpose, which may differ from the reader's procurement. A citation neither makes this original worksheet mandatory nor establishes that the reader's tender permits the method. Before using its analytical recommendation for commitment, the decision owner must identify the applicable institution and procedure. That scope distinction is part of the evidence architecture, not a procedural entitlement supplied by publication.

Labelled primary notes support narrow statements; original paragraphs construct comparisons and decision records rather than reproduce institutional instructions. Fictional studies retain declared assumptions and exact bindings. A methodological note supplies no supplier life or energy quantity, while a reproduced fictional cost supplies no empirical magnitude. Keeping those evidence classes distinct allows a reader to challenge the method and the input separately without attributing institutional authority to either original reasoning or authored assumptions.

World Bank procurement material should be read within its stated project-procurement setting. Its discussion of evaluation criteria and lifecycle costing can inform how an analyst frames a comparison. It does not establish that an unnamed private buyer is required to use the same tender architecture, may revise criteria after receiving offers or can reject a supplier through the same process. The paper uses it for narrow methodological support and preserves the need to determine actual authority separately. A cost model must not create a procedural entitlement that the governing procurement conditions do not provide.

UK public appraisal and commercial guidance has a different original audience and mandate. The paper draws attention to its relevant analytical disciplines while retaining those institutional limits. It does not import a government discount rate, a procurement threshold, a mandatory contracting route or a universal approval sequence. The buyer's own appraisal mandate and applicable process should govern those choices. An evaluator can learn from an external method without borrowing the institution's authority. The source's scope belongs beside the point of use, particularly when a recommendation could change the comparison or commitment.

US federal energy lifecycle and measurement guidance should also retain its purpose. A dimensional or verification principle can help the reader ask a better question, but a federal programme convention is not automatically the correct assumption for another currency, asset or purchaser. The paper's fictional rates and energy quantities are not taken from the public guidance as recommended parameters. They exist to isolate mechanisms. An actual energy comparison needs relevant duty, monetary basis and measurement, with any programme requirements established through the institution that has authority over the project.

Technical and project-management guidance can define service, assumptions, dependencies and evidence categories. It cannot establish supplier acceptability, recoverable outage or executable schedule for this procurement. The requirement owner must supply the relevant evidence in the original records. A handbook makes the category intelligible while its transaction-specific contents remain unresolved; its useful contribution is to improve the question the owner must answer.

An arithmetic reversal boundary is useful only when the procurement team understands who can influence the varied driver. The tariff cases change the same electricity price for both offers while retaining their consumption. A supplier may be able to warrant consumption under a defined duty, but may not control the buyer's future tariff. A commercial proposal to reduce energy use and a proposal to transfer tariff exposure are different mechanisms. The buyer should identify which mechanism is offered, which quantity can be evidenced and where any retained exposure belongs in the comparison.

The downtime cases also change a common rate while retaining bid-specific downtime. That rate represents the buyer's declared consequence per lost hour, not a supplier penalty automatically payable for every outage. An availability clause can allocate only the events and consequences within its actual perimeter. Receiving constraints, operating practices, external power and access conditions may affect a loss that the supplier does not control. The comparison should connect the loss event, attribution rule, evidence and actual recovery right before treating a contractual remedy as equivalent to avoided operating loss.

The terminal cases vary the Transferable offer's residual alone. A residual credit requires a defined asset, ownership and permitted disposition at the stated horizon. A technical design that remains functional does not by itself establish a saleable interest, buyer access or an executable transfer. Nor does a seller's indicative resale statement establish the amount or timing assumed in the model. The buyer should retain the claimed entitlement and evidence needed for the credit separately from the arithmetic equality. If that evidence is absent, the appropriate case may omit or condition the credit rather than preserve it to defend the ranking.

A service equalisation adjustment has another owner. If a lower-cost bid does not meet the common service, the buyer must identify the feasible additional equipment, integration and duties that would make it comparable. An analyst-selected cost allowance without a complete configuration does not close the physical gap. Conversely, charging the same supporting work twice can penalise an otherwise comparable offer. Equalisation should therefore identify the receiving service, included and excluded scope, physical capability, incremental incidence and authority to adopt the changed configuration. The cost comparison follows that configuration rather than creating it.

The negotiator should turn each boundary into an answerable request. Ask the party that controls consumption to supply the corresponding duty and verification basis. Ask the consequence owner to reconcile the loss measure. Ask the entitlement owner to support a terminal credit. Ask the requirement owner to accept the equalised service and identify unresolved feasibility. If no party can supply the decisive premise, retain the conditional ranking and the unresolved duty in the recommendation. A lower calculated lifecycle cost is useful evidence for negotiation; it is not a substitute for the physical service and rights that make the offer usable.