Could you please name the technology? I work with renewable energy and I have no idea.
Are you talking about nuclear?
Are you talking about nuclear?
Some estimate we're currently only at Kardashev 0.8, harnessing about 80% of what energy from the Sun hits the Earth, while others argue that this percentage is much lower.
Ideas are easy, implementation is hard.
Edit for clarity.
80% seems super high, unless by 'harnessing' you also mean things like 'the sun energy warms up the ocean allowing fish to live which we then consume for some% of the energy that sun sent'.
I'd be pretty surprised if efficiently used energy / energy hitting the earth from the sun was >20%.
The numbers I'm seeing are 174 petawatts hits Earth and the world uses 18 terawatts of energy.