post of Senior Clerk in DESU vide order dated 16.06.1981 w.e.f. 25.09.1974. Petitioner got his 2nd promotion to the post of Head Clerk on ad-hoc basis w.e.f. 17.02.1992 vide office order dated 29.01.1992. A charge-sheet was served on the Petitioner on 15.10.1992 and he retired from the service of DVB on the post of Head Clerk ( Ad-hoc ) on 31.03.1996. 6. It is averred in the writ petition that from 01.04.1996, Petitioner was drawing his pension as Head Clerk but pursuant to a penalty imposed on 21.01.1998 in the disciplinary proceedings there was a cut of 20% in his monthly pension for 2 years. Post the retirement of the Petitioner, DVB issued an order providing for grant of 3rd TBP for those employees who had completed 26 years of service and had not got 3rd promotion. On 29.07.2011, Sh. Madan Lal Sharma, who was junior to the Petitioner and was appointed as Head Clerk on ad-hoc basis was given 3rd TBP Scale to the next higher post of Superintendent (Clerical). 7. Common contentions of the Petitioners are that on completion of 26 years of service from the respective dates of their induction, they ought to have been given 3rd TBP Scales as both had not earned 3rd promotion in the normal course and had completed 26 years of service on the dates from which they seek the said scale. The argument is that Regulations 1995 were notified by DESU on 30.03.1995 which provided that service means regular service in the cadre including ad-hoc service and after the enactment of Delhi Electricity Reforms Act, 2000 (‘2000 Act’), vide notification dated 26.06.2002, DVB was unbundled into 6 companies, i.e. one holding company (Delhi Power Company Limited), one generation company (IPGCL) and 3 distribution companies (BSES-YPL, BSES-RPL and Tata Power Delhi Distribution Limited). Employees of erstwhile DVB were