PENNSYLVANIA ENTERPRISES <PENT.O> BID STANDS Utilities Investment Inc said it still is offering to acquire Pennsylvania Enterprises Inc for 55 dlrs per share. It said it is prepared to negotiate its offer. The Pennsylvania Enterprises board rejected the offer two weeks ago as being inadequate. Utilities said it has the financial commitments required to ensure that Pennsylvania Enterprises' facilities would be upgraded to insure an adequate supply of safe drinking water. It said its representatives will be attending Pennsylvania Enterprises' annual meeting tomorrow in Wilkes-Barre, Pa.