Catalysis of the reaction: homogentisic acid + all-trans-nonaprenyl diphosphate + 3 H+ = 2-methyl-6-solanyl-1,4-benzoquinonone + CO2 + diphosphate. 2-methyl-6-solanyl-1,4-benzoquinonone is also known as 2-methyl-6-solanesylplastoquinol and all-trans-nonaprenyl diphosphate as solanesyl diphosphate.