electrical.energy_cost

Three distinct suites: educational examples on the calculator page, this legacy regression count (28/28 golden + boundary), and the CVP verification suite below. They are not the same number. Property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the CVP Manifest . SKIP (0/0) means that suite has no published vectors.

This calculator CURRENT · Public schema 1.4.2 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓

CVP verification suite

Protocol checks from the Evidence Manifest. Distinct from the legacy regression suite above. Verification revision 2026-10-28.meta-metrics-v2. Calculation version 1.4.2. CVP 1.0.0-proposed. 2/2 golden · 12/12 CVP boundary · 21/21 invalid · 5/5 property · 2/2 metamorphic · 3/3 cross-interface · 6/6 CVP contract. digest 20a4dd5b1501.

• Golden (oracle-backed) 2 / 2
• CVP boundary 12 / 12
• Invalid input 21 / 21
• Property 5 / 5
• Metamorphic 2 / 2
• Cross-interface 3 / 3
• CVP contract 6 / 6
• Interfaces PASS · UI (SSR) / REST / MCP
• Interface claim ui-ssr is query-result HTML, not a live browser session. Public share URLs use UI ids (powerInput/hoursInput/daysInput/kwhInput/rateInput). CVP-IFACE includes those serialized queries, not only canonical engine keys.
• Assurance Engineering

• release artifacts aligned PASS
• schema output required declared PASS
• schema valid input executes PASS
• engine success output validates schema PASS
• schema rejects incomplete input PASS
• rest success payload validates schema PASS

Fingerprint sha256:1d89897cd7c3a32f55a70b81d1f55258199ef0655d42352bb14163bbd0d01192

Input schema sha256:12262cc56ba4bd37d19d307cb4bd0bc5d9dce4fde5270bd9146c57e088dabaf9 · Output schema sha256:e11e90e9c7aa944658f65c395d04a726024128cf3a15b9b48dae535fb46aa2fa · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Tool

energy-cost

Engine

energy-cost

Engine build

2026-09-13

Evidence core

2026-09-13T13:02:01.815Z

Rendered

2026-11-10T05:18:41.677Z

Last reviewed

2026-09-13

Assumptions

• Constant average power over the period
• Single flat unit rate

Limitations

• Usage cost only — standing charge and tax not included
• W, hours, days, kWh, and rate must be ≥ 0
• Hours per day must be ≤ 24 (HOURS_PER_DAY_OUT_OF_RANGE)
• Zero W/hours/days/kWh/rate → 0