Modasa is UGVCL territory. Uttar Gujarat Vij Company Limited, one of the four state distribution companies under GUVNL, supplies the town and every taluka of Aravalli district. Locally the work runs through the UGVCL Modasa Division, whose office the Aravalli district administration lists near Meghraj-Malpur Charrasta on Shamlaji Road, Modasa 383315. The division sits under UGVCL's Himatnagar circle, and your own connection is held by one of its sub-division offices.
Geography trips up quotation writers here. Lunawada, Santrampur and the rest of Mahisagar district lie just south-east and belong to MGVCL. A Modasa proposal that names MGVCL, PGVCL, DGVCL or Torrent Power has been copied from somewhere else, and an application filed on it will land with the wrong company. Modasa is not inside any Torrent Power licence area.
The rules come from the Gujarat Electricity Regulatory Commission. Your solar capacity may not exceed your sanctioned load, residential, commercial, industrial and agricultural consumers can all apply, and units exported are set against units imported in the billing cycle. How any leftover credit is settled follows the GERC order in force on your commissioning date.