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# Energy from Coal

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Equation / Last modified by KurtHeckman on 2018/04/12 14:53
`E_c = `

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KurtHeckman.Energy from Coal

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The **Energy from Coal** calculator computes the amount of electrical energy produced by an amount of coal (Mc), the specific energy of coal and an efficiency factor.

**INSTRUCTIONS**: Choose units and enter the following:

- (
**Mc**) This is the amount of coal - (
**ef**) This is the efficiency of coal energy conversion.

**Energy from Coal (E _{c}):** The calculator returns the energy in kiloWatt-hours. However, this can be automatically converted to compatible units via the pull-down menu.

#### The Math / Science

The specific energy of coal is 25 Mj/kg. The formula for the Energy from Coal is:

Ec = Mc • SEc • ef

where:

- Ec is the energy from coal
- Mc is the amount (mass) of coal
- SEc is the specific energy of coal (25 Mj/kg)
- ef is the efficiency of conversion factor

**Note**: a modern power station has an efficiency of about 30%.

**Scientific Attribution**: Special thanks to William Burt (Energy consultant and Project Engineer) for his Energy in Coal answer on Quora that is the basis of this calculator.