There are concerns about impact on power grid by the act of public as above.
A clarification with suggestions is released as per news item below assuring about preparedness.
https://m.timesofindia.com/india/pm-modis-blackout-appeal-no-need-to-switch-off-appliances-at-home-clarifies-centre/articleshow/74982311.cms
It is mentioned that lights in essential service buildings, street lights, power consuming appliances in houses like computers, air conditioning, refrigerators, etc can be ON and the appeal is only for lights in the houses. The appeal is also for maintaining social distance during this and other times.