Glossary

limiting load at the very top of a peak; the last line.

Defined in Appendix A

Used in: Section 6, Section 8, Section 13, Appendix A

spreading cost; where a cited source means this, it's written cost allocation.

Defined in Terms used in this paper

Used in: Section 11, Section 13

a stopgap for approved demand that can't be sourced in time, such as machines drawn from the pool or older machines kept past decommission. It works only if arranged before it's needed, and it carries a premium.

Defined in Appendix A

a stopgap for demand that supply can't meet in time. For power, it means temporary on-site generation.

Defined in Appendix B

Used in: Section 5, Section 6, Section 7, Section 8, Section 9, Section 10, Section 13, Appendix A, Appendix B

the last date you can still walk away from an order cheaply. Once it closes, the forecast behind the order is a liability.

Defined in Appendix B

Used in: Section 6, Appendix B

how far size and date may move at each stage. A move inside the band is the plan working; one outside it becomes a priced event recorded against the declaration. Supply signs the same bands.

Defined in Appendix A

Used in: Section 6, Section 8, Appendix A

resource used per unit of driver; here, CPU time per request.

Defined in Appendix A

Used in: Section 1, Section 2, Section 3, Section 5, Section 7, Section 8, Section 9, Section 10, Section 12, Section 13, Section 14, Appendix A

the last date a layer's order can still be placed: its need date minus its cautious lead time.

Defined in Appendix A

Used in: Section 3, Section 6, Section 7, Section 8, Section 9, Section 10, Section 12, Section 13, Appendix A

a supply order or promise, and the last date it can be placed; not the capacity reservation, temporary or static, that the SRE chapter calls a commitment [7].

Defined in Terms used in this paper

Used in: Section 1, Section 3, Section 5, Section 6, Section 7, Section 8, Section 9, Section 10, Section 12, Section 13, Section 14, Appendix A

power an operator has signed for, against power it reports as active. The paper asks each power figure to say which power it means: contracted, provisioned or drawn.

Defined in Appendix B

Used in: Section 4, Section 6, Section 11, Appendix B

the point in the open range a layer is bought up to, set by its ratio.

Defined in Appendix A

Used in: Appendix A

divides a ranked list of asks into funded and unfunded.

Defined in Terms used in this paper

Used in: Section 6, Section 9, Section 10, Section 12, Section 14

the record of which choice was made: what was known, when, by whom, and what would have changed it.

Defined in Appendix A

Used in: Section 8, Appendix A

a signed statement of expected demand for a launch with no history, in units the planner already prices. It firms up in stages.

Defined in Appendix A

Used in: Section 1, Section 3, Section 5, Section 6, Section 7, Section 8, Section 9, Section 10, Section 11, Section 12, Appendix A

where the walk writes its answers. The register holds each declaration's owner, stage, ranges, bands and shapes. The map holds each layer's lead times, need date, commit point and instrument. The ledger holds each ask's path from approved to net, committed, allocated, delivered, live and adopted.

Defined in Appendix A

Used in: Section 8, Section 9, Section 12, Appendix A

what sizes a layer (region, redundancy tier, hardware class and power density, data stored). Memory drives a high-memory order; region drives power and network.

Defined in Appendix A

Used in: Section 8, Appendix A

the tiers under which Dominion Energy reports its data-center contract capacity, by firmness, in its own order [92]. By its account, an engineering letter pays for the utility's engineering studies and doesn't oblige the customer to proceed. A construction letter commits the customer to repay the utility's investment, and the utility reserves capacity for it. The electric service agreement is the legal document that sets the contracted capacity, and service needs one [92].

Defined in Appendix B

Used in: Appendix B

the capacity budget for a planning horizon. A layer committed before any declaration exists is sized on the portfolio envelope, and the launch's claim on it is recorded.

Defined in Appendix A

Used in: Section 4, Section 5, Section 6, Section 8, Section 9, Section 10, Appendix A

the three slices of each layer. Firm covers up to the base, as a plain order. Flexible covers from the base up to the cover-to point, as options, cancelable or reschedulable orders, or a named launch reserve. Named covers the rest, as a bridge with an owner and a ready-by date and, at the very top, admission control.

Defined in Appendix A

Used in: Section 1, Section 3, Section 5, Section 6, Section 8, Section 9, Section 10, Section 12, Appendix A

how far supply has moved toward use. Supply firms up in stages of its own: planned, contracted, under construction, delivered, live.

Defined in Appendix B

Used in: Section 6, Section 9, Appendix B

the standing executive body that owns the ranked list and the cut line (mechanism 10).

Defined in Terms used in this paper

Used in: Section 6, Section 7, Section 9, Section 10, Section 12, Section 14

carrying approved demand through allocation, delivery and turn-up to use (Figure 15, steps 3–6).

Defined in Terms used in this paper

Used in: Section 6, Section 7, Section 8, Section 9, Section 10, Section 12, Section 13, Section 14, Appendix A

a large new load, such as a data center, connects through the utility's own process. New generation and storage join the grid through a separate interconnection queue. Their waits are different measures.

Defined in Appendix B

Used in: Appendix B

capacity held against a declared high scenario.

Defined in Appendix A

Used in: Section 5, Section 6, Section 8, Appendix A

how long a supply layer takes from order to arrival. A cautious lead time sits near the slow end of what's been seen.

Defined in Appendix B

Used in: Section 1, Section 3, Section 6, Section 8, Section 9, Section 10, Section 12, Section 13, Section 14, Appendix A, Appendix B

the checks before launch; a canary is a small first release to real traffic.

Defined in Appendix A

Used in: Appendix A

a tariff's floor on the bill, set as a share of contract capacity.

Defined in Appendix B

Used in: Appendix B

a shortfall named in supply's answer: how much, by when, why, and a proposed bridge with its owner.

