Attorney General Martha Coakley is trying to find out if a new tax in Connecticut could force Massachusetts homeowners to pay more for their electricity.

Coakley is asking the head of ISO New England for an analysis about what impact the tax hike could have on Bay State consumers.

Connecticut Gov. Dannel Malloy recently signed off on a deal to tax electricity generators one quarter of 1-cent per kilowatt hour, or 25-cents per $100.

Coakley said that since the regional energy market is so interconnected, the Connecticut tax could end up raising the cost of electricity throughout New England, including Massachusetts.

Coakley said ISO New England is the only entity with full access to market data.

As attorney general, Coakley is the official ratepayer advocate for Massachusetts consumers. (AP)