Amendment 01:This amendment updates PWS Appendix D, extends the Projnet question period and extends the proposal due date.Projnet closes for questions on 24 August 2021 at 2:00pm CDTProposal due date is 1 September 2021 at 2:00pm CDTSee file W9127821R0068 Amend 01 Solicitation SAD NERC Model Validation Testing.Original Posting:The United States Army Corps of Engineers (USACE), South Atlantic Division (SAD), Mobile District (CESAM), Savannah District (CESAS), and Wilmington District (CESAW), Hydropower Plants require contractor services to provide all labor, personnel, equipment, supplies, travel, facilities, transportation, tools, equipment, materials, software, licenses, supervision, all off site work, all on site work, etc., to perform testing, model validation, data collection and reporting requirements for the Hartwell, Richard B. Russell, J Strom Thurmond, Buford, Carters, Walter F. George, and John H. Kerr hydropower generators to meet current NERC and SERC Reliability Corporation (SERC) compliance reporting requirements. The model validation reports shall be in accordance with requirements of the current version of NERC standard, MOD-025, MOD-032, MOD-026, and MOD-027 as well as associated SERC Reliability Corporation