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Power

Energy Cost & PUE

Enter IT power, PUE and tariff and I compute the energy and annual cost, the cooling overhead (PUE−1), DCiE and CO₂ emissions.

kW

Actual electrical load of the IT gear (servers, storage, network).

PUE = total energy ÷ IT energy. Ideal 1.0; typical 1.4–2.0.

$/kWh

Energy price per kWh. Use any currency; the result comes out in the same one.

h

Continuous operation = 8760 h (365 × 24). Lower it if it isn't 24/7.

kg/kWh

Grid carbon intensity. Chile's grid ≈ 0.4 kg CO₂/kWh.

Examples
redzilla.cl — pue 
 
  
 
 
Annual energy cost
 
—
 
—
 
 
 
Cooling overhead
 
—
 
energy above IT (PUE−1)
 
 
 
CO₂ emissions
 
—
 
per year
 
 
  
 
 Cost/yr —  
 
 Energy —  
 
 DCiE —  
 
 CO₂ —  
 
  
 
Calculation breakdown
 
 
  
ItemValueNote
   
 
 
 
 How it's computed · PUE, DCiE and CO₂ 
 
 1. Annual IT energy:
E_IT = P_IT × hours (kW × h = kWh).

 
 2. Total facility energy:
E_total = E_IT × PUE. PUE covers cooling, UPS,
            distribution and lighting.

 
 3. Annual cost:
Cost = E_total × tariff.

 
 4. Cooling and infrastructure overhead:
= (PUE − 1) × E_IT × tariff. It's what you pay on top of the IT energy.

 
 5. Efficiency:
DCiE = 1 ÷ PUE (as %). Emissions:
CO₂ = E_total × factor.

 
 ! Simplified model: assumes constant IT power
            and an average PUE. Real PUE varies with load and climate, and grid
            intensity changes hour by hour.

 
 
 
 
 
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