WordNet sense 1 (a company that performs a public service; subject to government regulation):

public-service corporation, public utility, public utility company

WordNet sense 2 ((computer science) a program designed for general support of the processes of a computer):

utility program, service program

WordNet sense 3 (the quality of being of practical use):

usefulness

WordNet sense 4 (used of beef; usable but inferior):

utility-grade

WordNet sense 5 (of low or inferior quality):

inferior

WordNet sense 6 (capable of substituting in any of several positions on a team):

substitute

WordNet sense 7 (being of second rank or importance or value; not direct or immediate):

secondary