 is multiplied with the system's output and losses each year to determine the cost of heat that was produced.
</p>

<p>
If you have a fuel cost A and a nominal efficiency B this should probably be A/B
</p></dd>
<dt>Emissions factors</dt><dd>These determine the emissions the supply is responsible for, per unit of heat output. Similarly to fuel cost, you will probably need to incorporate an efficiency into these values.</dd>
</dl>
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