An energy crises requires that people be unable to adapt to it, their cars run out of gas and instead of finding alternatives they just starve. Lack of adaptability turns this into a major holocaust, but what really happens is the price of a certain fuel source goes up and people react to it, for instance our current recession began with a run up of gas prices in 2008, this triggered a housing collapse which created a recession and a stock market plunge that got Obama elected. This recession has lasted six years, and during this time people have discovered new ways of recovering oil, that is fracking, also a number of hybrid and all electric model cars have been introduced. Now in 2030, there will probably be more electric cars on the road, and then thing about electric cars is they run on whatever energy source that generates the electricity that they run on, so they could run on coal, oil, gas, hydropower, nuclear energy, solar, and some of these energy source are effectively inexhaustible, we have about 200 to 1000 years worth of coal at the current usage, hydropower will be a constant source, solar cells will get more efficient and cheaper to manufacture.