Supply capacity planning calculator

Use this calculator when a site, tenancy, board group or project stage needs a high-level capacity worksheet that includes existing demand, committed future load and a separate planning allowance. The page keeps those values apart so the reserve result can be checked later.

Field Use Cases

This page is not a network capacity decision. It is a record of how entered planning values compare.

Data checklist

The worksheet works best when the available supply value and all load values are current-based and comparable.

Review Workflow

If reserve capacity is below the entered target, treat it as a source-review prompt. It does not identify the only project response.

Worked capacity record

A project worksheet enters 400 A available supply, 210 A existing demand, 65 A committed future load and a 35 A planning allowance. The minimum reserve target is 15%.

The planned load is 310 A, leaving 90 A remaining capacity. The used capacity is 77.5% and the reserve is 22.5%. The reserve margin is 7.5 percentage points above the entered target.

The result is a useful planning record because the present and future loads remain separated. If the future load changes, the worksheet can be updated without reworking the entire project note.

Method boundary

Keeping the method this narrow helps the page support planning without overreaching into network, switchboard or project decisions.

Stop points

• The available supply value has no source record.
• Existing demand, future load and allowance values use different current bases.
• Future loads are speculative but not labelled as an allowance.
• The reserve target is copied without project context.
• The result is being used as a network or switchboard decision.
• Board-specific capacity, maximum demand or staged additions need their own worksheet.

When a stop point appears, keep the exported result as a planning question and resolve the source value before carrying the reserve margin downstream.