TXU Energy, the prominent Dallas-based electricity provider, announced early this month that its popular TXU Energy Cash Back Loyalty Reward program has reached an astounding $100 million in rewards for customers.

The program, implemented five years ago, offers customers the opportunity to earn 3 percent of their annual electricity bill in rewards, and on some occasions even more, simply for paying the bills.

Any eligible customers who pay their electricity bill on time every month for 12 consecutive months will receive the reward in the form of a Visa prepaid card, which can be used in any place that a credit card could be used.

With 2011 wrapping up, TXU announced that its customers had earned another $30 million in rewards, bringing the company over the $100 million threshold.

"We're very proud of this as not only does the cash back help customers who participate in these plans, it also supports the communities where they live and work each time they swipe one of the prepaid cards for a retail purchase," Michael Grasso, chief marketing officer at TXU, said in a statement.