2 Headends and Hubs Copyright 2010 The

Photovoltaic Power System for DC loads Extra High Efficiency Photovoltaic Power System “PVPS” • PVPS is a solar/power bay system that supplies DC power directly to the battery bank and DC load. • Grid-tied, but continues to provide power in the event of an outage. • Fully integrated. • Ready for rapid deployment. • Ideal for critical loads Copyright © 2010 The Alpha Group. All Rights Reserved.

Hybrid Power Systems - “HPS” Hybrid Power System “HPS” • For maximum power reliability, incorporates: • Solar • Battery • And/or generator • And/or wind turbine • Designed for larger loads providing DC and/or AC output • Custom Engineering Copyright © 2010 The Alpha Group. All Rights Reserved. Customer AC Loads PV Array Customer DC Loads Wind Turbine(s) Generator(s) Alpha Group DC Power Plant: Charge Controller, Cordex (Rectifier and Inverter optional) Battery Bank

Case Study: Leading European MSO • Purchased over 300 kw of PV power from Alpha – 80% went into Office installations • Corporate and Sales – 18% went into Headend and Hub site locations but using AC grid tie power to take advantage of high European feed in tariffs – 2% Experimented with low load network powering locations. Was very hard to impossible to find locations to make this happen Copyright © 2010 The Alpha Group. All Rights Reserved.

3) Network Copyright © 2010 The Alpha Group. All Rights Reserved.

Applying solar down in the network • To go fully off grid: – Pricey: $18, 000+ to go full off grid and not connect to the utility, Difficult to find enough space, rights of way – Vulnerable to theft – Lots of batteries • Can be used to defer power costs – Can start to shed load for 1500$ on up – Projects in europe with one or four panels and a small charge controller • Panel installation permissions were the biggest issue • Can have a decent payback Copyright © 2010 The Alpha Group. All Rights Reserved.

Hybrid Cable. UPS in a Fibernode Power Enclosure (FPE) Nodes Copyright © 2010 The

Copyright © 2010 The Alpha Group. All Rights Reserved.

Case Study: Remote Cell or Microwave sites: Sierra Vista, AZ Cell Repeater • The Choices: – High Capital Cost • Contract with the utility to install distribution – High O&M Cost • LP Generator with regular maintenance – Best Life Cycle Cost • Solar power system with generator backup • Alpha’s HPS arrives at the site fully tested and ready for deployment. Copyright © 2010 The Alpha Group. All Rights Reserved.

Case Study: Low power transmission sites: Cisco Wireless Mobility Alpha Technologies Model number MPS 30 -48 CSL is a 48 VDC Uninterruptible Power Supply Supporting Cisco Aironet 1500 radios for Outdoor Mesh Networks Copyright © 2010 The Alpha Group. All Rights Reserved.

Payback Analyses for a Photovoltaic Power System in the Caribbean Copyright © 2010 The

System Description • • $100, 000 USD Estimated Upfront Cost for a 26. 0 k. W Alpha PVPS Roof-Mount Racking; PV Array Tilted at a 10° Angle due South Produces ~50, 000 k. Whs annually Installation, taxes, and shipping charges not included in estimated cost Copyright © 2010 The Alpha Group. All Rights Reserved.

Exception and Clarifications on Study Ø Weather data used in analysis was from Aruba. Ø Used various electricity rates in $0. 10 increments, with an annual 4. 0% cost /k. Wh escalation. Ø Assumed system would be installed at the beginning of the year. Ø Output degradation from the modules was estimated to be 0. 5% annually. Ø NPV was calculated with a 7. 0% discount rate over 20 years. Ø IRR was calculated over 20 years. Ø Following graphs show simple payback (revenue and costs per year) pre-taxed. Does not take inflation into account. Ø No costs due to taxes, shipping, installation or maintenance were included in analysis. Copyright © 2010 The Alpha Group. All Rights Reserved.