Renewable and Sustainable Energy
![Figure 1 — Lights of the United States power grid prior to July 2, 1996.](/vault/img/2011/05/10/4dc92b86c29e068473000b5e/medium/1figure1.jpg)
Figure 1 — Lights of the United States power grid prior to July 2, 1996.
![Figure 2 — The same power grid after a single branch fell on a single power line in the Northwest.](/vault/img/2011/05/10/4dc92b86c29e068473000b5f/medium/2figure2.jpg)
Figure 2 — The same power grid after a single branch fell on a single power line in the Northwest.
![Figure 3 — Kneeland residence in Soldotna, Alaska.](/vault/img/2011/05/10/4dc92b86c29e068473000b60/medium/3kneeland-alaska.jpg)
Figure 3 — Kneeland residence in Soldotna, Alaska.
![Figure 4 — Click dome located in Bandera, Texas.](/vault/img/2011/05/10/4dc92b86c29e068473000b61/medium/4click-texas.jpg)
Figure 4 — Click dome located in Bandera, Texas.
![Figure 5 — Frontier Elementary in Payson, Arizona.](/vault/img/2011/05/10/4dc92b86c29e068473000b62/medium/5frontier.jpg)
Figure 5 — Frontier Elementary in Payson, Arizona.