A raft of US firms have taken roles on The Blackstone Group's $4.7bn (£3bn) acquisition of energy company Dynegy in one of the largest leveraged buyouts of 2010 so far, reports The Am Law Daily.

Simpson Thacher & Bartlett is representing longstanding private equity client Blackstone on the deal, with corporate partner Wilson Neely and energy and infrastructure practice chair David Lieberman leading the firm's team.

Last October Neely advised Blackstone on its $2.3bn (£1.5bn) acquisition of theme park company Busch Entertainment.

Sullivan & Cromwell is advising Houston-based Dynegy with a team comprising M&A partners Joseph Frumkin and Audra Cohen, tax partner David Spitzer and executive compensation partner Matthew Friestedt

Dynegy's independent directors also turned to Frumkin and Sullivan last year for the $1bn (£640m) selloff of nine power plants to LS Power Associates.

Meanwhile, Fried Frank Harris Shriver & Jacobson corporate partners Philip Richter and Gus Atiyah advised Goldman Sachs and Greenhill & Co as lead financial advisers to Dynegy.

Dynegy is being advised on employee benefits matters by Locke Lord Bissell & Liddell, while King & Spalding is providing regulatory advice.

Blackstone is also receiving $1.36bn (£870m) from Princeton-based power producer NRG Energy for ownership of Dynegy plants in California and Maine.

Kirkland & Ellis energy practice chair Mitchell Hertz took the lead advising NRG on its side deal with Blackstone, along with corporate partners Gerald Nowak and Patrick Grooms and energy partner Elaine Walsh.

The Am Law Daily is a blog on law.com, Legal Week's US affiliate title.