(a) A governmental entity is liable for damages resulting from bodily injury, wrongful death or property damage caused by the negligence of public employees while acting within the scope of their duties in the operation of public utilities and services including gas, electricity, water, solid or liquid waste collection or disposal, heating and ground transportation.
(b) The liability imposed pursuant to subsection (a) of this section does not include liability for damages resulting from bodily injury, wrongful death or property damage caused by a failure to provide an adequate supply of gas, water, electricity or services as described in subsection (a) of this section.