It is important to understand why the threat assessment about EMP deserves to be taken very seriously. The reports and background materials listed here examine the vulnerability of the U.S. power grid, including its current state, its ability to withstand an EMP event, and the feasibility and estimated costs to harden the power grid. The findings unanimously indicate the U.S. power grid is, in its current state, vulnerable to an attack and it is critical that we address it.