Hosting Capacity Map

Welcome to Indiana Michigan Power's hosting capacity map. The map is designed to help contractors and developers find potential locations for private distributed energy resources (DERs), which may include new load (such as electric vehicle chargers) or new generation (such as solar or wind installations). Only Michigan is mapped at this time.

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Frequently Asked Questions

What is hosting capacity?

Hosting Capacity Analysis (HCA) is the process of assessing the amount of new load or distributed generation that can be accommodated by the existing distribution system without requiring system enhancements or mitigations (such as infrastructure upgrades or equipment settings changes).

What factors can limit Hosting Capacity?

AEP considers the following system constraints when calculating hosting capacity:

• Thermal loading
• Abnormal Voltages (voltages outside of 117V - 126V)
• Voltage Variations (changes in voltage >= 3% from the baseline voltage condition)

Please note that a more comprehensive and complete analysis is performed as part of an interconnection request review and additional constraints such as reverse power flow, flicker, overcurrent protection, etc. may further limit the available capacity at a location beyond the hosting capacity analysis results shown in the map.

How is hosting capacity calculated?

Hosting capacity is calculated iteratively at each node within the distribution circuit. A load flow analysis is performed on a model of the existing circuit to establish a baseline. The load or generation is then increased at each node and a load flow analysis is performed after each increase until any of the constraints are violated. Once a violation occurs, the hosting capacity analysis completes for that node and the process is repeated until every node within the distribution system has been analyzed. The results, including the maximum hosting capacity value (KW) and the limiting constraint are output and displayed within the map.

Analysis Assumptions and Limits:

• Only DER less than or equal to 7,500 kW is evaluated
• Only DER greater than or equal to 150 kW is evaluated
• All simulated DER capacity (both generation and load) is assumed to have a fixed power factor of 100%
• Hosting capacity analysis is performed on all nodes that have three-phase conductor/cable
• All simulated DER capacity is assumed to be split equally (balanced) among the available phases

How frequently is the map updated?

The hosting capacity data displayed within the map is refreshed for each circuit on an annual basis. Each individual circuit may have its data refreshed on a different date. Users can review the refresh date for an area or circuit by selecting an individual shape within the map and reviewing the shape summary details.

How do I use the map?

After accessing the map, use the legend/color coding to quickly identify available hosting capacity in an area. For more detailed results, zoom in and select an individual shape to review available hosting capacity (kW), voltage, phasing and more. Users can toggle the display to see the available hosting capacity from both a "Load" and "Generation" perspective.

What data is available?

Attribute	Attribute Definition	Example
Grid ID:	A unique identifier for the selected area in the map.	EGY-195
Area Description:	An approximate address or general description of the area covered by the selected grid.	123 W. Main St., Detroit, Michigan 12345
Operating Company:	The Operating Company name.	INDIANA MICHIGAN POWER COMPANY
Station Name:	The station name.	BUCHANAN SOUTH
Circuit ID:	A unique identifier for the selected circuit.	4096821
Circuit Voltage Class:	The voltage class for the selected grid/circuit. Data displayed in kilovolts (kV).	12.00 kV
Location Voltage:	The voltage of the location on the selected grid/circuit. Data displayed in kilovolts (kV).	12.00 kV
Phasing:	The phasing of the location on the selected grid/circuit.	ABC
Wire Size and Type:	The wire size and wire type of the location on the selected grid/circuit. Ex: #2 wire size, AA = Aluminum Alloy conductor, BARE = no insulation	2 AA BARE
Hosting Capacity:	The maximum hosting capacity available within the selected grid. Data displayed in kilowatts (kW).	1505.90 kW
Limiting Constraint (Coming soon):	The constraint that is limiting the maximum hosting capacity in the selected grid.	Thermal Loading
Circuit DER in Queue:	The amount of DER currently in queue for the respective grid/circuit. Data displayed in kilowatts (kW).	110.5 kW
Circuit Rating:	The total power rating for the respective circuit. Data displayed in megavolt-amperes (MVA), which is the total power rating (including real and reactive components).	15.77 MVA
Circuit Transformer Rating:	The total power rating for the circuit transformer. Data displayed in megavolt-amperes (MVA), which is the total power rating (including real and reactive components).	22.40 MVA
Hosting Capacity Refresh Date (EST):	The date/time that the hosting capacity rating (kW) was last refreshed for the selected grid/circuit.  Data displayed in Eastern Standard Time (EST). Note that this date will vary by grid/circuit.	11-07-2023-04:24
Circuit DER Data Refresh Date (EST):	The date that the queued DER data (kW) was last refreshed for the selected grid/circuit.  Data displayed in Eastern Standard Time (EST). Note that this date will vary by grid/circuit.	06-20-24-03:03

Disclaimer

The HCA results displayed within the map should be used for preliminary review purposes only and the maps do not replace the existing new load request or DER interconnection application processes. The hosting capacity data displayed within the map is taken from a previous point in time and does not necessarily reflect current system conditions. After a new load or DER interconnection application has been submitted, a more complete engineering review and analysis will occur which may limit or expand the amount of load/DER that can be connected (hosted) at a particular location.