Maryland Solar Renewable Energy Credits (SRECs)

Maryland Solar Renewable Energy Credits (SRECs) are tradable certificates issued to solar energy system owners for every megawatt-hour (MWh) of electricity their systems generate. This page covers the regulatory foundation, market mechanics, classification distinctions, and practical framework governing SRECs under Maryland's Renewable Portfolio Standard. Understanding how SRECs function is essential for any property owner, developer, or energy professional operating a grid-tied solar system in Maryland, because SREC revenues can meaningfully alter the financial structure of a solar installation.

• Definition and Scope
• Core Mechanics or Structure
• Causal Relationships or Drivers
• Classification Boundaries
• Tradeoffs and Tensions
• Common Misconceptions
• Checklist or Steps (Non-Advisory)
• Reference Table or Matrix

Definition and scope

A Solar Renewable Energy Credit (SREC) represents 1 MWh of electricity generated by a qualified solar photovoltaic (PV) or solar thermal system. SRECs are distinct from the electricity itself — the physical kilowatt-hours flow to the grid or serve on-site load, while the SREC is a separate, tradable commodity that evidences the solar origin of that generation.

Maryland's SREC framework exists within the state's Renewable Portfolio Standard (RPS), administered by the Maryland Public Service Commission (PSC) under Md. Code Ann., Public Utilities Article §7-703. The RPS mandates that retail electricity suppliers obtain a defined percentage of their electricity from solar sources each compliance year. Suppliers satisfy this obligation by retiring SRECs — purchasing them from solar generators and submitting them to the PSC as proof of compliance. The compliance obligation drives the demand side of the SREC market.

Scope of this page: This page addresses SRECs issued under Maryland's RPS solar carve-out. It covers residential, commercial, and community solar systems physically located in Maryland and generating electricity for consumption within PJM Interconnection service territory. Systems located in neighboring states — even those selling power into Maryland — operate under different certification requirements and are not covered here. Federal tax treatment of SREC income, while referenced for context, is a federal matter governed by IRS rules and falls outside the scope of this state-level reference. For broader program context, the Maryland Solar Authority index provides orientation across all major program areas.

Core mechanics or structure

Generation and metering: When a qualifying solar system produces electricity, a revenue-grade production meter records output in kilowatt-hours (kWh). Once cumulative generation reaches 1,000 kWh (1 MWh), one SREC is created. The metering infrastructure must meet standards set by the applicable utility's tariff and the PSC interconnection rules; see Maryland utility interconnection requirements for meter specification context.

Registration and issuance: SRECs in Maryland are issued through the PJM Environmental Information Services (PJM-EIS) Generation Attribute Tracking System (GATS). System owners register their facility in GATS, linking meter data to a generator account. PJM-EIS verifies generation data and automatically issues SRECs into the owner's GATS account on a monthly or quarterly basis depending on system size and data reporting frequency (PJM-EIS GATS).

Trading: SRECs are sold on either the spot market or through long-term contract arrangements called SREC purchase agreements. Aggregators and brokers facilitate transactions between generators (sellers) and electricity suppliers (buyers). SREC prices fluctuate based on supply relative to the RPS solar carve-out obligation. Maryland's PSC publishes the Solar Alternative Compliance Payment (SACP) rate, which effectively sets a price ceiling — suppliers will pay no more for an SREC than it costs to pay the SACP penalty instead.

Retirement and compliance: Electricity suppliers retire SRECs through GATS to demonstrate compliance with the solar carve-out for each compliance year. Retired SRECs cannot be resold or reused. The PSC audits supplier compliance filings annually.

The overall structure of how solar installations feed into this credit economy is explained in the conceptual overview of how Maryland solar energy systems work.

Causal relationships or drivers

RPS carve-out percentage as demand driver: The solar carve-out within Maryland's RPS increases on a scheduled statutory ramp. As the required percentage rises, more SRECs must be retired annually, increasing aggregate demand. When installed solar capacity grows faster than the carve-out obligation, SREC prices fall. When capacity lags behind the obligation, prices approach the SACP ceiling.

SACP ceiling effect: Maryland's SACP for the 2024 compliance year was set at $50 per SREC for Tier 1 solar (Maryland PSC RPS Annual Reports). The SACP functions as a hard price cap — no rational buyer pays above SACP because the penalty is a cheaper alternative. This cap protects suppliers but limits generator upside.

System oversupply dynamics: Between 2014 and 2018, rapid Maryland solar deployment caused SREC supply to substantially exceed compliance demand, pushing prices to near zero in some periods. Statutory revisions that increased the solar carve-out obligation partially corrected this imbalance. Monitoring the annual PSC compliance data is the primary method for tracking supply-demand balance.

Interconnection and permitting triggers: An SREC cannot be issued for generation that occurred before the system received utility interconnection approval and was registered in GATS. Delays in permitting and inspection therefore delay the onset of SREC revenue, a structural dependency that project timelines must account for.

Classification boundaries

Maryland distinguishes between SREC types based on several criteria:

Tier 1 vs. Tier 2: The Maryland RPS classifies renewable resources into Tier 1 and Tier 2. Solar PV and solar thermal systems qualify as Tier 1 resources, which carry the higher compliance value and satisfy the solar carve-out. Tier 2 resources (largely legacy hydroelectric) cannot fulfill the solar-specific obligation.

