![]() This project aims to extend on those prior capabilities in two key dimensions. Methods and software have been developed to solve this problem, finding optimal solutions which take simultaneity into account. Past studies have considered combined heat and power (CHP) technologies. Given end-use energy details for a facility, a description of its economic environment and a menu of available equipment, DER-CAM finds the optimal investment portfolio and its operating schedule which together minimize the cost of meeting site service, e.g., cooling, heating, requirements. In past work, Berkeley Lab has developed the Distributed Energy Resources Customer Adoption Model (DER-CAM). DER-CAM is used to assess the existing and proposed DER equipment in its ability to reduce tariff charges. This paper reports an analysis of the historic performance of the PV system and fuel cell, describes the complex optimization applied to the battery scheduling, and shows how results will affect the jail's operational costs, energy consumption, and carbon footprint. The Distributed Energy Resources Customer Adoption Model (DER-CAM) finds true optimal combinations of equipment and operating schedules for microgrids that minimize energy bills and/or carbon emissions without 2 of 12 significant searching or rules-of-thumb prioritization, such as"efficiency first then on-site generation." The results often recommend complex systems, and sensitivities show how policy changes will affect choices. This ongoing effort by a progressive local government with considerable Federal and State support provides some excellent more » lessons for the struggle to lower building carbon footprint. A current US$14 M expansion will add approximately 2 MW of NaS batteries, and undetermined wind capacity and a concentrating solar thermal system. Often described as a green prison, it has a considerable installed base of distributed energy resources including a seven-year old 1.2 MW PV array, a four-year old 1 MW fuel cell with heat recovery, and efficiency investments. « lessĪ large project is underway at Alameda County's twenty-year old 45 ha 4,000-inmate Santa Rita Jail, about 70 km east of San Francisco. This enables the battery to maintain energy balance using droops without need for a fast control system. The battery’s electronics includes Consortium for Electric Reliability Technology (CERTS) Microgrid technology. ![]() it is a locally controlled system, and it can operate both grid connected and islanded. In other words, the Santa Rita Jail is a true microgrid, or μgrid, because it fills both requirements, i.e. During grid blackouts, or when conditions favor it, the Jail can now disconnect from the grid and more » operate as an island, using the on-site resources described together with its back-up diesel generators. A current US$14 M expansion adds a 2 MW-4 MWh Li-ion battery, a static disconnect switch, and various controls upgrades. Often described as a green prison, it has a considerable installed base of distributed energy resources (DER) including an eight-year old 1.2 MW PV array, a five-year old 1 MW fuel cell with heat recovery, and considerable efficiency investments. Also presented here are overviews of the DER currently installed at the jail, as well as the value it provides by offsetting the purchase of electricity under the current Pacific Gas& Electric (PG&E) = ,Ī large microgrid project is nearing completion at Alameda County’s twenty-two-year-old 45 ha 4,000-inmate Santa Rita Jail, about 70 km east of San Francisco. The extent to which that jail is capable of islanding is principally dependant on the energy capacity of the battery-one focus of this investigation. Consequently, the jail will be able to seamlessly disconnect from the grid and operate as an island in the event of a disturbance, reconnecting again once the disturbance has dissipated. With the upcoming installation of a large-scale battery and fast static disconnect switch, Santa Rita Jail will become a true microgrid, with full CERTS Microgrid functionality. These include a 1.2MW rated rooftop PV system installed in 2002, a 1MW molten carbonate fuel cell with CHP, and retrofits to lighting and HVAC systems to reduce peak loads. ![]() ![]() Over the past decade, a series of Distributed Energy Resources (DER) installations and efficiency measures have been undertaken to transform the 3MW facility into a"Green Jail". Santa Rita Jail is a 4,500 inmate facility located in Dublin CA, approximately 40 miles (65 km) east of San Francisco.
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