Discussion
A power station emits \( 21 \) tonnes of nitrogen oxides a day and generates \( 4800 \) MWh. The emission rate per unit generated is
Answer: B
Correct answer: 4.375 kg per MWh
Divide the emission by the output, converting tonnes to kilograms:
\[ \frac{21\,000\ \mathrm{kg}}{4800\ \mathrm{MWh}} = 4.375\ \mathrm{kg\ per\ MWh} \]
Normalising emissions to output rather than reporting them as an absolute rate allows plants of different size and utilisation to be compared, and it is the form in which emission performance standards are usually written. It also separates two distinct routes to lower emissions: cleaner combustion, and simply generating more efficiently.
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