(EnviroGEN700 Product Sheet, Cost of Electric Production & ROI Calculations are Below)





The GTG700 has been based on future customer input for large facilities (80,000 sqft. +) operating 24/7. Multiple units can be used to increase total kW/hr output.  Independent testing on the TMAT will be finalized in the middle of November 2014.  Phase I commercialization will be completed in August 2015 with adequate funding.  Manufacturing of the GTG series will begin in the middle of the fourth quarter of 2015.

We still need small and midsize facility input from future customers.  Please contact Sol Electrica's technical department to provide your facilities' system requirements including cogeneration needs.











Sol Electrica Renewable Energy Inc. 200 Viridian Dr, Muskegon MI 49440 ~ (812) 384-5878 / ~ (812) 384-7407

– Gas TMAT Generator

The GTG is a unique solution for greenhouse gas (GHG) reductions and low cost electricity generation.  The GTG uses Sol Electrica’s thermal molecular adhesion turbine (TMAT) and will provide as options recently patented metal-air supercapacitor long-life battery array and GHG abatement combustion technology. The GTG can be quickly installed at any commercial, school, hospital, retail, industrial or government facility which has natural gas access. The elimination of GHG emissions of over 50% and the greatly reduced cost to produce electricity on-site makes the GTG a viable alternative to purchasing electricity from centralized regional coal powered electric companies.

For information concerning return on investment (ROI), regional system cost rebates, carbon credits and retail natural gas (NG) pricing see appendix A.  For cogeneration efficiency and effect on ROI using worst case scenario for retail fuel costs see appendix B.

Internal System Configuration View

Model Number: GTG700-001 / 750kW/h Gas TMAT Generator

Internal System Part Description: 

·         High Efficiency Industrial Saturated Steam Hurst Boiler (200 BHP)

·         Hurst Internal Stack Economizer-SE (9% reduction in fuel usage)

·         Negative Vacuum Condenser Closed-loop Water Flow System

·         Low Maintenance Permanent Magnet 700-750kW/h, 480VAC Alt/Gen Unit

·         TMAT (thermal molecular adhesion turbine) – ‘Plug & Perform’ Easy Upgrade Design

·         System Control Interfaces – Solid State EMP Hardened Electronics

·         Anodized Aluminum Housing With Triple-coat UV Electrostatic Paint with Long Term Corrosion and Weather Resistant Protection

·         Dual Side Natural Gas Access Ports

·         System Control Panels Locking Access Door

·         Removable Skid Mount Hoist Connector Option

·    Electric Junction Box, Grounding Link & grid-tie


Future Options (Commercialized in Phase II)


·         Dual Combustion Catalyst Chambers – CO2 & NOx Reduction System

·         Dual Side Combustion Catalyst Maintenance Panels

·         Long life Metal-air & Supercapacitor Battery Surge Array

·         Adsorption Chiller for commercial cold air production (CHP)

·         Heat Exchanger for commercial heated air production (CHP)

·         Ease of Replacement TMAT – As the TMAT improves in efficiency it can be   upgraded for improved cost of electric production



 GTG700-001 Specifications

Height – 110”
Width – 96”
Length – 26’
Weight (empty) – 22,765 lbs.
Weight (operational) – 32,156 lbs.
NG CFH Usage (peak) – 8,400, 8.4 MCF
Output (peak) TMAT35 – 700+ kW/h
Output (peak) TMAT40 – 750+ kW/h

Future Options:

A – Adsorption Chiller (CHP)
B – Metal-air Battery Array (Surge 75kW)
C – Combustion Catalysts (GHG -50%)
D – Hurst Internal Stack Economizer



The above specifications and product description are very close to the actual system configuration and predicted functionality which will be commercialized in Sol Electrica’s Phase (I) development.



