- The Company was Incorporated on 18th November. A formation agreement was signed on 18th November between Government of India, National Iranian Oil Company (NIOC) Iran & Amoco India Inc. USA for setting up Madras Refineries Ltd.

- With the commissioning of cauvery basis refinery, capacity was enhanced to 7 million TPA and with this the company became multilocational.

1991

- An agreement for supply of Anti-oxidants Feedstock to Balmer Lawrie & Co. Ltd. Chennai was signed in September and the first supply was successfully effected in March 1992.

- The Government of India has given approval to MRL in July for setting up Gas Sweetining and LPG Separation facilities at Nagapattinam.

1992

- MRL signed, for the second consecutive year, a Memoraandum of Understanding (MoU) with Goverment of Inida for the year 1991-92.

- During the year, the Company crossed 1.2 million accident free employee manhours which was accrued in 172 continous working days.

- In collaboration with Anna University, MRL has prepared a curriculum on "Safety and Hazards Control in Petroleum Industry" for the Post-Graduate Course in Petroleum Refining.

- The Hexane Plant with a prodction capactiy of 25,000 Metric Tonnes per annum has been commissioned.

- A Sewage Water Treatment Plant with capacity of 2.5 MGD has been commissioned

- As a part of pollution control measure, the effluent treatment plants were modernised to treat the effluents of the refinery for meeting the Minimum National Standards (MINAS).

- The old refinery instrumentation control has been modenised. This includes ON-Link Tank Level Information System, the first of its kind in India.

- The Company proposes to take up a revamp programme and install the hydro-finishing unit.

- MRL has developed gardens and traffic islands which have received prizes in various competitions. It is proposed to have a green belt around the new Cauvery Basin refinery site at Panagudi, near Nagapattinam.

- The Company entered into a long term wage settlement with the non-supervisory employees of the Company represented by Chennai Refinerires Employees Union valid for four years effective 1st January 1990.

1993

- As per the meeting held on 11th November, a separate offer of 53,83,000 shares aggregating Rs 4306,40,000 to NIOC at Rs 80 per share was made.

- The Company proposed to set up a 350 MW power project in joint venture at a Manali by utilising available refinery residue as fuel.

- 1141,31,100 No. of equity shares issued subscribed and paid up. During 1994, the Company issued 266,55,300 No. of equity shares at a premium of Rs 70 as follows (i) Firm allotment basis 59,23,400 shares to Mutual Funds; (ii) 59,23,400 shares to Indian fin. Insts; (iii) 29,61,700 shares to Foreign Fin. Insts; (iv) The balance were issued on preferential basis. (a) 41,46,300 shares to NRIs; (b) 3,40,000 shares to employees. Balance 103,22,200 shares to public.

1995

- A new boiler for co-generation of 130 T/HR capacity to meet the increased stream load was commissioned.

- The Company proposed to undertake continuous catalytic reformer project to meet zero lead and other changed specification of petrol introduced by Government of India. Also studies were underway for the setting up of a 250 MW power project at Manali in collaboration with CEA India Inc. of USA.

- The Company proposed to set up a 3 million tpa project at Manali at a cost of Rs 1700 crores. 1996

- The Company commissioned the LPG separation unit & steam turbo generator was commissioned at CBR.

- The Company obtained the first stage clearance from Government of India to expand its refining capacity at Manila by another 3 MMTPA thereby making the refining capacity of the company to 10 MMTPA.

- With the view to augment crude availability for the CBR, it was proposed to install crude receipt facilities at Nagapattinam for improving crude upto 1.0 MMTPA per annum.

1997

- In the field of LOBS, the Company launched 500N grade of LOBS based on customer's demand.

- The project to increase the existing wax deoiling unit plant capacity from 20,000 tpa to 30,000 tpa at a cost of Rs 41.32 crores was commissioned.

- The company offered 53,83,000 equity shares of Rs. 10 each at a premium of Rs. 70 per share on private placement basis pursuant to an agreement between the Government of India and M/s National Iranian Oil Company (NIOC).

- The Company obtained clearance from the Govt. to expand the capacity at Manali by another 3 million tonnes per annum.

- The Company's R&D sponsored a project on `Production of tube stocks from Waxy Crudes' at NCL Pune.

- The company sponsored a project at Indian Institute of Petroleum for cube character solution and additive response studies.

- The centre in collaboration with EIL and Indian Institute of Petroleum developed a process package for NMP - Lube Extraction Technology.

- As a part of indigenisation of reverse osmosis membranes in collaboration with Central salt and marine chemicals research institute the R&D unit commissioned a reverse osmosis pilot plant of 50,000 litres per day capacity to study the membrane performance.

