As per your need, I am giving you list of private and government companies for which you can apply after doing B.Tech in Electrical and electronics engineering.

Government companies

APGENCO
APTRANSCO
BHEL
NFC
ECIL
APSPDCL
NTPC
ETDC
DRDO
ISRO
ONGC
SAIL
GAIL

Private companies

Aqua Brand Submersible Sewage Pump
Compact
Crown Electric Company
MMC Electric Company
MS Enterprises and Trimega Power Corporation
National Electrical Industries - Ahmedabad.
Numeric Power Systems
Shanti Enterprises Electricals Limited
Shashi Electricals
SK Systems
Tata Consulting Engineers
Nutronics India
Vxl Technologies Ltd.
XtremeWorx
Eveready Industries India Ltd
Indexelectronics
Khaitan Group
Asiatic Electronic Industries.
Axis Electrical Components India Pvt. Ltd.
Balar Marketing Pvt. Ltd
Bhartia Industries Limited
Brass Copper & Alloy (I) Ltd.
Finetech Engineering Corporation
Gayatri Control, Ahmedabad
Gemscab Industries Ltd
Hallmark Electronics
India International House Ltd
Jaykrishna magnetics pvt.ltd
Leotech Group
Maxx Mobile Phone Accessories Pvt. Ltd
Vijaya Electricals
Sony
Godrej
Amaron