Today I saw in the paper a new (to me) word for it: 'power holiday.'
The government's explanation is interesting. According to The Hindu:
The revised system of intensive load shedding... has been designed to ensure that there are no unscheduled disruptions in power supply.i.e., we're having scheduled outtages (I think this word is also local?) so that we don't have unscheduled outtages. Further,
... the main cause for the frequent interruptions in the supply is the under-frequency relay factor...inadequate capacity addition... poor rainfall ... substantial reduction in the State’s share of power from Central Generating Stations that are hit by the shortage of lignite and uranium... [and] ... sudden loss of wind energy...
Opposition leader, Jayalalitha's response to this was succinct: she was quoted as saying that the reasons cited by the government for power shortage are "strange and ridiculous."