Moving towards a planetary civilization, i.e. being able to harvest and use all of the energy available on the planet, requires integration of renewable energy resources into the existing grids. To pursue this objective is also to be able to transmit this energy over long distances. Enters High Voltage Direct Current (HVDC) technology, and the project Gridable. Cables are one of the irrefutable components of HVDC technology, and the insulation material of these cables plays an undeniable role in determining their performance. The present thesis is in pursuit of a high-performance, sustainable material for this purpose. A thermoplastic nanocomposite that exhibits reproducible improvements in terms of dielectric properties, while carrying the potential for a sustainable end-of-life.