TVA is the Tennessee Valley Authority. Tennessee and several surrounding states get their power from them. To best explain the new cost, I copied and pasted this from a newspaper article. "TVA electricity rates will jump another 20 percent in October, a move Tennessee Valley Authority officials...

Did you know there's a 25% additional charge for a TVA adjustment? The cost varies, depending on how much your bill is to start with. We have a 2,200 sq ft double wide and our latest bill was $300. $55 of that was for the TVA power cost adjustment. Our house is all electric, and we have a heat pump....