https://en.wikipedia.org/wiki/Kardashev_scale
Type I
A civilization "close to the level presently attained on Earth, with energy consumption at ≈4×1019
erg/sec" (4×1012 watts).
[2] A Type I civilization is usually defined as one that can harness all the energy that reaches its home planet from its parent star (for Earth, this value is around 2×1017 watts), which is about four
orders of magnitude higher than the amount presently attained on Earth, with energy consumption at ≈2×1013 watts as of 2020. The astronomer Guillermo A. Lemarchand defined Type I as a level near contemporary terrestrial civilization with an energy capability equivalent to the solar insolation on Earth, between 1016 and 1017 watts.
[3
]Type II
A civilization capable of harnessing the energy radiated by its own star—for example, by means of the successful completion of a
Dyson sphere or
Matrioshka brain—with energy consumption at ≈4×1033 erg/sec.
[2] Lemarchand defined civilizations of this type as being capable of using and channeling the entire radiation output of its star. The energy use would then be comparable to the luminosity of the
Sun, about 4×1033 erg/sec (4×1026
watts).
[3]
Type III
A civilization in possession of energy at the scale of its own
galaxy, with energy consumption at ≈4×1044 erg/sec.
[2] Lemarchand defined civilizations of this type as having access to power comparable to the luminosity of the entire
Milky Way galaxy, about 4×1044 erg/sec (4×1037 watts).
[3]
Kardashev believed that a Type 4 civilization was impossible, so he did not go past Type 3. However, new types (0, IV, V, VI) have been proposed.
