Voltage: 230V / 50Hz — the same as Europe and Australia. American and Japanese devices (110V/60Hz) require a voltage converter unless they auto-switch (check the label for '100–240V' to confirm).
Plug types: India primarily uses Type C (two round pins) and Type D (three large round pins in a triangular arrangement). Many modern hotels also have Type G (UK-style) and universal sockets built in. Carry a universal travel adapter as a safeguard in older budget guesthouses.
Power cuts: Brief load shedding can occur in residential areas, though all hotels maintain backup generators. Carry a portable power bank for long sightseeing days when charging opportunities are limited.
USB charging: Available on newer Delhi Metro rolling stock and in most mid-range to upscale hotel rooms. Airport lounges and major railway station waiting areas also have USB points.