About Whertec

  • Ontario Power
  • P. H. Glatfelter
  • Pacific Gas & Electric (PG&E)
  • Packaging Corporation of America (PCA)
  • Piney Creek: L. P.
  • PPL Corporation
  • QIT-Fer et Titane
  • Sappi Fine Paper
  • Smurfit Stone
  • Sonoco
  • Southern Company
  • Tate & Lyle
  • U. S. Steel
  • Weyerhaeuser