at network</dd>
<dt>no</dt><dd><p>
the candidate is not part of a network, nor has it been given an individual system.
</p>

<p>
For buildings, this can happen if (a) the objective is network NPV or (b) the objective is whole-system NPV but no individual system is on offer because (i) individual systems are not enabled, or (ii) they are enabled but this building has no counterfactual or alternative heating choices set.
</p>

<p>
For paths this just means they are not in a network
</p></dd>
<dt>impossible</d