Defined in Appendix A

Used in: Section 6, Section 8, Section 9, Section 14, Appendix A

the date a layer must be in place: the start of the layer after it, not launch day.

Defined in Appendix A

Used in: Section 6, Section 8, Section 9, Appendix A

the walk-through's invented common unit. A standard machine of 50 cores and 200 GB is 1 NMU; a high-memory machine of 50 cores and 600 GB is 1.4.

Defined in Appendix A

Used in: Section 6, Section 7, Section 8, Appendix A

an order that can't be walked away from once placed.

Defined in Appendix B

Used in: Appendix B

the net need is the target, minus what's on hand, on order or due back from reclaim. Then add capacity due to retire that current load depends on. Each of those is a forecast, with a date and an owner.

Defined in Appendix A

Used in: Section 6, Section 8, Appendix A

how far the declaration can still move at a commit point. Here it is ten equally likely outcomes, and the plan carries the fifth-lowest as the base.

Defined in Appendix A

Used in: Section 6, Section 8, Appendix A

a small payment now for the right, but not the duty, to buy later. For most hardware it's a cancelable or reschedulable order.

Defined in Appendix A

Used in: Section 6, Section 8, Appendix A

linking every order to the declaration it was placed for. Then a late delivery can be traced to the launches it hits, and a slipped launch's supply handed to another (re-pegging).

Defined in Appendix A

Used in: Section 6, Section 8, Section 9, Section 10, Appendix A

demand that lasts years, and demand that lasts days. A launch can be both, a spike on a step.

Defined in Appendix A

Used in: Appendix A

the regional grid operator to which Dominion Energy submitted the documentation cited in B.4 [92].

Defined in Appendix B

Used in: Appendix B

three kinds of large electrical gear, named as their source names them [61].

Defined in Appendix B

Used in: Appendix B

a change outside the band, recorded against the declaration and charged under the rule agreed with finance.

Defined in Appendix A

Used in: Section 6, Section 8, Appendix A

the established markets JLL's outlook groups as primary; its wait figure covers those markets, not every location [60].

Defined in Appendix B

Used in: Appendix B

the date capacity must be live, ahead of launch by the testing the launch needs.

Defined in Appendix A

Used in: Section 8, Appendix A

capacity taken back from a tenant that no longer needs it, such as another tenant's cleanup. Until it arrives it is a forecast, with a date and an owner.

Defined in Appendix A

Used in: Section 6, Section 8, Section 9, Appendix A

a lessee's promise to make up any shortfall if the leased asset is worth less than an agreed amount at the end of the lease.

Defined in Appendix B

Used in: Section 6, Appendix B

requests per second, the case's unit of volume; the tables give thousands.

Defined in Appendix A

Used in: Appendix A

the cost of running short against the cost of holding spare. A ratio of k : 1 covers the fraction k/(k + 1) of the range. Illustratively, for persistent demand in a growing business, the ratio is 1 : 1 for turn-up (the median; for turn-up it sets how much rate to staff). The same illustration gives 4 : 1 for machines (0.8, the eighth-lowest of ten), and 19 : 1 for power and shell (0.95).

Defined in Appendix A

Used in: Section 6, Section 8, Appendix A

how firm a declaration is. Intent: a step is coming, with a size range and a half-year or year. Dated: a quarter, base and high scenarios, and the attributes that drive slow supply. Configured: regions, shapes, ramp and peak shape. Live: real traffic in a first phase. Organic: the step has become part of the trend, and the declaration closes.

Defined in Appendix A

Used in: Section 1, Section 3, Section 5, Section 6, Section 7, Section 8, Section 9, Section 10, Section 11, Section 12, Section 13, Appendix A

how past declarations made at that stage turned out. The ranges below come from it, not only from the team's word.

Defined in Appendix A

Used in: Section 5, Appendix A

ready machines held in stock for many tenants. A draw on it leaves a replenishment owed, with a date and an owner.

Defined in Appendix A

Used in: Section 7, Section 8, Appendix A

one kind of supply with its own lead time: power and positions (places for machines in a hall), network, each machine shape, turn-up, job placement and admission.

Defined in Appendix A

one kind of supply with its own lead time: land, power and buildings; network; machines and parts; turn-up; placement.

Defined in Appendix B

Used in: Section 3, Section 6, Section 8, Section 9, Section 10, Section 12, Appendix A, Appendix B

for each line, a dated commit (quantity, date, confidence, any substituted shape) or a named gap.

Defined in Appendix A

Used in: Section 8, Appendix A

a commitment owed whether the demand behind it arrives or not.

Defined in Appendix B

Used in: Section 6, Appendix B

when a commit point comes before the event that would size its layer, are these. 1, ask for the decision earlier; 2, buy an option that carries the commitment past the event; 3, commit to the stage's record and name the owner of the residual.

Defined in Appendix A

Used in: Appendix A

installing and testing delivered machines so they can go live. It's a rate, set by crews, test positions and ports, not an order.

Defined in Appendix A

installing and testing delivered machines so they can go live.

Defined in Appendix B

Used in: Section 5, Section 6, Section 8, Section 9, Section 13, Appendix A, Appendix B

one unit of the staffed turn-up rate, booked ahead like an appointment.

Defined in Appendix A

Used in: Appendix A

unattributable cost, apportioned by declared policy (the cost-tool sense, not the physical one). Like the unused line, it is owned (mechanism 4).

Defined in Terms used in this paper

Used in: Section 7, Section 9, Section 10, Section 12

how long a layer usually takes from order to arrival, and a slow case near the slow end of what's been seen. For example, if machines usually take one quarter but one order in five takes two, plan on two.

Defined in Appendix A

Used in: Section 9, Appendix A