Zeropex has developed a patented pressure reduction technology called Difgen that can harvest untapped energy from water and utility infrastructure. The Difgen turbine uses variable speed impellers to control pressure differentials while generating electricity. Pilot projects show the technology improves efficiency, provides predictable power generation at low cost, and achieves payback in under two years due to revenue from electricity sales and reduced operating expenses. Zeropex aims to commercialize Difgen to unlock renewable energy sources from existing water and wastewater systems around the world.

1. An Energreen Company
Harvesting untapped energy in the water
and utility industry
www.zeropex.com

2. Company overview
Zeropex Energreen Group
• Established 2006
• Current Product Range • Shareholders
– Difgen (0-80 kW) commercially available – Energy Ventures
– 2. generation (0-300kW) in Pilot testing • Norway largest venture fund
– HP energy recovery-Desal (up to 1MW)
in detail development
– Statoil Venture
– Founders
• Energreen’s Mission is to create
• 100% owned by Energreen Group
profitable and sustainable energy
sources from existing industrial
• Head office – Sandnes, Norway processes
– Current staff of 10
• Zeropex is the exclusive
commercialization partner for the
proprietary Energreen technologies
within the water and utility sector

3. Team
Board of Directors Management Team
• Chairman – Erik Thorsen, former • Trond Melhus, CTO and co-founder –
CEO of REC and Tomra. Wide 30y+ experience from offshore operations,
construction and management.
experience from international Turned serial entrepreneur
operations and renewable energy
• Per Reidar Ørke, co-founder – 20y
• Einar Gamman – Partner Energy experience with product development
Ventures. Former senior management from National Oilwell and Laerdal Medical
positions in oil service companies • Tor Albert Ersdal, CEO – 15y
experience from growth companies both
• Arne Frøiland – Partner Statoil from the entrepreneur and investor
Ventures. Former senior management perspective. Experience include successful
positions in renewable energy stock listing and trade sales.
companies.

4. Benefits to Customer

5. Operational benefits
• High quality electricity
• High efficiency over a wide
range of flows
• Adaptive Pressure and Flow
Control
• Predicable Electricity
Generation
• Designed to meet all relevant
standards
• The system can be used to
pump water when required
• The system can be used as a
UPS when conditions allow
• Maintained by Zeropex certified
engineer
– Pump engineers will qualify for
certification program
– Maintenance procedure takes 6-12
hours per year

6. Financial benefits
Value per kWh 0,11 USD
WACC 4% percent
Efficiency 70 % percent
Equipment investment 580 000 USD
Input
Other investments 20 000 USD
Investment support 25 000 USD
Flow rate average 15,0 mgd
Pressure in 120 psi
Pressure out 20 psi
Differential pressure 100 psi
Theoretical Power 444,50 kW
Production in kW average 311,15 kW
Annual production 2 725 666 kWh
Annual revenue 299 823 USD
Output
Payback 1,92 years
IRR 98 % percent
NPV 3 147 157 USD
CO2 reduction 1 462 tonnes
Opex per kWh 0,011 USD
Capex per Watt 1,9 USD

7. Social Responsibility
70
• Improves overall energy efficiency for
water utility 60
• Improved water conservation
50
• Releasing the Energy from existing
water assets 40
• No visual pollution
• Lower cost than most alternative 30
energy sources
20
• Utilize existing competence in water
utility
10
• Graph: Cost comparision renewable 0
energy – Source: EIA
Variable O&M
Fixed O&M
Total overnight cost

8. Technology

9. Pressure – the “forgotten” energy source
• Two ways of reducing pressure:
– Discharge to open basin
– Conversion to kinetic energy and back again
(pressure reduction valve)
• Common for both types – energy from pressure drop is lost!
• A third method is to control the pressure with a rotating barrier
device, which is harvesting the energy from the pressure drop
converting it to electricity
Pressure Pressure Power Feed-in
reduc- & leak produc- tariffs/
tion mgmt tion CRC’s
Manual PRV X
Remote ctr. PRV X X
difgen X X X X

10. Difgen pressure reduction
• Volumetric displacement turbine - impellers form a physical,
rotating barrier between the upstream and downstream fluids
• A fixed volume is dosed through the turbine for each revolution
• By applying load, rotational speed is retarded, and a differential
pressure is created
• By dynamically controlling the generator speed, the
upstream/downstream pressure is also dynamically controlled
• The load is an electric generator, converting work to electricity
Impellers acting
as barriers are
functionally
comparable with
mechanical
transmissions

11. Pressure management & Grid Connection
• Pressure set point from
SCADA/DCS
• Variable speed by dual
front-end frequency drives
• Parallel turbines controlled
by one controller
• Connected to the grid in the
same way as wind turbines
– Always connected
– Dual front-end VFD’s to
transform from generator
voltage and frequency to
grid voltage and frequency
– Production determined by
available flow/pressure

12. Micro-power from existing infrastructure
• Capex $2.0-2.5/W
• Opex $0.015/kWh
• Californian small
hydro power potential
is 1,927 MW 1
realizing energy value
of approx USD1.6 bill.
per year
1. California Small Hydropower and Ocean Wave Energy Resources, Mike Kane, California Energy Commission, CEC-500-2005-
074, April 2005

13. Quote Pilot Customer
“…it functions better than an ordinary valve. It adjusts very quickly to the
set down stream pressure, and we avoid problems with water hammer
like we experience with standard pressure reduction valves”,
Jone Bakke, VP of Water in I.V.A.R. Water and Sewage Company in
Norway.

14. Summary
• Unique patented technology
• Enable power production within existing infrastructure
• Short payback
• First installation in US expected May 2010

15. Pure power from fluid pressures
www.zeropex.com