- MRL was formed as a joint venture between the Government of India (GOI), Amco India Inc. USA & National Iranian Oil Company (NIOC), Tehran, Iran with initial equity contribution in the ratio of 74:13:13.

- The Company offered 53,83,000 No. of equity shares of Rs 10 each at a premium of Rs 70 per share on private placement basis pursuant to an agreement between the Government of India and M/s National Iranian Oil Company.

- The Company received a sum of Rs 2786,00,000 from NIOC and accordingly 34,82,500 No. of equity shares were allotted to NIOC. The balance of 19,00,500 shares were to be allotted on receipt of balance amount.

- Madras refineries Ltd has signed a memorandum of understanding with the Ministry of Petroleum and Natural Gas for 1997-98.

- The joint sector Southern Petrochemical Industries Corporation Ltd (SPIC) has proposed to go along with the State-owned Madras Refineries Ltd (MRL) to implement the PFY project in Tamil Nadu.

- Around 800 workers of Madras Refineries Limited went on a tool-down strike following a call by the executive committee of the Madras Refineries Employees Union (MREU).

- The company had suspended the general secretary and the joint secretary (Manali unit) of the union following an incident during negotiations with the management, when the two poured kerosene on themselves and threatened to commit self-immolation if the management did not concede their demands.

- Another joint venture is also considered between Petronas, IOC and MRL for setting up an underground cavern storage facility at the Ennore liquefied natural gas import station.

- CARE has assigned a PR+ rating to the CP programme of Rs 25 crore of Madras Refineries Ltd and has retained in PR1 + rating assigned to the intercorporate borrowing of Rs 125 crore.

1998

- The company proposed to set up a permanent jetty facility to make available the required quantiuty of crude at Cauvery basin, Nagapattinam.

- The company signed a MOU with Indian Oil Corporation Ltd to work jointly on projects of mutual benefit including a refinery project in Southern India, identify various projects fore collaboration including pursuance of techno-economic Feasibility reports and on estabhlishing the Techno-economic viability of identified projects from joint venture companies to implement the same.

- Madras Refineries Ltd (MRL) has signed a memorandum of understanding (MoU) on May 22 with the Union Government for 1998-99.

- Madras Refineries Ltd (MRL) has opted for 20 per cent equity in the roughly 350 km-long Chennai-Trichy-Madurai product pipeline, being set up by Petronet India Limited.

1999

- The Tamil Nadu Electricity Board signed a power purchase agreement with Madras Refineries Ltd.

- Madras Refineries Ltd has reached an agreement with two SPIC group companies - Manali Petrochemicals Ltd (MPL) and SPIC Organics Ltd (SORL) - under which the two companies would withdraw their cases against MRL relating to a dispute over pricing of propylene.

- The company has signed a tripartite agreement with CDSL and Karvy Consultants Ltd, share transfer agent of the company, for the purpose of admission of equity shares of the company to the depository system of CDSL.

2000

- Indian Additives Ltd. a joint venture of the company, and Chevron Chemical Company US, has ceased to be a subsidiary of the company.

- The Company has changed its name to Chennai Petroleum Corporation Ltd. (CPCL) with effect from 6th April.

- The Company has signed a MoU with Indian Institute of Safety and Environment, Chennai to conduct Safety courses.

- The Company has shut its 70,000-barrel-per-day No. 1 crude distillation unit to correct a technical fault.

- The Symbol of the company shall be changed from MADRASREFN to CHENNPETRO effective from August 9.

- The company is expanding the capacity of its Cauvery Basin Refinry at Panangudi near Nagapattinam to one million tonne from the current 0.5 million tonne.

- Chennai Petroleum Corporation Ltd. (CPCL) was given the award for "the Best Employer-Employee Relationship" by the Rotary Club of Chennai.

- The Chennai Petroleum Corporation Ltd. has launched crumb rubber modified bitumen for laying high quality and cost effective roads.

2001

- The Chennai Corporation and EDL India Pvt. Ltd. entered into an MoU, to set up a 14.85 MW waste-to-energy project using municipal solid waste.

- There was a fire in the FCC unit of the Manali refinery on February 20. The fire was completely put out within 50 minutes and the unit was shut down.

- Chennai Petroleum Corporation Ltd. has signed an MoU with the Union Ministry of Petroleum and Natural Gas for 2001-02.

2002

- Chennai Petroleum Corporation Ltd has informed that Mr L Sabaretnam, CEO of ICL Sugars Ltd has been appointed as a Part-time Non-Official Independent Director on the Board of the company.

