Is ArcGIS online Feature Layer an acceptable format? I found hundreds of utility line layers by searching for "utility line" here. For example:
Utility Line by Land Information Ontario
Identifies utility lines in Ontario.
Electric Transmission Lines - California Energy Commission [ds1198] by
The California Energy Commission (CEC) Electric Transmission Line geospatial data layer has been created to display the electric transmission grid in California. When used in association with the CEC Power Plant and CEC Electric Substation geospatial data layers, viewers can analyze the geographic relationships with the electric transmision grids across utilities, counties and state.The transmission line data, as one of the CEC''s critical infrastructure spatial data will be used to: 1. Support the CEC/STEP/Strategic Transmission Planning and Corridor Designation Office in corrdior study and transmission line siting; 2. Support the CEC staffs various analysis by providing general geographic reference information; 3. Enhance communication between and among government agencies on emergecy management, resource management, economic development, and environmental study;4. Provide illustration of critical infrastructure spatial data to the public or other agencies in hardcopy format.
Sewer Utility Lines - City of Chilliwack by andrewboan
Linear pipes representing lateral connections from property boundary to sewer pipes in the sewer network. Properties boundary to structure can be residential, commercial or industrial. Linear features represent gravity mains, force mains, siphons, stubs and service connections in the sanitary network.
This is just a few examples; there are hundreds more.
Some layers have detailed attribute data, and others don't.
You don't need an ArcGIS license to view these layers online. I haven't tested any further, but it looks like you can load them into a GIS program via the REST service URL. I'm not sure if you can download the data or if you can only use it through the REST service. There is a Geoprocessing Tool called Download ArcGIS Online Feature or AGS Feature/Map Service, which I would guess you need ArcGIS to use.