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Q. Why are 20,000 square miles of asphalt, that are already installed in the USA, a major advantage?
A. They are a major advantage because:

Roads are already absorbing solar energy.
Today, like every day, this enormous surface area of asphalt absorbs many, many, gigawatts of solar energy.     
This is true with, or without, a SSC  Energy System.
The difference is: 
Without SSC, the absorbed energy increases heat island effects and
global warming.
With SSC, the absorbed energy reduces global warming and
produces valuable electricity.

Asphalt is a nearly ideal absorber and emitter of energy.
Daytime: Ordinary asphalt is a nearly ideal solar energy absorber.  (The ideal "black body" absorption is 1.0 and asphalt is about 0.90).
Nighttime: Ordinary asphalt is a nearly ideal emitter of radiant heat energy.   (The ideal "black body" emission is 1.0 and asphalt is about 0.95).

The electric grid already connects most roads.
Most asphalt surfaces are in close proximity to the electric grid, thereby enabling high efficiency, low cost,  electricity distribution.
For example, city streets usually follow electric power lines.  Street lights indicate electric grid connection.

SSC is like numerous invisible power plants.
After installation of
SSC Energy Systems, buried in asphalt, the roads look just as they did before
This is the most environmentally friendly renewable energy solution.

The energy is robustly distributed, not centralized.  
SSC systems are highly distributed, meaning that they are "robust" (avoid centralized outages) and transmission efficient.
Centralized systems, (e.g.power plants) are "brittle" (experience centralized outages) and large transmission energy losses.
National security depends on a robust electric grid.  (Terrorists would have to sabotage many
thousands of distributed sites vs. one large central site).
Biology has selected distributed energy storage (e.g. miticondria and ATP) over centralized energy storage. 

Road owners have substantial pooled funds.
Nearly all asphalt roads are owned by large public groups, which can pool resources to fund the installation of the energy systems.
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