SCECorp., the Rosemead-based parent of Southern California...

SCECorp., the Rosemead-based parent of Southern California Edison Co., reported second-quarter earnings of $158.1 million, down 5.6% from 1991’s $167.5 million, in part because the state lowered Edison’s authorized rate of return on equity.

Revenue of $1.76 billion was up from $1.7 billion a year earlier.

Profit at SCECorp.’s unregulated Mission Group unit was flat.