Here is the latest Massachusetts business news from The Associated Press

BOSTON (AP) — Saying Massachusetts leads the nation in health care coverage rates, supporters are marking the fifth anniversary of the state's landmark health care law. They say 400,000 residents have gotten insurance as a result of the initiative. Critics say the state can't afford the law and point to the measure's penalties for those who remain uninsured.

LUDLOW, Mass. (AP) — A Massachusetts electric company says a proposed Connecticut tax on electric generation would cost consumers in Massachusetts more than $9 million a year. The utility owns 4.8 percent of a nuclear power plant in Connecticut, which would be covered by the proposed tax. Connecticut lawmakers say the tax is structured in a way so that it won't be passed along to customers.

BOSTON (AP) — The state's highest court says Massachusetts environmental officials have the power to regulate a water intake system used by the Pilgrim nuclear power plant in Plymouth. The decision by the Supreme Judicial court reverses a lower court ruling. Pilgrim owner Entergy had challenged the state's authority to regulate the water intake process.

SAN FRANCISCO (AP) — Twins Tyler and Cameron Winklevoss have lost their appeal trying to toss out the settlement of their lawsuit accusing Facebook founder Mark Zuckerberg of stealing the idea for the social networking site from his Harvard classmates. A federal appeals court in California says the brothers were savvy enough to understand what they were agreeing to when they signed the agreement in 2008.