Have a go at listing them.
asked
GrahamO
Just for the purposes of debate I'll try... these are front of house things. (There are probably more behind the scenes - but what do I know... ? That's why we have clever BMS systems - they can decide what is / is not really needed - dynamically.)
1.Probably 1/2 the general lighting load could go without greatly affecting most folks. 100% in un-used boarding lounges, corridors etc.
2.Heating / Cooling can be shut down for quite a time before anyone notices - as long as some ventilation/air movement is maintained. The terminal will have huge thermal inertia.
3. Retail outlets - I'd shut 'em permanently if I had my way.
4. Stop escalators and moving pavements - most folk can walk. Leave lifts for those who can't. Anyway if there are no flights who needs to get anywhere?
I grant you after 2/3 hours of waiting people are going to want some food & bev. But it needn't be cooked to order. Dish out water, cold drinks and snax.
2. above is probably the single biggest load but if it comes from a central plant elsewhere in the airport, which is unaffected by the power outage, it may even be possible to keep it on. The fan load is not too significant