When Dr. Rossi’s e-cat technology is released, the power grid will go through a lot of twists and changes, but it may not die.
I am sure that very early in the cycle, projects with heavy development bills will be abandoned, such as hydroelectric dams. The things cost millions of dollars, and are expected to pay for themselves over a 20 to 50 year life cycle. If energy is becoming all but free, all of that construction will never pay off.
If hydroelectric dam development is suddenly halted, then the community that the dam was intended to serve will be served by Rossi generators very early. Other electric generation plants, whether they be oil, gas, coal or nuclear fired, all have high development costs. All of these projects that are not at least nearly completed will be abandoned, and Rossis will replace them.
Next will come replacing existing plants with Rossi plants. This will probably be done on a cost-benefit basis. The ones that use the most expensive fuels will be removed first. Plants that are getting old will be removed early. As hydroelectric is one of the least expensive sources of power, it will be the last to go. Coal plants, though they are cheap, may get pressured to go out early because they have higher carbon footprint.
At some point in time, homes, apartment buildings and corporations will be popping off the grid fast enough that excess capacity will become the issue of the electric company. Again, they will be decommissioning power generation, most expensive, or possibly most polluting, first. However, the electric companies will not be buying a lot of Rossis.
At some point, electric companies will have to consider whether to continue in business as Rossi-power providers, or to simply go out of business. I do not know the cost of grid maintenance. Certainly grid maintenance is much less expensive than grid development. If electric companies could replace expensive power systems with Rossi power, they would only need to charge people the cost of power transmission plus reasonable profit. With this kind of low cost grid power, it may not make sense for residences, even small corporations, to buy and maintain their own generation systems when they can buy power for cheap.
However, When a Rossi generator will run for 6 months on a stack of nickels, it is doubtful that building new grid will ever make sense. The third world, in particular, will have a strong move to power generated on site, eliminating the cost of grid development.