Zettascale Computing - Computing systems capable of calculating at least "1021 IEEE 754 Double Precision (64-bit) operations per second (zettaFLOPS)
In 2018, Chinese scientists predicted that the first zettascale system will be assembled in 2035.[5] This forecast looks plausible from the historical point of view as it took some 12 years to progress from the terascale machines (1012) to petascale systems (1015) and then 14 more years to move to exascale computers (1018). A Zettascale Computer Today Would Need 21 Nuclear Power Plants