Trustpower puts retail book on the block as it seeks to grow its generation base 28 Jan, 2021 04:32 AM 4 minutes to read Trustpower chief executive Dr David Prentice said the focus of the company was on growing its generation business, but it was not a forced seller of its retail business. Photo / Supplied Trustpower chief executive Dr David Prentice said the focus of the company was on growing its generation business, but it was not a forced seller of its retail business. Photo / Supplied NZ Herald Trustpower says a strategic review of its retail business is driven by a plan to grow its generation base, but it will not sell at any price.