Power: clean, dispatchable, and reliable.
Power: clean, dispatchable, and reliable.


PORTSMOUTH, NH (August 15, 2019) –  FlexEnergy Inc. channel Partner MBS Engineering (in San Ramon, CA), has designed a mobile natural gas-powered hemp drying unit, utilizing the Flex Energy GT333S model gas turbine generator. MBS, using Flex Turbines®, will be the exclusive manufacturer of commercial mobile hemp drying units, to be used and sold by a large-scale Oregon-based commercial hemp grower, TumbleWeed. The unit, which is enclosed in a semi-trailer, is called the ‘Black Hemp Box’, and is capable of drying 75,000 lbs. of wet hemp per hour (altering it from 70% water to 5% water as it is prepared to be pressed for distillation and accretion of CBD oils).

While hemp has historically been used for products like textiles, rope and clothing, it can be used for plastics and even biofuels. It has come to prominence lately for yielding CBD extract, a substance used to manage pain, inflammation, and symptoms of neurological disorders, and which – unlike THC harvested from marijuana – is not mind-altering. With large-scale pharmaceutical growing operations entering the industry alongside even smaller growers, industry experts predict commercial CBD sales to approach $20B annually in the next few years. Black Hemp Box is intended to allow growers to keep power generation infrastructure (and therefore costs) to a minimum by allowing the redeployment of costly dryers to different regions, as the harvest or need dictates – within or between multiple growing operations.

The process of extracting CBD oil from hemp requires that moisture be removed from harvested hemp before the dry plant matter is pressed. This drying process consumes significant amounts of thermal energy, to vaporize and expel water, in addition to electricity to power conveyors, separators, and other production machinery. Gas turbines are ideal because they produce both thermal and electrical energy: beside ‘keeping lights on’, ‘waste’ heat  from gas turbines can be harvested to heat (and dry) plant matter. This dual power profile is called ‘cogeneration’ and brings gas turbines close to 90% efficiency. Cogeneration or CHP (combined heat and power) from gas turbines is so efficient and eco-friendly an option for power generation that – when thermal loads are part of the power generation profile – the Department of Energy and the Environmental Protection Agency advise them. Gas turbines are ideally suited for operations that cannot afford ‘grid down’ scenarios. “It’s no secret that industry and the commercial sectors are highly vulnerable to large-scale utility power outages from circumstances such as technical power failures, system overload, cyber-attacks and severe weather,” said Mark Schnepel, President of FlexEnergy. While even gas turbine generators can generate power ‘off the grid’ and are more disaster resilient than grid electric, they do require a piped (gas) fuel source. The Black Hemp Box contains its own fuel.    

While the technical details of the Black Hemp Box are proprietary, the unit sits inside a black semi-trailer, and is comprised of a power/heat-generating unit and a drying unit. Power comes from a Flex Energy GT333S with an electric starter, and the power profile is both electrical and thermal. The turbine is fueled by an onboard liquid propane gas (LPG) fuel tank and is housed in an exterior ‘blanket’ or heat recapture shell. Ducting moves hot air and mass flow to the drying unit for the drying process, which consists of a hopper and conveyor, and super-heated air dries (but does not burn) plant matter. Assembly is minimal, as the point of the mobile hemp dryer is to permit rapid pack-up and redeployment, with minimal downtime or technical requirements.

Static gas turbine generators are already a popular option for cannabis grow rooms and greenhouses. “[G]rowers are paying approximately $150,000 a month for 1.3 megawatts of power from the grid. Our off-grid solution delivers power at about half that cost with the turbine financing and gas supply combined.” James continues, “We hope to make the gas turbine option still more appealing by adding ‘location flexibility’ to that list of benefits.”

About Flex Energy

FlexEnergy is a manufacturer of natural gas powered microturbines and custom-fit heat exchangers. The company’s Application Engineering group develops combined heat and power solutions designed to produce specific performance outcomes for leading organizations worldwide. The Flex Turbine® is the highest quality and most robust natural gas powered microturbine available in its class, developed over the course of two decades by Ingersoll Rand before being acquired by FlexEnergy in 2010. Flex Turbine technology is ultra-reliable, has low maintenance requirements, produces the least emissions of any competing option and has wide fuel tolerance without any special configuration from the factory. FlexEnergy heat exchangers offer durability and class-leading performance in extreme heat environments. FlexEnergy is headquartered in Portsmouth, New Hampshire.

About MBS Engineering

MBS Engineering are licensed general engineering and Class A and C-36 commercial natural gas contractors in the state of California, with extensive experience with custom design, fabrication, diagnosis and remediation of complex natural gas systems, components, and hardware. MBS Engineering specializes in installation and systems engineering of innovative custom gas microturbine power provision solutions, servicing the western United States and beyond. MBS Engineering is Gold Shovel certified by PG&E, and services hospitals, universities, k12 schools, hotels, defense, transportation, and critical infrastructure across the state of California.

Flex Energy Solutions

Contact: Tom Hughes
Phone: (949) 275-5167
Email: tom.hughes@flexenergy.com
Web: FlexEnergy.com