EcoWatch: As most Alaskans can attest, energy in The Last Frontier is expensive. The average residential electricity rate of more than 18 cents per kWh is a full 50 percent higher than the national average, ranking among the highest in the country. Thats in part because outside the 50 hydro plants throughout the state, most of Alaskas rural communities rely on imported diesel for their electricity. But the folks of Kodiak Island (pop. 15,000) in southern Alaska--powered almost 100 percent with renewable...