Energy Storage Site (ESS)
An Energy Storage Site in Bazefield represents a collection of Power Conversion Systems (PCSs) and supporting balance of plant equipment grouped under a single entity. It can be modeled as a stand-alone ESS under its own physical site, as PV-connected storage sharing a physical site with a Solar Farm asset, or even as connected storage to a Wind Farm. Each ESS is uniquely identified and linked to sub-assets including PCS units, battery containers, battery racks, and meters, forming the energy storage asset hierarchy.
Functional Description
An Energy Storage Site (also known as a Battery Energy Storage System or BESS) is a facility designed to store electrical energy and dispatch it to the grid or local loads as needed. This is achieved through a coordinated array of battery modules, power conversion systems (PCS), and energy management systems (EMS). The PCS units convert AC grid or attached renewable plant power to DC power for battery charging, and vice versa for discharging. The combined output is typically aggregated at an on-site substation and fed into the electrical transmission grid via a single point of interconnection (POI).
In Bazefield, the Energy Storage Site object type represents this entire power-storing entity — enabling monitoring, control, and reporting at the plant level. It serves as the top-level structure for aggregating PCS-level data, managing grid-level compliance, and analyzing overall site performance.
Logical Site
An energy storage site asset type is specifically a Logical Site.
In Bazefield, the concept of a site is split into two layers — Physical Site and Logical Site — to provide accurate modeling of complex facilities that host multiple grid-connected systems. A Logical Site represents a distinct operational unit within a physical facility, usually aligned with a single point of interconnection (POI) to the electrical grid. It includes the set of assets (e.g., PCS units, battery racks, meters) and control boundaries responsible for storing or dispatching power under a specific market registration, utility agreement, or revenue stream.
A Physical Site represents the shared physical facility or location where power generating or storing assets are installed. This includes common infrastructure such as access roads, fencing, communications equipment, and substations. A physical site typically maps to a real-world geographic footprint and can encompass multiple independent or dependent logical sites.
An example of how to use physical site asset types and logical site asset types together in modelling is shown below. Here, an Energy Storage Site attached to a large solar site is modelled as Solar & Storage Facility, with logical Energy Storage Site Attached ESS and solar site Solar Farm 2 as children.
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A solar facility with attached storage modelled using Physical and Logical sites.
Core Data Model
While the data model of energy storage systems may vary by vendor and configuration, Bazefield offers a pre-installed CORE data model to account for the most common points, events, and attributes relevant to all ESS setups. Model-by-model variations are then handled through smart Model Inheritance.
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Example of a common modeling strategy to encompass variations of data between OEMs and site-specific SCADA configurations at the plant level.
Core Attributes
Attributes are fixed key-value pairs used to represent non-time series data associated with each asset (read more about Attributes). While attribute values can differ from asset to asset, critical shared (i.e., CORE) attributes defining the Energy Storage Site asset type, pre-installed in Bazefield, are described below. These are often prerequisite data required for Bazefield applications to function fully.
Required for basic Bazefield Core functionality
Optional attributes for common additional modelling
Attributes marked with “** “ are only applicable to North American clients with wind farms requiring to submit GADS Performance and Event reporting.
Depending on your version of Bazefield, there may be additional advanced attributes not listed here to support data integrations or migrations with other systems.
Attribute | Key | Description | |
|---|---|---|---|
Capacity (MW DC) | capacity | The total capacity of all components on the DC side. |
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Latitude | latitude | The latitude of the power plant. |
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Longitude | longitude | The longitude of the power plant. |
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Time Zone | timeZone | Select this site local time zone. |
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Number of Power Conversion Systems | enabledPcs | Number of PCSs for this site. This is used in calculations and applications to represent the number of assets. |
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Meter Asset Pattern | meterAssetPattern | Pattern to identify Meter objects to be summed in farm rollups. Wildcards: ? = 1 character; % = 0+ characters. Ex. "OCM%" |
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Total Number of Battery Racks | numRacks | Total number of racks/strings installed for the site |
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Number of Battery Containers | enabledContainers | Number of Battery Containers for this site. This is used in calculations and applications to represent the number of assets. |
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Nominal Plant Capacity (MW AC) | nominalPlantCapacity | Enter the maximum authorized plant production at the point of interconnection if limited by a plant controller. If not limited, leave empty. |
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PPA Rate (Unit/MWh) | ppaRate | Used to calculate the revenue. Revenue = production x unit price of electricity. The default value is 0.88 if this field is left blank. |
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Certified Product Templates
This section lists the common, shared point, event, and other data templates applicable to an Energy Storage Site asset type pre-installed by the Bazefield product team. For Bazefield customers, more details for each template are available per object type in the Certified Product Templates section.
Contains points/events required for Bazefield Core Dashboard functionality
Optional templates for common additional data streams/sources
Template Type | Name | Description | |
|---|---|---|---|
Point Template | Core Real-Time Data | ESS Calculations summarizing PCS, Container, and Meter values | |
Point Template | Core Calculations | Standard ESS Calculations for PCS & Container summary and simple budget data. | |
Point Template | Core Monitoring KPIs | Standard ESS analytics for production and performance data | |
Point Template | Core Market Data | Standard data streams for energy pricing and market data. |