The paper discusses a program to demonstrate furnace sorbent injection on a tengentially fired, coal-burning utility boiler. The overall objective of the program is to demonstrate significant reductions in SO2 and NOx, while minimizing any negative impacts on boiler performance. The program, which draws heavily on the procedures established under an earlier laboratory program, also includes unit-specific aerodynamic flow modeling and pilot-scale combustion testing to identify and verify optimum sorbent injection and NOx reduction approaches. The program will culminate with an 8-month demonstration test at Virginia Power's 180 MW(e) Yorktown Unit No. 2. Flue gas humidification and low temperature simulated sorbent recycle for enhanced SO2 removal will also be demonstrated during the 8-month test.