Types of Maryland Solar Energy Systems

Maryland property owners, businesses, and utilities encounter a structured set of solar energy system categories defined by grid connection, ownership model, scale, and application. Understanding these classifications matters because each type carries distinct permitting pathways, interconnection requirements under Maryland Public Service Commission rules, and eligibility for state incentive programs. This page maps the primary system types recognized in Maryland, defines their technical and regulatory boundaries, and identifies where categories intersect or create decision complexity.

Jurisdictional Types

Maryland solar energy systems are regulated at three overlapping levels: state, local, and federal. The Maryland Public Service Commission (PSC) holds primary authority over utility interconnection standards and net metering eligibility under the Maryland Code, Public Utilities Article, §7-306. The Maryland Energy Administration (MEA) administers incentive programs including the residential clean energy grant program. Local jurisdictions — Maryland's 23 counties plus Baltimore City — enforce building codes, zoning ordinances, and fire safety clearances derived from the International Building Code (IBC) and NFPA 70 (National Electrical Code, 2023 edition).

From a jurisdictional standpoint, systems are classified as:

1. Utility-scale systems (typically above 2 MW) — subject to Certificate of Public Convenience and Necessity (CPCN) review by the PSC
2. Commercial and industrial systems — subject to local building permits, MEA incentive rules, and utility interconnection agreements
3. Residential systems — subject to local permits and PSC net metering rules capping individual systems at 2 MW AC under Maryland net metering statute

The regulatory context for Maryland solar energy systems provides a full treatment of agency authority and code hierarchy.

Substantive Types

Substantive classification addresses how a system is configured technically, where it is sited, and how ownership is structured.

By Grid Connection

The most operationally significant split is between grid-tied and off-grid systems, examined in detail at grid-tied vs. off-grid solar in Maryland. Grid-tied systems export surplus electricity to the utility grid and receive net metering credits. Off-grid systems rely on battery storage or generator backup and have no utility interconnection, meaning PSC interconnection standards do not apply — but local electrical permits under NFPA 70 (2023 edition) still do. A hybrid configuration combines battery storage with grid interconnection, allowing both credit accumulation and backup capability. The solar battery storage in Maryland resource covers hybrid system requirements.

By Physical Installation Type

• Rooftop photovoltaic (PV) — mounted on residential or commercial roof structures; requires structural load assessment per IBC Chapter 16 and fire setback compliance per NEC 690.12
• Ground-mounted PV — installed on dedicated racking in open land; may trigger additional zoning review and stormwater management requirements under Maryland Department of the Environment (MDE) regulations
• Carport and canopy systems — elevated arrays over parking or agricultural structures; classified separately by some county jurisdictions for setback and height variance purposes
• Building-integrated photovoltaics (BIPV) — solar cells embedded in roofing material or facades; treated as both a structural and electrical system under local building codes
• Floating solar (floatovoltaics) — systems installed on water bodies; require MDE wetlands and waterways permits in addition to standard electrical permits

By Ownership and Financing Model

Ownership type affects incentive eligibility. Maryland's Renewable Portfolio Standard (RPS) Solar Carve-Out, administered under COMAR 20.61, generates Solar Renewable Energy Credits (SRECs) that accrue to the system owner. Under a power purchase agreement (PPA) or solar lease, the developer — not the property owner — typically retains SRECs and the federal Investment Tax Credit (ITC) under IRC §48(a). This ownership distinction is a primary decision boundary for residential and commercial customers.

By Participation Model

Community solar programs in Maryland represent a distinct category in which subscribers receive bill credits without hosting any physical equipment. The Maryland PSC has authorized community solar under its community solar pilot program rules, with individual subscriber shares capped at 200 percent of a subscriber's average monthly consumption.

Where Categories Overlap

A single installation can simultaneously occupy multiple classification categories. A 500 kW ground-mounted system on a farm is both a commercial-scale system (under PSC interconnection rules) and an agricultural installation (potentially subject to Maryland Department of Agriculture easement considerations, addressed at agricultural solar installations in Maryland). It may carry a PPA ownership structure while still qualifying under the MEA's commercial incentive programs, depending on project-specific documentation.

Rooftop systems with battery storage sit at the intersection of grid-tied PV rules, NEC Article 706 (energy storage systems) as revised in the 2023 edition of NFPA 70, and local fire code requirements for battery placement and ventilation. The how Maryland solar energy systems work — conceptual overview explains the technical mechanisms underlying these combined configurations.

Decision Boundaries

Selecting the correct system type is governed by four primary variables:

1. Site characteristics — roof orientation, shading profile, and structural capacity determine whether rooftop PV is viable; a roof assessment for solar in Maryland precedes design
2. Load and grid access — properties without reliable utility service may require off-grid or hybrid configurations; most Maryland properties in the BGE, Pepco, Delmarva Power, or Potomac Edison service territories have grid access
3. Ownership and financing intent — purchasers who want SREC revenue and the federal ITC (currently 30 percent of system cost under the Inflation Reduction Act of 2022, per IRC §48(a)) must own the system outright or through a loan
4. Scale and regulatory threshold — systems above 2 MW AC trigger CPCN review; systems below that threshold follow the process framework for Maryland solar energy systems, which covers standard interconnection and permitting sequences

The Maryland Solar Authority home provides orientation across all of these categories and their associated guidance resources.

Scope and Coverage Limitations

This page covers solar energy system types as they apply within the State of Maryland under Maryland PSC jurisdiction, Maryland Energy Administration program rules, and local county and municipal codes. It does not address federal land installations, systems in Washington D.C. (governed by DCPSC), or systems in Virginia or West Virginia. Rules governing Delaware's portion of the Delmarva Peninsula are outside this scope. Tribal land installations, offshore wind systems, and concentrating solar thermal (CSP) utility plants are not covered here, as Maryland's installed and permitted solar base consists almost entirely of photovoltaic technology under state and local — not federal land — jurisdiction.