Since many years, my TSSPDCL bills were auto-payed without my intervention through SBI netbanking, after onetime setup. When you have multiple bills to pay this is very convenient, and you'll get SMS prompts. You'll not get any cashbacks, but its a total no manual intervention payments. But since last month, SBI have upgraded their billing portal to SBI Unipay and its clumsy confusing, as I see TSSPDCL, but not able to pay there.
After the utility bill cashbacks started, I tried different apps, but, Airtel App and Tata Neu doesn't support TSSPDCL. As of now, only Amazon Pay looks better, but needs manually paying every month.
If there's any auto pay biller setup, please share here.