federal financial assistance, energy tax policy and compliance, and energy efficiency regulation and enforcement. Its lawyers work with emerging energy technologies such as advanced nuclear, geothermal, hydrogen, sustainable aviation fuels, virtual power plants, and grid-enhancing technologies. The firm represents clients in administrative and constitutional litigation, environmental and climate regulation matters, and energy supply and interconnection issues for data centers and other large customers. Roselle advocates before federal agencies including the Federal Energy Regulatory Commission and the Department of Energy, state regulators, legislators, and federal courts.