New York Times: While we all worry about where we’re going to get more energy in an increasingly energy-obsessed world, there’s also another alternative: Use less power. That may soon be simpler, thanks to the introduction of a bevy of inexpensive devices that let homeowners monitor how much energy appliances, TVs, PCs, and heating and cooling systems actually use. Even energy-conscious people can go only so far in managing their home energy use. Sure, we can fiddle with our thermostats, shun …