-Gowrishankar ceases to be a Director of Chennai Petroleum Corporation.

-Chennai Petroleum Corporation Ltd has informed that Mohit Sinha ceased to be a Director on the Board of the company.

-Chennai Petroleum Corporation Ltd has informed BSE that Mr M B L Agarwal, Executive Director (Internal Audit), Indian Oil Corporation Ltd ceased to be a Director on the Board of Chennai Petroleum Corporation Ltd (CPCL) effective August 01, 2002. In his place, Mr T L Jain, Executive Director (Southern Region) Indian Oil Corporation Ltd, has been appointed as a part time Director on the Board of CPCL.

-Chennai Petroleum Corporation Ltd has informed BSE that pursuant to letter from the Ministry of Petroleum and Natural Gas, Government of India, Mr S V Narasimhan, Director (Finance) Chennai Petroleum Corporation Ltd has assumed additional charge of the post of Managing Director, CPCL effective October 01, 2002 consequent to the superannuation of Mr S Rammohan Chairman and Managing Director of the Company.

-Chennai Petroleum Corporation Ltd has informed BSE that Mr M S Ramachandran, Chairman, Indian Oil Corporation Ltd and Mr A K Arora Director (Refineries), IOCL have been appointed as part time Directors on the Board of CPCL effective October 01, 2002.

-S V Narasimhan appointed as MD of Chennai Petro.

-2003

- Chennai Petroleum Corporation Ltd has informed BSE that Mr R Sankaran, General Manager (Projects & Development) of the Company has assumed charge of the post of Director (Technical) of the Company with effect from January 01, 2003 in place of Mr M P Srinivasan who has superannuated on December 31, 2002.

-Chennai Petroleum Corporation Ltd has announced following changes in its Board:

Mr P S Rao, Executive Director, Indian Oil Corporation Ltd has been appointed as part time director on the board of CPCL in place of Mr A K Mishra effective June 1, 2003.

Mr Chandan Dasgupta, Executive Director, Indian Oil Corporation Ltd has been appointed as a part time director on the Board of CPCL in place of Mr T L Jain effective june 1, 2003.

-Chennai Petroleum Corporation has informed BSE that the company has set up a Crude Oil Jetty Facility within the ports of Nagapatnam at the cost of Rs960 million to meet crude oil requirements of Cauvery basin Refinery.

-Mr.Jaspal Singh,Director (Indian Oil Corporation) and Prabha Das have been appointed as the part time Directors on the Board of CPCL.

-Mr.Mahmood Vaezi of International Policy, Centre for Strategic Research,Naftrian Intertrade Company Ltd, Tehran, Iran has been nominated as the Director on the Board of the company.

-Mr.K.Skandan, Secretary to Government of TamilNadu, Industries Department has been appointedas part time Independent Director on theBoard of CPCL.

-Mr. K Skandan, IAS, ceased to be a Director

-The Chennai Port Trust has signed an agreement with various oil companies, including Chennai Petroleum Corporation Ltd (CPCL), to set up a Tier I Oil Spill Response facility at the Chennai port.

2004

-Chennai Petroleum Corporation Limited has informed that equity shares of the company have been delisted from The Stock Exchange - Ahmedabad wef January 19, 2004.

1. Mr. N.C. Sridharan, General Manager (Finance) will hold additional charge of the post of Director (Finance) w.e.f. January 20, 2004 for a period of three months or until further order, whichever is earlier, in addition to his own duties, as communicated by the Ministry of Petroleum and Natural Gas vide letter dated January 12, 2004.

2. Mr. R. Sankaran, Director (Technical) will hold additional charge of the post of Director (Operations) w.e.f. February 1, 2004 for a period of six months or until further order, whichever is earlier, in addition to his own duties, as communicated by the Ministry of Petroleum and Natural Gas vide letter dated January 12, 2004.

-Chennai Petroleum Corporation Ltd has informed that its equity shares have been delisted from the Delhi Stock Exchange Ltd (DSE) w.e.f. February 19, 2004.

-Chennai Petroleum Corporation Ltd has informed that Mr A Kasturi Rangan Executive Director (Operations), Chennai Petroleum Corporation Ltd has been appointed as Director (Operations), Chennai Petroleum Corporation Ltd

2005

-Equity shares of the company have been delsited from The Calcutta Stock Exchange Association Limited w.e.f December 09,2004.

