Project Details:Top

Utility Name:	Arizona Public Service
Utility Type:	IOU
Funding Source(s):	System Benefit Charge
State:	Arizona | AZ
Region:	West
Utility Program(s):	Off-Grid Applications (communications, lighting, pumping, etc)
Technology:	PV

Project Description:Top

For almost two decades, Arizona Public Service (APS) designed and installed PV-diesel hybrid power systems as an alternative to making long uneconomical line-extensions. In 1985, APS installed its first system on Carol Spring Mountain. Its last system was installed at Grey Wolf Landfill in August 2002.

APS was in charge of the design and acquiring the equipment for the systems and the installers handled the procurement, installation and maintenance. APS owns all the equipment. In total, twelve 50kW systems were installed. Equipment costs were not rate-based but paid for by funds collected from Arizona`s Environmental Portfolio Standard surcharge.

These turn-key hybrid power systems provide an alternative to line extensions in remote areas benefitting the utility. In turn this solution proved to be a lower-cost option for the customers as well, as line extension can be costly.

APS discontinued this program because maintenance of the hybrid system became too expensive. In some cases equipment was not taken care of properly or vandalized. Meanwhile, the utility has sold ten of the systems to customers and is looking to sell the remaining two.

Today, APS is offering its 'off-grid' PV rebate as an alternative. Homes and businesses in APS` service area, but not served by the utility, can apply for and receive an incentive of $2/watt-dc to install a non-grid connected PV system. APS receives all Renewable Energy Credits (RECs) generated by the systems.

Project Links:Top

General Project Description: http://www.aps.com/my_community/Solar/Solar_53.html

Grey Wolf Landfill hybrid system: http://www.battcon.com/PapersFinal2003/CanadaPaperFINAL2003.pdf

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