Homo Early Pleistocene (1.2 Mio. before current)
Parent universe:
Reality
(Generated image, may be not scientifically correct)
Kardashev
Value: 0.057
Min: 0.04
Max: 0.25
Confidence: CalculatedGuess
At a 3000 kcal per day diet.
That makes 130 W.
Plus 70 W for open fires, cooking, etc. to make a round 200 W figure.
Disregarding sunlight as always.
At how much power does a camp fire run? Also camp fire may have a 1% efficiency.
Do we count the useful warmth as "energy use" or do we include 99% waste heat?
If the population were in the millions instead of in the 10.000s then we are easily at K 0.4 just by warm bodies.
Population
Value: 18500
Min: 10000
Max: 26000
Confidence: Canon
References:
# Reason
By taking the first source that comes up
Homo habilis and/or Homo erectus (you tell me if you want to have it exactly)