How to classify supraplanetary civilizations

By energy consumption:

In a seminal paper published in 1964 in the Journal of Soviet Astronomy, Russian astrophysicist Nicolai Kardashev theorised that advanced civilisations must thus be grouped according to three Types: I, II and III, signifying mastery of, respectively, planetary, stellar and galactic forms of energy usage. He calculated that the energy consumption of these three types of civilisations would be separated by a factor of about 10 billion.