Constellation Energy Group Inc., owner of Baltimore’s utility, bought a minority stake in closely held Astrum Solar Inc. to offer solar installation services to its 1 million retail power customers.

Annapolis Junction, MD — Astrum Solar ("Astrum") and Hudson Clean Energy ("Hudson") announced today the signing of a partnership agreement, whereby Hudson will provide Astrum with up to $100 million ...

Back in March, Shelley Cohen and Mike Gala sent out a request to contractors to submit proposals on their project: to have solar panels installed on the roof of their colonial home in the District.

Astrum Solar still is looking for new markets in states with good solar environments, she said. Having a Maryland company in the No. 2 spot on one of these national lists is encouraging, said Ursula ...

Astrum Solar officials said the average solar electric system in Cumberland County right now is about 5 kilowatts, which has an initial price tag of about $30,000. With a 30 percent federal tax credit ...