PJM is hesitating on plans to introduce more sophisticated modeling of combined-cycle plants because of an inability to quantify potential savings and reports of escalating prices.

PJM last week proposed eliminating some generators from the calculation of Tier 1 synchronized reserves.

PJM dropped a proposal to consider changes to the regulation market after receiving a cool reaction from stakeholders and the Market Monitor.

PJM and the IMM said they will target traders who schedule interchange trades for the last 15 minutes of an hour based on price differentials in the first portion of the hour, a scheme known as “slamming the close.”

Exelon and Pepco told FERC last week that competitive and environmental concerns raised over their proposed merger are unfounded.

PJM capacity prices would increase sharply but reliability would not be threatened if a recent federal court ruling eliminated demand response from wholesale markets, the Market Monitor said.

Load representatives concerned by reports of generators’ bidding strategies in May’s PJM capacity auction reacted by threatening to block an initiative by Exelon Corp. to provide more informative supply curves.

The Market Monitor said members should reject proposals to change the way capacity supply curves are represented, saying they would expose confidential data.

FERC may need to reconsider its fuel-agnostic policies to preserve coal and nuclear generation threatened by environmental rules and market forces, Commissioner Tony Clark told the PJM Annual Meeting last week.

PJM said last week it agrees with about one-quarter of the recommendations in the Independent Market Monitor’s 2013 State of the Market report.