The idea of an energy storage tolling agreement is derived from the concept of a gas tolling agreement (which is defined further down in this article). In an energy storage tolling agreement, the seller develops, owns, and operates the energy storage system, while the offtaker supplies charging energy. Therefore, the. Under an energy storage tolling agreement, the developer of the energy storage system is responsible for obtaining site control, permits, interconnection rights, equipment, and construction contracts, as well as achieving agreed-upon milestones such as a. Below you can download two sample battery & energy storage tolling agreements—an Energy Storage Facility Agreement fromOntario ISO and an Energy Storage System Power Purchase Tolling Agreement from San Diego Gas & Electric Company. Click. In an energy storagetolling agreement, there are a number of potential payments and measures of performance. Some of these variables include: 1. Payments 2. Performance A tolling agreement is a contract which allows for the rental of a power plant from its owners. Tolling agreements give the renter the ability to convert one physical commodity (fuel/gas) into.