-IOC inks pact with CPCL to provide project consultancy on crude pipeline

2006

-CPCL to acquire stake in SPV for Chennai-Bangalore pipeline project

-Jawaharlal Nehru Centenary Award for Energy Performance 2007 -CBR won the Star award from National Safety Council of India, Tamil Nadu Chapter, Chennai for the year 2007 under the NSCI Safety awards Scheme of NSC, TN Chapter, chennai. -State Safety Award for 2005 2008

-CPCL received Exim Achievements Award from Tamil Chamber of Commerce at a Function Presided by His Excellency the Governor of Tamil Nadu. -CPCL received Golden Peacock Award for its Pioneering efforts in the field of occupational Health in the Oil sector and for the Most significant improvements & innovative activities practiced in the field of Occupational Health & Safety.

2009 -CPCL received Golden Peacock Award for its Pioneering efforts in the field of occupational Health in the Oil sector and for the Most significant improvements & innovative activities practiced in the field of Occupational Health & Safety.

- Chennai Petroleum Corporation Ltd (CPCL) has appointed Mr. K. Balachandran as the Managing Director effective December 01, 2009.

-Rural Development and Panchayat Raj Department, Government of Tamil Nadu has selected Chennai Petroleum Corporation Limited (CPCL) as one of the recipients of the prestigious Corporate Social Responsibility (CSR) Award for the year 2008-09 for having undertaken various social and economic upliftment programs within the State of Tamil Nadu. -CPCL has been selected for the Presentation of the prestigious 10th Annual "Greentech Environment Excellence Award-2009".

2010

-CPCL CBR was awarded "Award for TPM Excellence, category A" indicating that TPM is implemented for all the 8 pillars excellently in entire CBR by JAPAN Institute of Plant Maintenance(JIPM) during January 28, 2010.

2011 -Mobile Ambient Air Monitoring Unit of Chennai Petroleum Corporation Limited (CPCL) launched.

-Mr.T.S.Ramachandran has been appointed as the Director (Technical) of Chennai Petroleum Corporation Limited (CPCL).

-Ms.D.Lilly has been appointed as the Director (Finance) of Chennai Petroleum Corporation Limited (CPCL)

2012

-Mr. K. Suryanarayanan, Cost and Management Accountant, Chennai has been appointed as Cost Auditor of the Company for the financial year 2012-13.

-Mr. A. S. Basu, Executive Director, Indian Oil Corporation Limited has been appointed as Managing Director, Chennai Petroleum Corporation Limited.

2013 -Chennai Petroleum Corporation Ltd has informed that Mr. P. Shankar, Deputy Secretary has been designated as Company Secretary will be the Compliance Officer of the Company. -Chennai Petroleum Corporation Ltd has informed that Mr. Mohan Lal, Deputy Secretary (R&A), Ministry of Petroleum & Natural Gas has been appointed as a Director on the Board of CPCL

2014 -Chennai Petroleum Corporation Ltd has informed that Mr. Sanjiv Singh, Director (Refineries), Indian Oil Corporation Limited has been appointed as a Director on the Board of CPCL, vide resolution passed by the Board of Directors on July 03, 2014. -Chennai Petroleum Corporation Ltd has informed that Shri. Gautham Roy, Executive Director, Indian Oil Corporation Limited has been appointed as Managing Director, Chennai Petroleum Corporation Limited in terms of letter dated October 09, 2014

2015 - CPCL received 3rd Governance Now PSU Award 2015

2016 -CPCL was awarded the "Top Export- Southern Region Export Excellence Award (Silver)" for the year 2015 - 16. -CPCL was awarded the "Highest Tax payer Award 2015-16 by Central Excise Department.

2017 -CPCL was awarded the "Top Export- Southern Region Export Excellence Award (Gold)" for the year 2016 - 17.

2018 -CPCL gets nod for taking up Nagapattinam refinery expansion.

2019 -Rotary Club of Chennai Towers has conferred the "Excellence in CSR" Award on CPCL.

2020 -CPCL received the Golden Peacock Award for Corporate Social Responsibility (GPACSR) for the year 2019. -CPCL had been conferred with an award for "Best Practices in CSR Awards 2020" under the category Rural Development.

2021 -CPCL Conferred with Centre for Excellence in Project Management (CEPM) Fellowship Award , in recognition of his par excellence in team building and in managing complex project. -CPCL was conferred with an award under the category "Usage of Secondary Treated Water for Industrial Use for the year 2021" during Virtual Water Conclave & Awards 2021 organised by FICCI.

2022 -CPCL has received the Prestigious "Mahatma Award 2022 for CSR Excellence". -Chennai Petroleum Corporation Limited (CPCL) received the prestigious Golden Peacock Innovative Product Award for the year 2022.