Here is an article from Wired.com that talks about a used cooking oil generator. It's a really neat idea in that the oil is right there anyway. Here is my problem - from the article:
If you put 80 gallons of grease into the thing, that has a finite amount of energy. 5 kilowatts tells you the rate the energy is created. This would be like saying "If the car drives 80 miles, that is the same as driving 5 mph".
The article should have said the energy you can get from 80 gallons of grease. A kilowatt-hour is a unit of energy. This was discussed in the comments for the article, but I just wanted to point that out. This is another example where people confuse something and how that something changes. Not too dissimilar from the confusion between acceleration and velocity.
