The story
The erstwhile Maharashtra State Electricity Board (MSEB) was looking after the generation, transmission & distribution of electricity in the state of Maharashtra. With the enactment of the Electricity Act 2003 of the Government of India, MSEB was unbundled into four companies on 6 June 2005 viz.
MSEB Holding Company Limited
Mahanirmiti (महानिर्मिती) or Mahagenco (Maharashtra State Power Generation Company Limited (MSPGCL))
Mahapareshan (महापारेषण) or Mahatransco (Maharashtra State Electricity Transmission Company Limited (MSETCL))
Mahavitaran (महावितरण) or Mahadiscom (Maharashtra State Electricity Distribution Company Limited (MSEDCL))
Of these, Mahavitaran is responsible for the distribution of electricity throughout the state by buying power from either MahaGenco, Captive Power Plants, or from other State Electricity Boards and Private sector power generation companies. The 'MSEB Holding Company' was created to hold all the stakes in these three companies.
From Wikipedia’s article on Maharashtra State Electricity Distribution Company Limited, shared under CC BY-SA 4.0.4