Employee was walking between electrical cabinets in the MCC room when they stepped on a elec cover ground plate and it gave way 8-10 inches. EE fell to one knee hitting hard hat on the floor. EE called a supervisor and they filled out a near miss report. Hours later EE started to feel some discomfort. EE went to the Doc on 2/26 and was given 6-7 visits with physical therapist.