Navi Mumbai is supplied by Maharashtra State Electricity Distribution Company Limited (MSEDCL), which trades as Mahavitaran. This matters more here than almost anywhere in India, because the city across the creek is not on MSEDCL at all. Mumbai city is split between Adani Electricity, Tata Power and BEST, each with its own licence area, portal, forms and timelines. A page that tells a Vashi or Kharghar reader to apply to Adani Electricity has sent them to a utility that does not supply their meter.
The commercial terms come from the Maharashtra Electricity Regulatory Commission (MERC), not from the discom and not from us. Under the MERC Grid Interactive Rooftop Renewable Energy Generating Systems Regulations, 2019, your system capacity must not exceed the sanctioned load in kW or the contract demand in kVA of the premises. Every consumer category may apply, residential, commercial and industrial alike. Consumers may choose net metering or net billing. Applications are assessed against the spare capacity on your distribution transformer, and where a file is deficient the licensee must give you notice and a window to correct it rather than rejecting it outright.
Practically, that means your home or society draws solar first by day and exports the surplus to MSEDCL as credit, which offsets what you draw at night and through the monsoon dip.