{
  "capability_id": "electrical.energy_consumption",
  "tool_id": "energy-consumption",
  "engine": "energy",
  "calculation_version": "1.4.2",
  "generated_at": "2026-09-16T22:03:43.701Z",
  "engine_build": "2026-09-13",
  "test_count": 16,
  "passed": 16,
  "failed": 0,
  "tests_summary": {
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      "total": 9,
      "passed": 9
    },
    "boundary": {
      "total": 3,
      "passed": 3
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    "property": {
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  "engine_tested": true,
  "expert_reviewed": false,
  "internally_reviewed": true,
  "review_kind": "internal",
  "source_checked": true,
  "reviewed_by": "CalculatorX electrical review",
  "reviewer_role": "electrical-engineer",
  "last_reviewed": "2026-09-13",
  "expert_review": {
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    "reviewer": null,
    "note": "Internal domain review completed; not a named external expert review.",
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  "internal_review": {
    "status": "approved",
    "reviewer": {
      "name": "CalculatorX electrical review",
      "role": "electrical-engineer"
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    "reviewed_at": "2026-09-13",
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    "kind": "internal"
  },
  "page": "https://www.calculatorx.com/calc/electric/energy-consumption",
  "api": "https://www.calculatorx.com/api/v1/calc/energy-consumption",
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  "schema_output": "https://www.calculatorx.com/schemas/electrical.energy_consumption.output.json",
  "assumptions": [
    "Constant power over the stated hours.",
    "Month = 30 days, year = 365 days in daily UI projections (presentation-only).",
    "User converts kW→W when needed.",
    "W ≥ 0 and hours ≥ 0 (consumption, not signed energy flow)."
  ],
  "limitations": [
    "Assumes constant power over the stated hours",
    "W and hours must be ≥ 0 (VALUE_MUST_BE_NON_NEGATIVE)",
    "UI daily month/year projections are presentation-only; engine returns period kWh"
  ],
  "boundary_conditions": [
    "Zero watts or zero hours → 0 kWh — soft boundary",
    "Negative W or hours → VALUE_MUST_BE_NON_NEGATIVE",
    "UI daily projections (month/year, ×30 / ×365) are presentation-only; engine returns period kWh",
    "Daily UI: 0 ≤ hours/day ≤ 24 for a single load; period mode accepts any hours ≥ 0"
  ],
  "sources": [
    {
      "title": "NIST Guide to the SI (SP 811)",
      "section": "Energy as power × time; kilowatt-hour",
      "url": "https://www.nist.gov/pml/special-publication-811",
      "supports": "E(kWh) = P(W) × t(h) / 1000; 1 kWh = 3.6×10⁶ J",
      "kind": "reference"
    },
    {
      "title": "BIPM SI Brochure (9th edition, version 4.01)",
      "section": "Derived unit joule and common non-SI kWh",
      "url": "https://www.bipm.org/en/publications/si-brochure",
      "supports": "Energy from watt and hour quantities; 1 kWh = 3.6 MJ",
      "kind": "reference",
      "accessed": "2026-09-05",
      "published": "2026-06",
      "doi": "https://doi.org/10.59161/AUEZ1291"
    },
    {
      "title": "IEC 60050 — International Electrotechnical Vocabulary",
      "section": "Active energy (IEV 131-11-57)",
      "url": "https://www.electropedia.org/iev/iev.nsf/display?openform&ievref=131-11-57",
      "supports": "Active energy W = ∫p dt; SI unit joule",
      "kind": "standard",
      "accessed": "2026-09-05",
      "clause": "IEV 131-11-57"
    },
    {
      "title": "IEC 60050 — International Electrotechnical Vocabulary",
      "section": "Watt hour (IEV 131-11-58)",
      "url": "https://www.electropedia.org/iev/iev.nsf/display?openform&ievref=131-11-58",
      "supports": "1 Wh ≔ 3600 J; kWh is the common billing multiple. E(kWh) = P(W)×t(h)/1000 at constant power",
      "kind": "standard",
      "accessed": "2026-09-05",
      "clause": "IEV 131-11-58"
    }
  ],
  "methods": [],
  "fingerprint": "sha256:12b8656c5419669724d3a3f6bedfd69f11c8f1e6df1e20e231487fb250072916",
  "tests": [
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      "ok": true,
      "kind": "golden",
      "inputs": {
        "W": 1500,
        "hours": 3
      },
      "expect": 4.5,
      "expectWarning": null,
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      "tol": 0.001
    },
    {
      "id": "9W-8h",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "W": 9,
        "hours": 8
      },
      "expect": 0.072,
      "expectWarning": null,
      "actual": 0.072,
      "tol": 0.001
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    {
      "id": "1000W-1h",
      "ok": true,
      "kind": "golden",
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        "hours": 1
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        "hours": 5
      },
      "expect": 0.3,
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      "tol": 0.001
    },
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      "id": "linear-2x-W",
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        "W": 3000,
        "hours": 3
      },
      "expect": 9,
      "expectWarning": null,
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      "tol": 0.001
    },
    {
      "id": "linear-2x-h",
      "ok": true,
      "kind": "golden",
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        "hours": 6
      },
      "expect": 9,
      "expectWarning": null,
      "actual": 9,
      "tol": 0.001
    },
    {
      "id": "soft-zero-W",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "W": 0,
        "hours": 3
      },
      "expect": 0,
      "expectWarning": null,
      "actual": 0,
      "tol": 1e-12
    },
    {
      "id": "soft-zero-h",
      "ok": true,
      "kind": "golden",
      "inputs": {
        "W": 1500,
        "hours": 0
      },
      "expect": 0,
      "expectWarning": null,
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      "tol": 1e-12
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    {
      "id": "neg-W",
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      "kind": "boundary",
      "inputs": {
        "W": -500,
        "hours": 2
      },
      "expectError": "VALUE_MUST_BE_NON_NEGATIVE",
      "code": "VALUE_MUST_BE_NON_NEGATIVE",
      "error": "W must be ≥ 0"
    },
    {
      "id": "neg-hours",
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        "W": 500,
        "hours": -2
      },
      "expectError": "VALUE_MUST_BE_NON_NEGATIVE",
      "code": "VALUE_MUST_BE_NON_NEGATIVE",
      "error": "hours must be ≥ 0"
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      "id": "2000W-24h",
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        "hours": 24
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      "expect": 48,
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      "id": "missing-W",
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      },
      "expectError": "MISSING_REQUIRED_INPUT",
      "code": "MISSING_REQUIRED_INPUT",
      "error": "W is required"
    },
    {
      "id": "property-kwh",
      "ok": true,
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      "detail": "E = P·t / 1000",
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    },
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      "id": "property-linear-power",
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      "detail": "E(2t)=2E(t)",
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    },
    {
      "id": "property-default",
      "ok": true,
      "kind": "property",
      "detail": "1500 W × 3 h",
      "expect": 4.5,
      "actual": 4.5
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