Collocations for capacity - noun

high, large
a high-capacity electric pump
large-capacity disk drives

limited, small
maximum, total
a total capacity of 10 gallons

additional, excess, spare
excess capacity in the oil industry

carrying, production, seating, storage
nuclear
lung
engine, fuel
disk, memory
economic, productive
earning
The qualification should increase my earning capacity.

have
expand, increase
reduce

audience, crowd

at capacity
The system was already at capacity.

be filled to capacity, be packed to capacity
The stadium was filled to capacity (= was full).

operate at full capacity, work at full capacity (= to produce the maximum amount possible)

amazing, enormous, great, infinite, remarkable
limited
innate, natural
Children have an innate capacity to understand language.

intellectual, mental
human
the human capacity for compassion

demonstrate, have, possess
develop
lack, lose
She seems to have lost the capacity to enjoy herself.

enhance, increase
reduce, restrict

beyond sb's capacity
These questions are beyond the capacity of most students.

within sb's capacity
The mountain walk is well within the capacity of most fit people.

capacity for
her amazing capacity for organization

official
personal, private, unofficial (esp. BrE)
professional
voluntary (esp. BrE)
acting, caretaker (BrE)
advisory
judicial (esp. BrE)

act in, work in
I have worked in an advisory capacity with many hospitals.

in your capacity
In my capacity as president, I would like to thank Jack for his hard work.