ratepayer
noun /ˈreɪtpeɪə(r)/
  /ˈreɪtpeɪər/
- (in the UK in the past) a person who paid taxes to the local authority on the buildings and land they owned
 - (in the US) a person who pays for services like electricity, gas, water, etc. to be provided for their home 
- Utility regulators are not doing enough to protect ratepayers from possible unfair hikes to gas and electric bills.