©2009. Northern Power Systems. All Rights Reserved. Not to be used or shared without permission. Proprietary and Confidential.

A New Isolated Grid Paradigm;

All Renewables-----No Diesel

Brett Pingree, VP America’sNorthern Power SystemsMarch 9th, 2011

©2009. Northern Power Systems. All Rights Reserved. Not to be used or shared without permission. Proprietary and Confidential.

Agenda

Why No Diesel?

Similarities to Isolated Arctic Grid Projects

Overview of Project

What Does the All RE Model Look Like?

Project Details

Challenges to Project

©2009. Northern Power Systems. All Rights Reserved. Not to be used or shared without permission. Proprietary and Confidential.

Why No Diesel?

Hedge Against Rising Costs (and Procurement) of Diesel Acquisition

Limited Hazardous Waste Impact

Reduced Acoustic Impact

Save on Fuel Storage Costs

Significantly Increase Safety

Make a Green Statement (Marketing)

©2009. Northern Power Systems. All Rights Reserved. Not to be used or shared without permission. Proprietary and Confidential.

Similarities to AK Isolated Grid Projects

Expensive Diesel!!

Difficult Access to Sites

Cranes, Heavy Equipment, and Skilled Labor

Weather (Hurricanes and Extreme Heat)

Weak Grid, Intermittent Power

Permitting and Fish/Wildlife (Iguanas and Parrots)

Soil challenges (Coral)

Salt Corrosion

Sharks instead of Bears

©2009. Northern Power Systems. All Rights Reserved. Not to be used or shared without permission. Proprietary and Confidential.

All Renewable Bahamian Resort2 Parallel 300 kVA Static Power Invertors

5 Proven’s 15kW

2 Northern Power 100kw

4 PV arrays of 308 Panels (65kW dc) each [260 Kw total]

3 x 250kW Backup CAT Diesels

2.16 MW-Hr Battery Storage System

• 3 Battery Banks 360Vdc (180 cells (2000AHr) each)

Associated DC and AC switching

On-line June 2011

Expects to be the First 100% All Renewable Energy

Destination Resort

©2009. Northern Power Systems. All Rights Reserved. Not to be used or shared without permission. Proprietary and Confidential.

©2009. Northern Power Systems. All Rights Reserved. Not to be used or shared without permission. Proprietary and Confidential.

Additional Project Details

Wide Connected Load Range: ~75kW (min.) – ~300kw (Peak) expected

Daily Average Loads: 1,800 – 3,000 kw-Hr/day

 

Inverter-Based PV/Wind Grid

• Inverters provide system frequency & voltage reference • Very fast response to load change• Efficient energy conversion thru wide load range• Bi-directional Inverter/Charger to manage battery bank SOC• Higher degree of WTG penetration than traditional WD/diesel grid

©2009. Northern Power Systems. All Rights Reserved. Not to be used or shared without permission. Proprietary and Confidential.

Challenges to ProjectGrid Impedance May Be Higher Than Typical Diesel Grid

Final System Optimization May Require Turbine Control Adjustments

Dispatch Coordination Between Inverters & WTG Critical to Performance Stability

120 Ton Installation Crane delivery and Concrete dispatch

Unique advanced system configuration

Island time, expect the unexpected

Battery Life and Cost to Maintain

Hurricanes

©2009. Northern Power Systems. All Rights Reserved. Not to be used or shared without permission. Proprietary and Confidential.

Promote Creative Solutions to Get Us Off Fossil Fuels!

Higher Degree of Penetration (diesel offset) Possible

Common DC Bus Supports Separate Inverter Sources for Redundancy

• Split Power System- Balancing Different Feeds from Same Source  

Verified Inverter-Based System

Inverter Will Control Frequency & Voltage  

W-D Control Integration Similar to Diesel Integration

No Fossil Fuels!