New Jersey Solar Energy Glossary: Key Terms and Definitions

Understanding solar energy terminology is essential for anyone navigating New Jersey's regulatory landscape, incentive programs, or installation process. This glossary defines the core technical, financial, and regulatory terms that appear throughout New Jersey solar policy documents, utility agreements, and contractor contracts. Coverage spans residential, commercial, and community solar contexts within New Jersey's jurisdiction. Readers unfamiliar with how these systems operate in practice may also consult the conceptual overview of how New Jersey solar energy systems work.

Definition and scope

A solar energy glossary serves as a controlled vocabulary: a standardized set of definitions that reduces ambiguity when interpreting contracts, permits, incentive applications, and regulatory filings. In New Jersey, solar terminology intersects at least three distinct regulatory domains — utility regulation (governed by the New Jersey Board of Public Utilities, or BPU), environmental permitting (administered through the New Jersey Department of Environmental Protection, or NJDEP), and federal tax code provisions administered by the Internal Revenue Service.

Scope and coverage: This glossary applies to solar energy installations and programs operating under New Jersey state law and BPU jurisdiction. It does not address solar regulations in neighboring states such as Pennsylvania, New York, or Delaware, even where shared utilities operate across state lines. Federal definitions (e.g., IRS definitions of "energy property" under 26 U.S.C. § 48) may differ from state-level interpretations and are not covered here except where explicitly noted. Policies specific to federally recognized tribal lands within New Jersey are also not covered.

How it works

Solar energy vocabulary is organized into four functional clusters: physical system components, electrical and grid concepts, financial and incentive instruments, and regulatory and permitting terms. Each cluster contains terms that interact — for example, a "solar renewable energy certificate" (SREC) cannot be understood without first understanding "alternating current (AC) output," because SRECs are denominated in megawatt-hours (MWh) of AC electricity delivered to the grid.

Core term definitions by cluster:

1. Photovoltaic (PV) cell — The smallest unit of a solar panel that converts photons into direct current (DC) electricity through the photovoltaic effect, as defined in IEEE Standard 1262.
2. Inverter — A device that converts DC electricity produced by PV panels into AC electricity usable by building loads and compatible with grid interconnection. Types include string inverters, microinverters, and power optimizers.
3. Net metering — A billing arrangement under which a utility customer's meter records the difference between electricity consumed from the grid and electricity exported to the grid. New Jersey's net metering rules are administered by the BPU under N.J.A.C. 14:8-4.
4. Solar Renewable Energy Certificate (SREC) — A tradeable instrument representing 1 MWh of solar electricity generation, used to demonstrate compliance with New Jersey's solar carve-out under the Renewable Portfolio Standard (RPS). More detail appears in the New Jersey SREC program guide.
5. Interconnection agreement — A contract between a solar system owner and a utility that governs the technical and commercial terms under which a distributed generation system connects to the distribution grid. New Jersey's process is detailed in the utility interconnection process guide.
6. Capacity (kW vs. kWh) — Kilowatts (kW) measure instantaneous power output (system size); kilowatt-hours (kWh) measure energy delivered over time. A 10 kW system operating at full output for 1 hour produces 10 kWh.
7. Tilt and azimuth — Tilt is the angle of a panel relative to horizontal (0° = flat); azimuth is the compass bearing of the panel face (180° = due south). Both parameters affect annual energy yield estimates used in solar energy production estimates.
8. Behind-the-meter (BTM) — Generation that serves on-site load before reaching the utility meter. BTM systems reduce grid consumption but do not export unless net metering is active.
9. Interconnection queue — The ordered list of distributed generation applications awaiting utility technical review. Queue position affects project timeline, as described in the solar timeline and milestones reference.
10. Community solar (shared solar) — A subscription-based model in which multiple customers receive bill credits proportional to their share of a remotely located solar array. New Jersey's program structure is governed by the BPU's Community Solar Energy Pilot Program rules.

Common scenarios

Scenario 1: Homeowner reviewing a contract
A homeowner encountering the term "levelized cost of energy (LCOE)" in a lease proposal needs to understand that LCOE expresses total system lifetime cost divided by total projected energy output in kWh. A lower LCOE indicates better economics but depends heavily on assumed degradation rates (typically 0.5% per year per NREL degradation study data) and discount rates. Solar contract review concepts are explored separately at New Jersey solar contract review concepts.

Scenario 2: Commercial property manager evaluating battery storage
Terms like "state of charge (SOC)," "depth of discharge (DoD)," and "round-trip efficiency" become critical when evaluating battery storage proposals. A lithium-ion battery rated at 10 kWh usable capacity with an 80% DoD limit has a total nameplate capacity of 12.5 kWh. The New Jersey solar battery storage systems page provides further classification.

Scenario 3: Low-income program applicant
Applicants to the BPU's Affordable Clean Energy (ACE) Program must distinguish between a "bill credit" (a reduction applied to a utility invoice) and a "rebate" (a cash payment), as the two instruments have different tax treatment and eligibility criteria. The New Jersey low-income solar programs page addresses these distinctions.

Decision boundaries

Term A vs. Term B comparisons — where definitions diverge:

Navigating the full regulatory context behind these terms — including BPU program rules, NEC electrical code requirements, and local zoning ordinances — is addressed in the regulatory context for New Jersey solar energy systems. The New Jersey Solar Authority home provides a structured entry point to all topic areas covered across this reference network.

Permitting terms such as "Authority Having Jurisdiction (AHJ)," "single-line diagram," and "plan review" are governed by the New Jersey Uniform Construction Code (UCC) administered by the New Jersey Department of Community Affairs (DCA). A system that passes plan review but fails field inspection cannot receive a Certificate of Approval, which in turn blocks utility interconnection.

References

• Internal Revenue Code § 48(a) — Energy Investment Tax Credit
• 26 U.S.C. § 48E — Clean Electricity Investment Credit
• Internal Revenue Code Section 25D — Residential Clean Energy Credit (Cornell LII)
• 26 U.S.C. § 48 — Energy Credit (Investment Tax Credit)
• Internal Revenue Code § 48 — Energy Credit (via Cornell LII)
• 26 U.S.C. § 25D — Residential Clean Energy Credit, Cornell LII
• 26 U.S.C. § 48 — Investment Tax Credit, via Cornell Legal Information Institute
• 225 CMR 14.00 — Solar Carve-Out II Renewable Energy Regulations