as i know, the main drive is from fusion or fission (nuclear) reaction. these reactions produce high energy and heat. i think the Physicist could better to explains this.

Dr Luhut Siringoringo thank you for your contribution to the discussion

Yes, energy is created by nuclear fusion that takes place in the sun. Fusion occurs when protons of hydrogen atoms violently collide in the sun's core and fuse to create a helium atom. This process, known as a PP (proton-proton) chain reaction, emits an enormous amount of energy. The Sun's energy is generated in its core and moves outward to its surface where it is released as electromagnetic radiation. The Sun's energy is generated by nuclear fusion occurring in its core. Here, protons of hydrogen atoms violently collide and fuse to create a helium atom. The sun is hot and bright because of a process called nuclear fusion. Nuclear fusion is when the sun's core (the center of the sun) smashes together tiny particles called atoms to make bigger particles. When this happens, a lot of heat and light is released. The Sun generates energy deep in its core through nuclear fusion that burns Hydrogen into heavier atoms. As the atoms merge, energy is released, and begins the long journey toward the Sun's surface. Along the journey, energy is transferred via two of the methods of heat transfer: convection and radiative transfer. The Sun's radiation strikes the Earth's surface, thus warming it. As the surface's temperature rises due to conduction, heat energy is released into the atmosphere, forming a bubble of air that is warmer than the surrounding air. This bubble of air rises into the atmosphere.The temperature in the Sun's core is about 27 million degrees Fahrenheit (15 million degrees Celsius) hot enough to sustain nuclear fusion. Solar radiation, or energy produced by the Sun, is the primary energy source for most processes in the Earth system and drives Earth's energy budget. The Sun is the primary energy source for our planet's energy budget and contributes to processes throughout Earth. Lithospheric plates are part of a planetary scale thermal convection system. The energy source for plate tectonics is Earth's internal heat while the forces moving the plates are the “ridge push” and “slab pull” gravity forces. Convection currents in the mantle are what cause the movement of tectonic plates. As the extremely hot molten material from the mantle rises toward the crust, it cools enough to become denser and sink back into the hotter area of the mantle. The motion in the outer core creates a magnetic field around Earth. It's the same field that makes a compass work! The core gives off incredible heat, which is one of the driving forces that cause the mantle to flow. The motion in the outer core creates a magnetic field around Earth. It's the same field that makes a compass work! The core gives off incredible heat, which is one of the driving forces that cause the mantle to flow. The Earth's outer core is in a state of turbulent convection as the result of radioactive heating and chemical differentiation. This sets up a process that is a bit like a naturally occurring electrical generator, where the convective kinetic energy is converted to electrical and magnetic energy.It is the heat dissipated from this extremely hot mantle that is acknowledged as the driving force behind the plate tectonics. This heat creates convection currents through the liquid and semi-liquid parts of the earth.