You need to get the complete understanding from LSG's article. They are only replacing " existing " lighting according to the PR release.
With all the other applications the DC area ( or any other city for that fact ) has to update or add to, SavWatt has many applications around the city where their product(s) will work without the need to run additional power sources to supply them.
Many cities already talking about solar and wind generated lighting. Calif. is another huge proponent of wind and solar projects.
I would consider that phase of deployment to be where SavWatt will " shine " !!