Ways to unlimited energy resources

1. Renewable resources

1.1. Wind power

1.2. Geothermal energy

1.2.1. Material science

1.3. Hydropower

1.4. Solar plants

2. Asteroid mining

3. Nuclear energy

3.1. Fusion

3.2. Fission

3.2.1. Robotics

4. Space exploration

4.1. Infrastructure

4.1.1. Dyson sphere

4.2. Nuclear propulsion

4.2.1. Nuclear thermal rocket

4.2.2. Ion propulsion system

4.2.2.1. Interstellar travel