Solar Fraction Posted on 21st December 201513th November 2023 by ThePD (The Project Definition) Solar Fraction is the percentage of energy provided by the solar thermal system divided by the total energy required. Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in Renewable Energy and tagged energy, renewable energy, solar energy. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.