Facilities & Energy

Energy Savings & CO₂ Calculator

Constant load, operating hours and tariff are assumed.

This selection changes review context only. Formulas and example inputs stay unchanged. Check the model assumptions and applicability for the actual process.

Identify the actual asset, process, work boundary, source documents, units and assumptions. Confirm that the selected model or template applies before using its results.

1 Inputs

Minimum: 0

Minimum: 0

Minimum: 0

Minimum: 0 · Maximum: 100

Minimum: 0

2 Results

Annual cost savings
$9,450
Baseline energy
450,000 kWh
Baseline cost
$63,000
kWh saved / yr
67,500
CO₂ avoided / yr
27 t
ΔC = P × h × p × r; CO₂ = ΔE × f / 1000
Constant load, operating hours and tariff are assumed. Reduction applies to the baseline energy; carbon uses your grid factor. Check measured bills and operating schedules before treating the scenario as a forecast.

Worked example

Example values are illustrative. Replace them with your measured data.

InputValue
Equipment load75 kW
Operating hours per year6000 h/yr
Electricity tariff0.14 $/kWh
Expected reduction15 %
Grid emission factor0.4 kg CO₂/kWh

Annual cost savings: $9,450

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About this calculator

How it works

You enter equipment load (kW), operating hours, electricity tariff, expected reduction (%) and grid emission factor. Baseline energy = load × hours. Saving = baseline × tariff × reduction. CO₂ avoided = kWh saved × emission factor.

Worked example (illustrative inputs)

75 kW × 6,000 h = 450,000 kWh, costing $63,000 at $0.14. A 15% reduction saves 67,500 kWh and $9,450 per year, and 27 t CO₂ at 0.40 kg/kWh.

How to read the result

The result is linear in every input, so the reduction percentage matters most. The tool also shows the ten-year figure before tariff changes.

When to use it

Use it for a first estimate of any efficiency measure. Use a measured reduction where you can, and your own grid's emission factor.

À propos de ce calculateur

Traduction (brouillon) — à relire.

Fonctionnement

Vous saisissez la charge de l'équipement (kW), les heures de fonctionnement, le tarif électrique, la réduction attendue (%) et le facteur d'émission du réseau. Énergie de référence = charge × heures. Économie = référence × tarif × réduction. CO₂ évité = kWh économisés × facteur d'émission.

Exemple chiffré (valeurs d'illustration)

75 kW × 6 000 h = 450 000 kWh, soit 63 000 $ à 0,14 $. Une réduction de 15 % économise 67 500 kWh et 9 450 $ par an, et 27 t de CO₂ à 0,40 kg/kWh.

Lire le résultat

Le résultat est linéaire pour chaque entrée : c'est le pourcentage de réduction qui pèse le plus. L'outil affiche aussi le montant sur dix ans, hors évolution du tarif.

Quand l'utiliser

Utilisez-le pour une première estimation de toute mesure d'efficacité. Préférez une réduction mesurée et le facteur d'émission de votre propre réseau.

حول هذه الحاسبة

ترجمة (مسودة) — للمراجعة.

طريقة الحساب

تُدخل حمل المعدة (kW) وساعات التشغيل وتعرفة الكهرباء ونسبة الخفض المتوقعة (%) ومعامل انبعاث الشبكة. طاقة الأساس = الحمل × الساعات. التوفير = الأساس × التعرفة × الخفض. CO₂ المتجنَّب = kWh الموفّرة × معامل الانبعاث.

مثال محسوب (قيم توضيحية)

75 kW × 6000 ساعة = 450,000 kWh بتكلفة 63,000 $ عند 0.14 $. خفض 15% يوفّر 67,500 kWh و9450 $ سنويًا، و27 طنًا من CO₂ عند 0.40 kg/kWh.

قراءة النتيجة

النتيجة خطية في كل مدخل، لذا فنسبة الخفض هي الأهم. وتعرض الأداة أيضًا الرقم على عشر سنوات دون احتساب تغيّر التعرفة.

متى تستخدمه

استخدمها لتقدير أولي لأي إجراء كفاءة. استخدم خفضًا مقيسًا متى أمكن، ومعامل انبعاث شبكتك أنت.

In one line

Constant load, operating hours and tariff are assumed. Reduction applies to the baseline energy; carbon uses your grid factor. Check measured bills and operating schedules before treating the scenario as a forecast.

Worked example

EXAMPLE

Illustrative values (the calculator defaults), not data from a real site.

Inputs
Equipment load75 kW
Operating hours per year6000 h/yr
Electricity tariff0.14 $/kWh
Expected reduction15 %
Grid emission factor0.4 kg CO₂/kWh
Results
Annual cost savings$9,450
Baseline energy450,000 kWh
Baseline cost$63,000
kWh saved / yr67,500
CO₂ avoided / yr27 t

Frequently asked questions

How do I estimate the expected reduction percentage?

Use vendor-published efficiency gains for the specific measure — variable-speed drives and high-efficiency motors are often quoted at 15 to 30%, LED lighting retrofits typically cut lighting load 40 to 60%. Where possible, run a short measured trial against your current baseline rather than relying only on vendor claims.

What emission factor should I use for my location?

Use the kg CO2 per kWh figure published by your utility or a national or regional energy agency for your specific grid, since it varies enormously by fuel mix — coal-heavy grids often exceed 0.7 kg/kWh while grids with a lot of hydro, nuclear or renewables can fall below 0.1.

Does this account for demand charges, or only energy charges?

No, this tool models only the per-kWh energy cost, not demand charges — the separate fee many commercial tariffs charge for peak kW draw. If your efficiency measure also reduces your peak demand, use the demand charge savings calculator alongside this one for the full picture.

Why does the tool assume constant operating hours and tariff?

It is a simplified annual estimate meant for early-stage business-case screening, not a full engineering model. Real savings will vary with seasonal operating patterns and future tariff changes — treat the output as a reasonable planning-level figure, not a guaranteed number.

Is this the same calculation ISO 50001 requires for reporting?

It follows the same baseline-versus-improved-performance logic ISO 50001 uses for an Energy Performance Indicator, but a formal ISO 50001 EnPI typically also normalizes for factors like production volume or weather. This tool is a simpler standalone estimate suitable for scoping a project before a full EnPI is built.

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