Scottish Water Horizons

Delivering innovation in the Hydro Nation

Fraser Purves

Commercial Manager

Who are Scottish Water Horizons

An overview…

• Owned by Scottish Water

• Self funded

• Leveraging value of Scottish Water assets

• Identifying commercial opportunities

• Contributing to Scottish Water’s renewable objectives

• Supporting Scotland’s growth agenda

What we do…

The energy challenges

The scale of the challenge currently being

faced by SW:

• Largest energy consumer within Scotland

• £40m per annum energy bill

• Reducing SW’s carbon footprint

The Scottish Water Vision…

Horizons hydro programme

• The hydro potential

• SWH hydro investment into the asset

• SWH hydro programme

• A crucial part of the SWH programme is the Difgen… a new turbine technology

What is a Difgen?

An alternative turbine technology

• A water turbine that combines:

Pressure reduction + flow control Power generation by harvesting the

energy from the resulting pressure drop

• Installed within potable water distribution networks

• The Difgen concept was developed by Zeropex

The Difgen turbine… what it looks like

Hydro power from fluid pressure

The heart of the Difgen… the techy bit

• A positive displacement rotary lobe pump running in reverse to act as a turbine

• How does it work?

Differential pressure created by the braking force load applied from the grid

Retards the rotational speed

Allows either flow or pressure control

Denny Difgen… a first in Scotland

The facts

• In line between Carron Valley WTW to Quarter BPT

• 2 No. Duty models installed with an output of 100kW

• Energy produced; 600 MWh per annum… enough to power 150 homes

• Investment at £800k

• Return on investment Annual income estimated at £147k Anticipated payback of 6 years

Denny Difgen… a first in Scotland

What are the benefits?

• The asset base can be fully exploited for renewable energy

• The scale of the Difgen opportunity... 3,500 PRVs in SW asset base

• Pan Scotland Difgen programme kicked off with first 20 sites… estimated to produce 15,000MWh… enough to power 4,000 houses

• Benefits to SW and our customers

Closing thoughts… a positive contribution to generating green energy

Finally, I want to leave you with these key messages:

• The Difgen technology supports SW vision of becoming a low carbon water company

• The Difgen is an enabler for: Smart leakage management Reducing carbon footprint Ultimately reducing the electricity bill

Thank you