Exelon Corp.'s $6.8 billion takeover of Pepco Holdings Inc. has been conditionally approved by the Maryland Public Service Commission, bringing the two electric utilities closer to completing a deal struck a year ago.

Shares in Pepco rallied 8.8% to $27 on the news Friday. Exelon shares gained 2.9% to close at $34.50.

The takeover has passed muster with regulators in New Jersey and Virginia, in addition to the Federal Energy Regulatory Commission, but still needs to be cleared by Washington, D.C., where Pepco is based.

The companies have said they expect to close the transaction by the third quarter.

The Maryland commission set as conditions higher reliability standards, $66 million in rate credits, $43.2 million for energy-efficiency programs and another $18.4 million for other programs. The deal has faced opposition in Maryland and in the District of Columbia over concerns that long-distance ownership of the Pepco utility could lead to rate increases and job losses.

In an effort to win clearance in Maryland, Chicago-based Exelon said in March that it would more than double the value of a fund to benefit customers there. The merger would boost Exelon's base by two million accounts to 10 million in five states and Washington, D.C. The company owns three utilities and a large fleet of nuclear, natural-gas and other power plants.

Utilities and power companies have been pairing up over the past few years to combat low power prices and rising costs. Regulated utilities are particularly prized for their ability to pass on costs to customers in monthly bills and provide investment returns that often are virtually guaranteed.

Pairings in recent years include NextEra Energy Inc.'s $2.6 billion deal for Hawaiian Electric Industries Inc., Wisconsin Energy Corp.'s move to buy Integrys Energy Group Inc. for about $9 billion, and Berkshire Hathaway Inc.'s $5.6 billion purchase of NV Energy Inc. Exelon acquired Baltimore-based Constellation Energy in 2012 for about $8 billion, which added two utilities—Baltimore Gas & Electric Co. and PECO—to its single Chicago-based Commonwealth Edison utility. The Pepco deal would bring in three utilities: Pepco, Atlantic City Electric and Delmarva Power.

The Maryland commission found that the proposed merger is "consistent with the broader public interest" and "will bring specific and measurable benefits and no harm to rate payers." It also said the merger will bolster Pepco's efforts to improve its reliability.

"We find that their day-to-day normal weather outages will be reduced, their distribution infrastructure will be improved more quickly and at lower cost, and their ability to recover from outages following major storms will be improved, all because of the merger," the commission said.

Exelon spokesman Paul Elsberg said Friday that company officials were pleased with Maryland's approval but were still reading it "to make sure we understand the conditions.

Other conditions set by the commission include ensuring the utilities are protected against any financial difficulties at the parent company and establishing a $14.4 million fund that would help finance rooftop solar and energy storage projects on customer properties.

Cassandra Sweet contributed to this article.

Write to Lisa Beilfuss at lisa.beilfuss @wsj.com

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