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Articles by Sean Sullivan
Virginia Tightens Air Permitting for Data Center Backup Generators: Tier 4-Equivalent Emissions Limits Now Required
Summary — Virginia has adopted new emissions requirements for data center backup generators, requiring applications submitted on or after July 1, 2026, to meet Tier 4-equivalent standards. The rules may affect generator selection, permitting, project costs and ongoing compliance obligations. Developers and operators should also monitor further DEQ guidance, particularly regarding how the requirements will apply to existing facilities that add or replace generators.
Sean Sullivan
Why Young Giant Slalom Skiers Lose Speed: Understanding Energy Dissipation Why do young giant slalom skiers lose speed while elite racers seem to carry momentum effortlessly from turn to turn? This coaching article explains how energy dissipation, line choice, depth, pressure management and clean turn release influence speed and efficiency in giant slalom. By Sean Sullivan | July 14th, 2026 | Tags: newtemp |
Why Young Giant Slalom Skiers Lose Speed: Understanding Energy Dissipation
Every coach has watched a young giant slalom skier throw the skis sideways at the top of the turn, only to lose speed before reaching the next gate. While that movement often gives athletes a greater sense of control, it comes at a significant performance cost. Understanding how energy is conserved—and how it is unnecessarily dissipated—is fundamental to helping young skiers become faster and more efficient. In giant slalom (GS), managing energy is one of the most important factors in skiing fast.
North Carolina’s Statewide PFAS Discharge and Biosolids Studies
Summary — North Carolina’s new Water Safety Act launches a statewide effort to identify the sources of PFAS (“forever chemicals”) discharges into surface waters from direct dischargers, indirect dischargers and biosolids land application sites. While the studies are primarily focused on gathering data rather than immediate enforcement, the findings are expected to shape future PFAS regulations, making it important for affected facilities to prepare for potential new requirements.
North Carolina Brownfields Updates
The North Carolina legislative Session Law 2025-53 made some important changes to the tax incentives and fee structure for North Carolina’s brownfields program. One of the revisions makes it clear that improvements constructed after a developer enrolls a project in the program, but prior to recordation of the final agreement, are eligible for the state’s significant property tax incentives.
Op-Ed: Keeping Power Bills Affordable for South Carolina Families
This summer has been one of the hottest on record across South Carolina, and with that heat has come something far too many families’ dread: sky-high power bills. When the temperature rises, air conditioners run longer and harder, and suddenly the monthly energy bill feels like another mortgage payment. For many in Mount Pleasant and communities across the Lowcountry, those costs are stretching household budgets to the breaking point. Affordable, reliable energy isn’t a luxury, it’s a necessity.
Environmental Notes - October 2025
By Jessica J.O. King On September 4, 2025, the White House published its Semiannual Agenda of Regulatory and Deregulatory Actions in which it discussed EPA’s plans regarding the issuance or revocation of regulations under certain environmental laws including the Toxic Substances Control Act (TSCA), the Safe Drinking Water Act (SDWA), the Clean Air Act (CAA), and the National Environmental Policy Act (NEPA).
Clean energy tax credits are critical for SC businesses
With the clean energy tax credits from the Inflation Reduction Act, businesses have announced plans to create over 20,000 new clean energy jobs and invest over $32 billion into South Carolina’s economy over the next decade. These strategic investments in advanced energy manufacturing, electric transportation, and electric grid resilience are powering job creation, revitalizing rural areas, and positioning South Carolina as a national leader in American-made energy.
Clean energy tax credits are critical for SC businesses
With the clean energy tax credits from the Inflation Reduction Act, businesses have announced plans to create over 20,000 new clean energy jobs and invest over $32 billion into South Carolina’s economy over the next decade. These strategic investments in advanced energy manufacturing, electric transportation, and electric grid resilience are powering job creation, revitalizing rural areas, and positioning South Carolina as a national leader in American-made energy.
Environmental Notes - October 2023
Submitted by tharris on October 19, 2023 - 12:47pm News Environmental Notes - October 2023 Click on the image below for a full PDF of the Environmental Newsletter.
North Carolina’s Wetlands Saga is Over (for now)
As a result of the North Carolina Farm Act of 2023 (Session Law 2023-63), North Carolina’s Department of Environmental Quality (NCDEQ or the Department) may now only regulate wetlands that are subject to federal Clean Water Act jurisdiction. While developers will certainly appreciate the absence of a source of delays and expense, only time will tell how the resulting losses of non-jurisdictional wetlands affect water quality.
Sean Sullivan’s Return to Williams Mullen Covered by Law360
07.07.2023 Sean Sullivan’s Return to Williams Mullen Covered by Law360 Sean Sullivan, a partner in the Environment & Natural Resources Group in our Raleigh office, was interviewed by Law360 regarding his return to Williams Mullen. Sullivan shared that returning to the firm made sense for his practice, citing the firm's large environmental practice and dynamic leadership, but that it also felt like coming home. To read the full article, click here.
Veteran Environmental Partner Sean Sullivan Returns to Williams Mullen | Williams Mullen
Williams Mullen is pleased to announce Sean M. Sullivan has rejoined its Environment & Natural Resources Group as a partner in the firm’s Raleigh office. Sullivan advises clients throughout the country regarding major federal environmental programs, with a particular emphasis on hazardous waste, Brownfields redevelopment, the Clean Water Act, the Clean Air Act, and emerging contaminants like PFAS and 1,4-dioxane. He is recognized as a “Band 1” attorney by Chambers USA for Environment Law.
Federal Government Needs to Control Debt and Protect America at the Same Time
Since 2001, our nation has added about $1 trillion a year to the national debt. It currently stands at $31.4 trillion and is at our maximum amount of debt the federal government can incur, or our debt ceiling. While we continue to incur debt, we are simultaneously sending billions of dollars of military hardware abroad. Politicians need to balance the dual national security concerns of a debilitating crushing debt and providing enough resources to protect America. Our government can do both.
Federal Government Needs to Control Debt and Protect America at Same Time
Since 2001, our nation has added about $1 trillion a year to the national debt. It currently stands at $31.4 trillion and is at our maximum amount of debt the federal government can incur, or our debt ceiling. While we continue to incur debt, we are simultaneously sending billions of dollars of military hardware abroad. Politicians need to balance the dual national security concerns of a debilitating crushing debt and providing enough resources to protect America. Our government can do both.
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