Vehicle-to-Grid Electrical Systems in Indiana
Vehicle-to-grid (V2G) technology enables bidirectional power flow between electric vehicles and the electrical grid, transforming parked EVs into distributed energy resources. This page covers the electrical infrastructure requirements, applicable standards, permitting concepts, and decision boundaries that govern V2G installations in Indiana. Understanding V2G is increasingly relevant as Indiana utilities expand demand-response programs and as EV adoption in the state grows beyond simple charging scenarios.
Definition and scope
Vehicle-to-grid (V2G) is a power electronics architecture in which an EV battery can both receive energy from the grid (charging) and export energy back to the grid or a building (discharging). The distinguishing characteristic is bidirectionality: unlike standard Level 1 or Level 2 EVSE, a V2G-capable system requires inverter hardware that can synchronize exported alternating current with the utility grid's frequency and phase.
V2G is classified as a subset of distributed energy resource (DER) interconnection under IEEE Standard 1547-2018, which governs technical requirements for interconnecting distributed energy resources with electric power systems. Within the broader conceptual overview of Indiana electrical systems, V2G occupies the intersection of EV infrastructure and DER regulation — a space that triggers both National Electrical Code (NEC) compliance requirements and utility interconnection rules.
Scope of this page: This page addresses V2G electrical systems installed in Indiana. Coverage includes residential, commercial, and fleet contexts within Indiana state jurisdiction. It does not address federal-level utility regulation by the Federal Energy Regulatory Commission (FERC) beyond noting where FERC authority intersects state rules. It does not cover Vehicle-to-Home (V2H) or Vehicle-to-Load (V2L) systems operating in island mode as standalone generators, except where their electrical infrastructure overlaps with grid-connected V2G. Adjacent topics such as battery storage and EV charging integration in Indiana and solar integration with EV chargers in Indiana are addressed on separate reference pages.
How it works
A V2G system operates through five discrete functional layers:
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Bidirectional EVSE hardware — The charging station (EVSE) must include a bidirectional inverter or support an on-board vehicle inverter capable of exporting AC power. Standard SAE J1772 connectors support only unidirectional flow; V2G-capable installations in the United States commonly use CHAdeMO protocol or the emerging ISO 15118-20 standard, which defines bidirectional power transfer ("Plug and Charge" with V2G capability).
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Vehicle-side power electronics — The EV must have a bidirectional on-board charger (OBC) or support DC-coupled V2G via CHAdeMO. Not all EVs are V2G-capable; as of the 2023 model year, Nissan (CHAdeMO) and Ford (Intelligent Backup Power via the F-150 Lightning, using a proprietary inverter) represent the primary V2G-capable platforms sold in the United States (U.S. Department of Energy, Alternative Fuels Data Center).
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Inverter synchronization — Exported power must be synchronized to the utility grid at 60 Hz and within the voltage tolerances specified in IEEE 1547-2018. This requires anti-islanding protection — automatic disconnection if the grid loses power — to prevent energizing utility lines during outages and endangering line workers.
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Utility interconnection agreement — In Indiana, utility interconnection for DERs including V2G systems is governed by each investor-owned utility's interconnection tariff, which must comply with the Indiana Utility Regulatory Commission (IURC) rules. Duke Energy Indiana, Indiana Michigan Power, and Vectren (now CenterPoint Energy Indiana) each maintain separate interconnection processes subject to IURC oversight (Indiana Utility Regulatory Commission).
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Metering and communication — V2G systems require interval metering capable of recording bidirectional flow. Smart meter compatibility and time-of-use rate structures are prerequisites for economically viable V2G operation. The Indiana utility interconnection for EV charging page details the technical interconnection requirements specific to EV infrastructure.
From a wiring standpoint, the NEC Article 625 governs EVSE installations, and NEC Article 705 governs interconnected electric power production sources — both articles apply simultaneously to a grid-connected V2G installation. Indiana's currently adopted NEC edition establishes the baseline; jurisdictions such as Indianapolis that have adopted the 2020 NEC apply updated Article 625 provisions that more explicitly address bidirectional equipment.
