Well, there are actually several ways to generate power for portable stations, and I particularly like to discuss innovative approaches such as thermoelectric generators and hydrokinetic generators.
Thermoelectric generators make use of temperature differences to generate electricity. For instance, you can utilize the difference in temperature gradient between a cold and hot source and generate power through it.
Hydrokinetic generators make use of something similar to wind turbines to harness energy from flowing water and convert it to electricity to charge your portable power station.
If you are looking for something a little more exciting, then you can check hand-crank generators, where you manually generate electricity by turning the crank.
For a regular yet exciting option, you can turn to a reliable device like the Anker Solix F2000 — previously known as "Anker PowerHouse 767" — which can still give you everything you need.