They can still be 100%, or 80%, or 30% renewable because renewable energy contracts are actually financial contracts that do not require physical delivery of the electricity to the buyer.

What does energy really mean? 03 Jul 2002 Robert P Crease. Robert P Crease investigates the origin and historical development of the word "energy" ... He called a body’s potential or capacity for ...

Spring potential energy. Thus the spring potential energy is: And you see it doesn't even matter if I push the block at a constant speed or not. Warning: Now say you want to use this new spring ...

What Does It Mean To Be Energy Independent? : 1A The U.S. produces a lot of oil — currently more than 11 billion barrels a day. It produces so much oil and natural gas that overall, ...