Additional Factors for Further Reduction of Return on Investment (ROI)  

State, Federal and Regional Power Company Rebates – TBD
Carbon Credit Impact – TBD
System Classification (non-regulated power generation) – TBD
Natural Gas Retail Qualifications – TBD

ROI Comparison for Green & Renewable Energy Systems (significant Co-generation savings not included) 

At 95% yearly operation the GTG700 (est. $600,000 installed cost) will have an expected ROI of 2.0 (+1.5, - 0.75) years based on retail price of NG vs. regional commercial price of electricity.  The available COGEN output energy is 1.7 MBTU/hr (million BTUs).

Regional Specific Cost of Electricity  

Using natural gas (NG), the currently most cost effective fuel source, there are several possible retail pricing tiers.  If your company is paying commercial NG costs you can use the $/MCF to estimate your electric production cost.  Here is an example using California* as a test case:

May 2014 commercial average electric cost - $0.1473 per kW/h

May 2014 commercial average NG cost - $8.90 per MCF (thousand cubic feet)

At normal operation the GTG700 requires 8,400 CFH (-9% SE excluded) or 8.40 MCF to produce 750 kW/h using the TMAT40.  Cost of fuel will be $0.0997 per kW/h or 32.32% less than purchased electric.

The GTG700 should qualify as a non-regulated power production customer which would then enjoy a further reduction in NG costs:

May 2014 commercial average electric cost - $0.1473 per kW/h

May 2014 ‘electric power’ average NG cost - $5.48 per MCF (thousand cubic feet)

Cost of fuel will be $0.0614 per kW/h or 58.33% less than purchased electric.

Another method for further cost reductions over commercial costs would be qualifying for volume discounts using the NG providers ‘Transport’** pricing.  The GTG700, at normal operation, would require 736,000 Ccf/year.  This volume would qualify most commercial customers to use the ST Transport Rate which will be lower than their current commercial rate.  Each state’s regions have varying volume parameters to qualify for these reduced rates and should be contacted directly for each areas requirements.


US Fuel and Electric Cost Source Information

  EIA GOV Natural Gas Pricing US
EIA GOV Electricity Pricing US
** DTE MI Natural Gas Retail Pricing Structure




GTG700 Technical Data & System Block Diagram

Below is a block diagram of the GTG700 (gas TMAT generator) with efficiency gains and losses shown in green.  Also, heat transport flow through the system is shown in red.  Calculations are based on standard thermodynamics conversion formulas.


“Internal heat transfer will be discusses that the end of the document”***

The calculations show that for every 8,400 CF/hr 750kW/hr is produced. 

Input firing rate (NG) 8,400 CFH – 8,400,000 BTU (+ Eff. 2% not factored) – 8,400 CFH

      Steam output (150 PSI) 6,900 LBS/HR

      Stack exhaust 1,600 CFM @ 4580F


Boiler horsepower (BHP) is measured in lb/hr steam production. 

1 BHP = 34.5lb/hr 6,900 ÷ 34.5 = 200 BHP

BHP can be converted into BTUs.  1 BHP/hr = 33,475 BTU/hr

200 BHP = 6,695,000 BTUs (steam output to TMAT)

Steam output ÷ 8,400 CFH = 79.7% Boiler efficiency

Stack exhaust ~ 1,705,200 BTUs (CO/GEN output)

BTU/hr can be converted into kW/hr.  3,415.8 BTUs = 1 kW

Total kW input to TMAT    6,695,000 ÷ 3,415.8 = 1,960 kW/hr

Magnetic Gearbox reduction – 98% Eff.

Direct Drive P-Mag Alt reduction – 97.7%


TMAT at 40% efficiency will produce 750 kW/hr at normal operation


      Cost to Produce Electricity in Michigan (TMAT 40 EFF.) 

First, it would be good for business if the GTG700 could qualify for the lowest rate which is the ‘electric power’ price.  By definition ‘electric power’ price is the price of gas used by electricity generators (regulated utilities and non-regulated power producers) whose purpose is the generation of power. 

Customers operating the GTG700 at a 95% rate per year will qualify for the ST transportation rate. 

