Electricity markets have become very competitive, with scores of suppliers offering products including renewable power, long-term fixed rates, and substantial discounts from the utilities' default rates.
But the gas markets are not as dynamic because there are fewer opportunities for marketing companies to acquire gas supplies at substantially less than utilities pay.
A 2005 report by the PUC concluded there was not effective competition in the retail gas market, but the commission has changed some rules to remove obstacles for suppliers.
"We think there are enough suppliers in the market now that we launched the website," said PUC spokeswoman Jennifer Kocher.
About 14 competitive suppliers have offers to Peco Energy Co. customers listed on the PUC's website. But only six are priced below Peco's rate. And most of the offers are for rates that vary month to month, which means customers who switch need to stay vigilant to make sure their rates stay competitive.
"You can't acquire customers with a price higher than the utility's 'price to compare,' " said John C. Raisch, chief marketing officer of Alphabuyer.com, a Paoli group-buying firm.
Alphabuyer is offering Peco gas customers a price "just a hair under" the utility's rate" of 52.2 cents per hundred cubic feet of gas. Raisch said gas customers who have switched have saved a larger amount over the long haul.
No alternative suppliers have entered the Philadelphia market, even though the city-owned utility, Philadelphia Gas Works, has a higher rate of 57.1 cents.
The PGW market is unattractive, competitive suppliers say, because they face greater risks of losses from nonpaying customers.
PGW reimburses suppliers for 95 percent of the money they are owed from nonpaying customers. Since the city-owned utility has a large number of customers who fail to pay, suppliers say they are unable to factor those losses into their gas price.
Utilities, on the other hand, are able to recover the losses from nonpaying customers by including the costs in their rates.
PGW also requires suppliers to bill customers separately, rather than to include the charges on its bills, increasing the administrative costs for suppliers.
Contact Andrew Maykuth at 215-854-2947, @Maykuth on Twitter or email@example.com.