Two mergers prompted by troubled nuclear power construction projects have been finalized.

In the first, Dominion Energy completed its acquisition of Scana Corp. and its utility operations in Georgia, North Carolina and South Carolina. The stock-for-stock merger was worth about $7.9 billion when it was announced in early 2018. Including debt assumption, the value of the transaction was around $14.6 billion.

In the second, NextEra Energy completed its $6.475 billion acquisition of Gulf Power Co. from Southern Company. The sale includes Gulf Power, Florida City Gas and entities that hold Southern Power's interests in two electric generating facilities, Plant Oleander and Plant Stanton. The price included around $1.4 billion of debt.

Dominion's purchase of Scana was prompted by the failure of a nuclear power plant construction project in mid-2017. Scana had been adding two generating units at its V.C. Summer station, but scrapped the project following the bankruptcy of supplier Westinghouse Electric, project cost overruns and completion delays.

Southern was also impacted by the Westinghouse failure, but opted to continue construction under the direction of its nuclear operating unit. The Gulf Power sale, which was announced in May 2018 and was completed Jan. 1, intended to improve the utility holding company's balance sheet.

Dominion Energy's deal closed Jan. 2 and expands its operations in Georgia and the Carolinas. The company already operated an electric utility serving 120,000 customers, a 1,500-mile interstate pipeline principally in South Carolina and nearly 1,000 megawatts of gas, hydro and solar generating capacity in all three states.

Scana Corp. operating companies included South Carolina Electric & Gas Co. (SCE&G), Public Service Company of North Carolina and Scana Energy Marketing. Its services company will be managed by a new operating segment, the Southeast Energy Group.

In July 2017, SCE&G abandoned the construction of two new nuclear units at V.C. Summer. Dominion said that the typical monthly bill for an SCE&G electric customer using 1,000 kilowatt-hours had risen to more than $147 by the time the reactors' construction was halted.

During the summer of 2018, South Carolina temporarily reduced those bills by law. The typical SCE&G residential electric customer will pay around $125 per month under a plan approved by the Public Service Commission. Dominion Energy will provide customer refunds worth more than $2 billion, amortized over 20 years, and the write-downs and absorption of about $2.5 billion in financing obligations, regulatory assets and a natural gas-fired power station.