But since the above can not be easily calculated or expected we will use straight commercial electric to natural gas pricing which will be the worst case scenario.  Instead of a monthly price rate for both we would rather use a yearly average since DTE’s lower end large commercial price has not fluctuated and the NG price is highest in the summer.  Customers will be using year costs to determine their overall ROI. 

2014 commercial electric cost – $0.1182 per kW/hr*

2014 commercial natural gas cost – $8.515 per MCF** (DTE gas rate may be lower) 

The cost of NG (MCF) to produce 750kW/hr ~ 8.40 x 8.515 = $71.53 or $0.095 / kWh
The cost of electricity to produce 1kW/hr = $0.1182
The end user or customer is able to generate their own electricity at 19.63% less than commercial electric prices

Electric cost savings per year - $152,441

ROI (with expected five year maintenance costs built in) - $600,000/152,441 = 3.9 years

Note: ROI does not include cogeneration savings; this will be calculated and added below (1.8 year ROI with COGEN included at minimum)

    Cogeneration Cost Savings
(Stack exhaust ~ 1,705,200 BTU/hr) 

In order to estimate the cost saving for an individual customer one would have to know what type of heating and cooling      equipment they are currently using.  The efficiency, type of fuel used, hours of operation and how energy efficient their facility has been designed.  We will show how many BTUs can be contributed to both heating and cooling and estimate, on the low end, how many hours they would need both types of energy consuming requirements for their interior climate control.  Below is our expected contribution to our customers heating and cooling energy needs.

Heat Exchanger (exhaust to heated air) – 80% for counter current exchange / MVHR (+90 AFUE for costly systems) = 1,364,160 BTU/hr

Adsorption Chiller single-effect (exhaust to conditioned air) - coefficient of performance (COP) 70% (0.6-0.8 range) = 1,193,640 BTU/hr


      3,412.15 BTU/h = 1 kW/h       Thermodynamics conversion


For heating we will use 8 hours at 175 days for the Michigan region for cooling we use 8 hours at 80 days, again please use your own numbers to more accurately estimate the total cost saving for your region.


For heating we use the number of BTUs available from the GTG700 which is 1,364,160

1,364,160 / 3,412.15 = 399.75 kW/h                    399.75 kW x 0.1182 = $47.25 per hour

8 x 175 x 47.25 = $66,150 savings per year for heating


For cooling we use the number of BTUs available from the GTG700 which is 1,193,640

1,193,640 / 3,412.15 = 349.82 kW/h                    350 kW x 0.1182 = $41.37 per hour

8 x 80 x 41.37 = $26,477 savings per year for heating


Combined heating and cooling saving per year = $92,627


Electric cost savings plus COGEN (heat + cool kW/h) per year - $152,441+ $92,627

ROI (with expected five year maintenance costs built in) - $600,000/337,695 = 1.8 years


Note: the price of capital acquisition does not include the cost to the customer to retrofit their heating and cooling system for use with the GTG700 COGEN output. 

As the GTG700 will be continuously providing heated or conditioned air, to a 50 – 100,000+ square foot facility, the facilities heating and air equipment will not be required to be operational for the difference between GTG700 input and facility requirements.  Hence an average yearly saving could be much higher than the above low average.  Again a reduction in fossil fuel use and GHG abatement will occur.



*** Internal Heat Transfer

Combustion only occurs in the boiler and 79.7% of the BTUs produced are used to continuously heat 1,126 gallons of purified water to 358o F at 150 PSI.  The remaining BTUs are exhausted through the boiler stack to produce COGEN energy.

The TMAT will only see 358o F at any given time and since there is very little friction inside the TMAT this internal temperature will not rise significantly.  The TMAT uses the temperature drop of 146o F to convert this energy into power.  The majority of the TMAT power comes from the mass of the working fluid moving at a specific velocity and providing adhesion and viscosity power to the internal flat disc array which is then transferred to the main rotor shaft.  Hopefully you can see from the block diagram where all the heat is being generated and transferred throughout the system.





Gary Kerns - President & CFO Michael Lee - VP of Marketing & New Business Development / 812.384.5878 / 812.384.7407