About Northern Tier Greens

Northern Tier Greens Greenhouse located on Route 6 in Troy, Pennsylvania uses a portion of waste heat from Northern Tier Solid Waste Authority’s (NTSWA) electric generating facility. NTSWA generates electricity from the decomposing garbage which in turn runs a CAT3520 engine. From the engine, NTSWA is able to operate Northern Tier Greens, a 14,400 square foot hydroponic greenhouse. The greenhouse uses a number of unique approaches to commercially grow lettuce type crops and herbs 365 days per year.


The decomposing waste produces methane gas, which is collected and used to fuel a CAT 3516 engine. Hot water and electricity from the engine is used to heat and light the greenhouse. The resultant electrical energy is sold to the local power grid.

Northern Tier Greens uses deep pool hydroponics and liquid oxygen to replace aeration. The greenhouse utilizes 96 growing lights, which are run at night when electric sales are low. Hot water from the CAT 3520 engine heats the greenhouse through radiators fitted with forced air, collapsible vinyl ducts and the pond water can also be heated through pex tubing. During summer months Northern Tier Greens developed a natural air conditioner to cool the greenhouse which consists of a recycled corrugated fiber wall at one end of the greenhouse. A piping system distributes water down over the front of the wall and fans pull a vacuum from the other end of the house, therefore evaporating the water and cooling the air. A computer system is installed in the greenhouse to adjust a controlled environment.

lettuce pondThe greenhouse is constructed with four raised beds. Each bed grows enough lettuce to support our constant demand. From seed to harvest takes approximately 30-35 days.

Northern Tier Greens has a large variety of greens from Pak Choi to Basil and Cilantro to many different lettuces. See below for a product list as well as pricing. All of our greens are USDA Certified and are free of pesticides and herbicides.

Have questions or would like to see our state of the art Greenhouse? Contact us today to schedule a tour!