An example of basic AA between bonneville Power Administration and a wind turbine was developed as a reference for future AOPs.  Solar PPAs are now being successfully used in the California Solar Initiative`s Multifamily Affordable Solar Housing (MASH) program.  This aspect of the success of the CSI program has just been opened to applications. System hosts can choose to sell the ICs related to the solar photovoltaic installation on site and to buy, instead of their organization, ICRs from other geographically eligible green electricity resources, in order to assert environmental requirements. This process is called rec-arbitration and allows the host to enjoy the financial benefits of solar ICs while asserting environmental requirements and meeting the requirements of the partnership. For an in-depth discussion of RECs, see the EPO White Paper on RECs. A power purchase agreement is a kind of TPO (Third-Party Ownership) financing model in which there is a two-party contract. For a more detailed analysis of the problems associated with IPRs of this type, see the IFC Guide on Electricity Capture Contracts (1996) – see Annex 2 (page 160) of the World Bank Concessions Toolkit (pdf). Solarize Philly attendees discuss their available options for solar energy. An electricity purchase agreement (ECA) or electricity contract is a contract between two parties, one who produces electricity (the seller) and the other who wishes to purchase electricity (the buyer). The ECA sets out all commercial terms of sale of electricity between the two parties, including the date the project will begin to operate commercially, the schedule for the supply of electricity, delivery penalties, terms of payment and termination.