U.S. Department of Energy - Energy Efficiency and Renewable Energy

SunShot Initiative

High Performance Reflector Panels for CSP Assemblies

PPG logoPhoto of a metal stand with flat square-shaped pieces lined up in three rows.

Pictured are high performance mirror samples under test at the outdoor exposure facility at PPG Industries, Inc.

PPG, under the CSP R&D FOA, is aiming to develop and commercialize large-area second-surface glass mirrors that are superior in value, cost, and performance, to existing mirrors on the market today.


This project aims to develop a design and fabrication process for a mirror having:

  • A high solar weighted specular reflectance
  • Minimal optical performance degradation over the service lifetime
  • A cost to the concentrating solar power (CSP) systems builder less than that of the current market price.

The glass and coating developed under this award has gone through a few production runs for commercial purposes. In terms of lowering cost or improving performance, this award may have only minor impact; however, it may prove beneficial from a domestic manufacturing perspective.


This project has the added environmental benefits of a lead-free encapsulant and no wet-silver process wastes. Production of a mirror with the proposed specifications requires that this project deliver:

  • A high transmission glass for the superstrate
  • Optical functional layers that deliver the performance required, an inorganic coating that protects the functional layers from chemical attack
  • An organic coating that protects the functional layers from mechanical attack
  • A cost-effective fabrication process.

Publications, Patents, and Awards

At this time, this project does not have published articles, patents, or awards.

SunShot logo

Quarterly Progress Reports

Learn about other DOE competitive awards for concentrating solar power research that are in progress.