NGP Group

NGP Group. Natural Gas Partners VII, L.P., Natural Gas Partners VIII, L.P., Natural Gas Partners, L.L.C. d/b/a NGP Energy Capital Management, and their respective Affiliates (other than the Partnership, the General Partner, ERGP and their respective subsidiaries) and their Affiliate's respective directors, officers, shareholders, members, managers, representatives of management committees and employees (and members of their respective families and trusts for the primary benefit of such family members).