Guides from Kardashev II

Longer, plain-language pages on the questions this site exists to answer.

How to read world energy numbers World energy reports mix exajoules, watts, electricity, and fuels. Here is how to read a yearly total without mixing those up.
How we measure civilizations The Kardashev scale is a score for energy use, not a moral grade. Here is how the measurement works, and what it leaves out.
Solar capacity and the electricity mix Solar panels passed three terawatts of capacity in early 2026 and supply about 9% of world electricity. Here is what those figures mean, and what they do not.
What fusion gain means Fusion "gain" compares energy out of a fuel capsule with energy delivered to it. It is a real milestone, and it is not a power station.
Why reaching orbit still matters A 2018 NASA paper put SpaceX's Falcon 9 at $2,720 per kilogram to low Earth orbit. Cheap access to space is still a missing piece of any star-scale plan.