Our patented Clean Fleet® technology is proven to successfully reduce emissions by 99%, dramatically decrease sound pollution and generate operational cost savings upwards of 90% of fuel costs. This technology is the first fully electric, fully mobile well stimulation system powered by natural gas in the industry.

Clean Fleet Pump Truck

Our electric-powered Clean Fleet® advances hydraulic fracturing environmental responsibility by reducing re-fueling traffic, site noise, and emissions. While a conventional fleet must transport diesel fuel to the well site, natural gas for the turbine gen sets is delivered more efficiently directly from a pipeline. Subsequently, the use of natural gas eliminates approximately 25 diesel truck deliveries to the well site required for an average horizontal completion. This not only reduces traffic in communities, it also eliminates fire hazards and spills associated with re-fueling operations. Ultimately, the use of produced field gas reduces fuel operating costs by as much as 80%.

Clean Fleet Transformer Trailer

Clean Fleet® transformer trailer with VFD housing

Clean Fleet® successfully reduces hazardous emissions to near-zero levels. As confirmed by independent 3rd party testing, Clean Fleet® decreases emissions by 99% compared to conventional diesel powered fleets, all but eliminating environmental exposure to pollutants such as nitrogen oxides (NOx) and carbon monoxide. Specifically, NOx emissions measured on the turbine exhaust stacks were found to be 0.036 grams per kilowatt hour (g/kW-hr) which is a drastic reduction compared to the Environmental Protection Agency’s (EPA) requirements for off-highway diesel engines. This reduction is achieved by eliminating all conventional diesel engines and replacing them with electric motors powered by natural gas generators. Clean Fleet® technology also eliminates methane slip issues observed in dual fuel technology applications.

Emissions Graph

Comparison of Clean Fleet® NOx emissions to diesel engines measured by independent test

Clean Fleet® with Whisper Technology is the industry’s foremost solution for quiet, low noise impact hydraulic fracturing. Clean Fleet® well stimulation technology significantly reduces noise pollution, making the workplace safer and less disturbing to surrounding communities. Conventional diesel stimulation sites are extremely loud with some locations measuring as high as 129.5 decibels one foot away from the equipment.

U.S. Well Services employed a third party to perform a sound survey of the electric fleet and compared it to a conventional site. More than 140 total monitoring locations were recorded and the result was up to a 69% reduction in the average sound pressure at the Clean Fleet® stimulation site.

Sound Pressure for Site

Electric hydraulic fracturing is significantly quieter

Clean Fleet® technology leads the way in advancing safety via reduced vibrations and fatigue of treating iron. Our electric fleet reduces high pressure iron vibrations by up to 80% as compared to diesel powered equipment. These results were validated by installing three dimensional (3D) accelerometers on diesel powered equipment and comparing this baseline to the accelerations recorded on the electric powered equipment (graphs below). This dramatic reduction in vibrations is achieved by replacing the engine and transmission with a VFD that controls the electric motor which is direct coupled to the hydraulic fracturing pump.

Vibration Graphs

Comparison of Clean Fleet® treating iron vibrations to conventional fleets

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Conventional Fleet (Diesel)

U.S. Well Services provides industry-leading well stimulation services to our clients by excelling in the following key areas:

  • State-of-the-art uniform hydraulic fracturing fleets designed and manufactured by industry leaders
  • Triplex and Quintuplex stimulation pumps rated to 14,500 psi
  • Blenders rated to 130 bpm
  • USWS fleets are among the newest on the market
  • State-of-the-art air filtration units utilized, keeping silica dust below permissible exposure limits (PEL)
  • “A” rated member of ISNetworld
  • Designated Safety & Spill Prevention Coordinator provided during every fracturing stage
  • Rigorous preventative maintenance program minimizes non-productive time (NPT)
  • Long term allotment of high quality API spec sand contracted
  • Strategically placed transload and storage facilities
  • USWS utilizes a combination of company owned and third party pneumatic hauling companies in addition to SandBox® Logistics for proppant deliveries to location
  • Secure chemical supply from industry-leading suppliers
  • Utilizes “green” / low toxicity fracturing additives, including guar alternatives


The following U.S. Well Services products are protected by patents in the United States and other countries around the world. This website is intended to satisfy the virtual patent marking provisions of various jurisdictions including the virtual patent marking provisions under 35 U.S.C. § 287(a) of the America Invents Act. The following lists for each product may not be all-inclusive, and additional patents may apply to such products. The following lists do not preclude U.S. Well Services from pursuing any and all legal rights we may have related to the products, including intellectual property rights. U.S. Well Services products not listed here may be protected by one or more patents.

  • United States Patent No. 8,789,601 U.S. Well Services
  • United States Patent No. 9,410,410 U.S. Well Services
  • United States Patent No. 9,587,649 U.S. Well Services
  • United States Patent No. 9,611,728 U.S. Well Services
  • United States Patent No. 9,650,871 U.S. Well Services
  • United States Patent No. 9,650,879 U.S. Well Services
  • United States Patent No. 9,745,840 U.S. Well Services
  • United States Patent No. 9,840,901 U.S. Well Services
  • United States Patent No. 9,893,500 U.S. Well Services
  • United States Patent No. 9,970,278 U.S. Well Services
  • United States Patent No. 9,995,218 U.S. Well Services
  • United States Patent No. 10,020,711 U.S. Well Services
  • United States Patent No. 10,036,238 U.S. Well Services
  • United States Patent No. 10,119,381 U.S. Well Services
  • United States Patent No. 10,107,086 U.S. Well Services
  • United States Patent No. 10,232,332 U.S. Well Services
  • United States Patent No. 10,254,732 U.S. Well Services
  • United States Patent No. 10,337,308 U.S. Well Services