HARRISBURG, Pa. (AP) — Top state Republican lawmakers have reached an agreement on a package of tax breaks that Gov. Tom Corbett has sought in hopes of encouraging the construction of a multibillion-dollar petrochemical refinery and an associated chemical manufacturing industry in Pennsylvania, lawmakers and legislative aides said Thursday.

Under the agreement, there would be no limit on the tax break — Corbett had proposed capping it at $66 million a year, or almost $1.7 billion total. But it would keep the Republican governor’s proposal for a tax credit of a nickel per gallon of ethane used by a qualifying refinery owner.