(1) "MW Deployed" represents the megawatt production capacity of solar energy systems that have had all required building department inspections completed during the applicable period. This metric includes solar energy systems deployed under Energy Contracts as well as solar energy system direct sales.

(2) "Backlog" represents the aggregate megawatt capacity of solar energy systems not yet deployed as of the date specified pursuant to Energy Contracts and contracts for solar energy system direct sales executed as of such date.

(3) "Customers" includes all residential, commercial and government buildings where we have installed or contracted to install a solar energy system, or performed or contracted to perform an energy efficiency evaluation or other energy efficiency services.

(4) "Energy Contracts" includes all residential, commercial and government leases and power purchase agreements pursuant to which consumers use or will use energy generated by a solar energy system that we have installed or contracted to install. For landlord-tenant structures in which we contract with the landlord or development company, we include each residence as an individual contract. For commercial customers with multiple locations, each location is deemed a contract if we maintain a separate contract for that location.

(5) "Nominal Contracted Payments Remaining" equals the sum of cash payments obligated to be paid to us under our Energy Contracts over the remaining term of such contracts. This metric includes Energy Contracts for solar energy systems already deployed and in Backlog. As an example, if a customer is 2 years into her 20 year contract, then 18 years of contract payments remain. As an additional example, if a customer chose to pre-pay her Energy Contract, then it is included in Nominal Contracted Payments Remaining only while it is in Backlog as the pre-payment has not been received. Payments for direct sales are not included. The estimated nominal contracted payment remaining as of December 31, 2012 of $1.109 billion is presented as corrected from the $1.091 billion previously reported and included in our annual report on Form 10-K.
CONTACT: Investor Contact         Aaron Chew         investors@solarcity.com

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