Reg.No. 5 of 1999: The Advocate–on-record for the APERC in Supreme Court	Principal Regulation
Reg.No. 3 of 1999: Method of Recruitment and Conditions of Services of Officers and Staff	Principal Regulation 1st Amndt. through Principal Reg 3 of 1999 Supplementary Reg. 5 of 2013
Conduct of Business Regulation No. 2 of 1999	Principal Regulation 1st Amndt. through Reg.No. 8 of 2000 2nd Amndt. through Reg. 1 of 2003 3rd Amndt. through Reg. 2 of 2013 4th Amndt. Reg. No. 2 of 1999 5th Amdnt. through Reg. No. 6 of 2019