Common scenarios
Residential V2G with a bidirectional EVSE
A homeowner with a V2G-capable EV (e.g., a Ford F-150 Lightning using Ford's 80-amp Charge Station Pro) installs a dedicated 240V, 100-amp circuit to support bidirectional power flow. The installation requires a permit, a licensed electrician under Indiana's EC-6 electrical contractor licensing structure administered by the Indiana Professional Licensing Agency, and utility notification. A panel upgrade for EV charging in Indiana is frequently necessary at the service entrance to accommodate the additional load and bidirectional metering hardware.
Commercial fleet V2G
A commercial fleet operator installs V2G-capable charging infrastructure across 20 vehicles. At this scale, the installation falls under commercial electrical design requirements, load management systems, and potentially a demand-response contract with the serving utility. The fleet EV charging electrical considerations in Indiana page addresses the commercial-scale framing. Utility interconnection at this capacity typically requires a formal application and engineering review.
Workplace or campus microgrid integration
V2G systems integrated into workplace charging infrastructure can participate in campus-level microgrid operation. These systems must comply with both NEC Article 705 and NFPA 70E arc-flash safety requirements during maintenance. The workplace EV charging electrical infrastructure in Indiana page covers employer-side installation frameworks.
Decision boundaries
V2G vs. V2H vs. V2L — classification matters for permitting
| Feature | V2G | V2H (Vehicle-to-Home) | V2L (Vehicle-to-Load) |
|---|---|---|---|
| Grid connection | Yes — bidirectional | No — islanded from grid | No — portable loads only |
| NEC Article 705 applies | Yes | No (but transfer switch rules apply) | No |
| Utility interconnection required | Yes | No | No |
| Anti-islanding required | Yes | Transfer switch isolation required | No |
| Indiana IURC filing required | Yes (for DER >10 kW) | No | No |
This classification boundary is operationally significant: a V2H system operating behind a properly installed transfer switch does not require a utility interconnection agreement, while a V2G system exporting to the grid always does, regardless of export capacity.
Permitting triggers in Indiana
Any new circuit, panel modification, or service entrance change associated with a V2G installation requires an electrical permit from the local authority having jurisdiction (AHJ). Indiana's permitting framework — administered at the county and municipal level under state oversight by the Indiana Fire Prevention and Building Safety Commission — requires inspection before energization. The EV charger electrical inspection in Indiana page describes the inspection lifecycle applicable to EVSE and associated DER infrastructure.
Licensing requirements
V2G installations involve work that exceeds simple EVSE installation. Indiana requires a licensed electrical contractor (EC-6) for work on services, feeders, and interconnected power systems. The licensed electrician requirements for EV chargers in Indiana page details scope-of-work boundaries under Indiana's licensing structure.
Safety standards boundary
IEEE 1547-2018 mandates specific voltage and frequency ride-through requirements, reactive power capability, and anti-islanding performance. UL 9741 is the product safety standard for bidirectional EVSE, and listed equipment meeting UL 9741 is the baseline for AHJ acceptance. Installations not using listed equipment face additional engineering review. For grounding and bonding specifics applicable to any EVSE installation including V2G, the EV charger grounding and bonding in Indiana page provides the relevant NEC-grounded framework.
For a broader orientation to the regulatory landscape governing EV and electrical infrastructure in Indiana, the regulatory context for Indiana electrical systems page consolidates the applicable agency authorities and code adoption status. The full site index of Indiana EV charger electrical topics is available at the Indiana EV Charger Authority home.
References
- IEEE Standard 1547-2018 — Interconnection and Interoperability of Distributed Energy Resources with Associated Electric Power Systems Interfaces
- Indiana Utility Regulatory Commission (IURC)
- Indiana Professional Licensing Agency — Electrical Contractors
- Indiana Fire Prevention and Building Safety Commission
- U.S. Department of Energy, Alternative Fuels Data Center — Vehicle-to-Grid
- National Electrical Code (NEC) — NFPA 70, Articles 625 and 705
- [UL 9