In-state vs. out-of-state eligibility: To qualify for Maryland's solar carve-out, a system must be physically located in Maryland or in a state with a certified renewable energy credit reciprocity agreement with Maryland. The PSC maintains the list of approved out-of-state systems. Most SREC market participants are Maryland-sited systems.

System size thresholds: GATS registration requirements and data reporting intervals differ by nameplate capacity. Systems below 10 kW may use simplified metering protocols; systems above 10 kW require interval data recording. Community solar projects, governed by Maryland Community Solar Programs, have separate subscriber allocation rules for SREC distribution.

Solar thermal: Solar thermal systems generating equivalent BTU output can convert that output to SREC-equivalent credits using a defined conversion factor established by PJM-EIS. This is less common than PV-based SREC generation and subject to additional documentation requirements.

Tradeoffs and tensions

Price volatility vs. contract certainty: The spot SREC market offers potentially higher prices during supply-constrained periods but exposes sellers to severe price drops during oversupply. Long-term SREC contracts (typically 3–10 years) provide revenue certainty but lock in prices that may fall below future spot rates. Project finance structures for commercial solar often require contracted SREC revenue streams to meet debt service coverage requirements.

Maryland-only market depth: Because Maryland's solar carve-out is state-specific, the market is relatively thin compared to multi-state REC markets. A single large procurement decision or a change in the statutory carve-out schedule can disproportionately move prices. Generators in Delaware or Virginia face the same dynamic in their respective state markets.

Additionality vs. stacking incentives: SRECs can, under current Maryland rules, be combined with federal incentives such as the Federal Investment Tax Credit and Maryland state grant programs. However, if a system receives certain grant funding that specifically prohibits SREC monetization, the owner may be required to transfer or retire SRECs rather than sell them — a restriction that must be verified at the grant award stage through Maryland solar grant programs documentation.

Net metering interaction: SREC generation is based on gross production, not net consumption. A system that produces 10 MWh but consumes 4 MWh on-site still generates 10 SRECs. Maryland net metering addresses the billing credit for excess electricity separately from SREC accounting, and the two mechanisms operate on different accounting bases.

Common misconceptions

Misconception: SRECs are the same as net metering credits.
Correction: Net metering credits are billing offsets for excess electricity delivered to the grid, calculated in kWh and applied against the owner's utility bill. SRECs are separate certificates representing the environmental attribute of generation. They are sold independently and have no direct relationship to a utility bill credit amount.

Misconception: All renewable energy certificates (RECs) qualify for Maryland's solar carve-out.
Correction: Only SRECs from qualifying solar facilities — registered in GATS and meeting Maryland's Tier 1 eligibility criteria — satisfy the solar-specific RPS obligation. A generic wind REC, while also a Tier 1 resource, does not fulfill the solar carve-out requirement.

Misconception: SREC prices are guaranteed or set by the state.
Correction: Maryland sets the SACP, which is a ceiling on what suppliers will pay, not a floor or a guarantee. Actual transaction prices are market-determined and can fall significantly below the SACP, including to near zero during oversupply periods, as occurred in the mid-2010s.

Misconception: SRECs are issued automatically from the date of installation.
Correction: SREC issuance requires GATS registration, which is a separate administrative process from utility interconnection approval. Generation that occurs before GATS registration is generally not retroactively credited. The registration process takes time and requires specific documentation from the system owner or their designated representative.

Misconception: Community solar subscribers earn SRECs proportional to their subscribed capacity.
Correction: For community solar projects, the project owner holds the SREC rights by default unless the subscriber agreement explicitly assigns SREC ownership to subscribers. Subscribers should review contract terms through the framework described in Maryland Community Solar Programs before assuming SREC entitlement.

Checklist or steps (non-advisory)

The following sequence reflects the documented process for an eligible Maryland solar system to begin generating and monetizing SRECs. This is a factual description of administrative steps, not professional advice.

1. Obtain utility interconnection approval — Submit interconnection application to the applicable electric distribution company (BGE, Pepco, Delmarva Power, or Potomac Edison) per PSC interconnection tariff. Approval is a prerequisite for SREC-eligible generation. See Maryland utility interconnection requirements.

2. Pass all required inspections — Local jurisdictional permit and electrical inspection sign-off must be complete. The system must comply with applicable National Electrical Code (NEC) articles, including Article 690 of NFPA 70 (2023 edition), and local amendments before commercial operation.

3. Obtain a production meter — Revenue-grade metering must be installed and verified. For systems above 10 kW, interval data logging capability is required by PJM-EIS GATS standards.

4. Register the generating facility in PJM-EIS GATS — Submit facility registration documentation, including interconnection approval letter, system specifications, and meter data, to PJM-EIS. Account approval and facility activation are required before SRECs can be issued.

5. Establish meter data reporting — Configure automated meter data uploads to GATS or arrange for manual data entry consistent with the system's reporting interval.

6. Monitor SREC issuance — Review GATS account monthly or quarterly to confirm SRECs are being issued in alignment with metered generation data.

7. Select a sales channel — Determine whether to sell on the spot market (through an SREC aggregator or broker), negotiate a bilateral long-term contract, or participate in a PSC-approved procurement event.

8. Execute SREC transfers in GATS — Complete transfers to the buyer's GATS account. Retain transaction documentation for tax reporting purposes, as SREC revenue is treated as taxable income under IRS guidance.

9. Verify annual compliance calendar — Maryland compliance years run June 1 through May 31. SRECs must be retired by the applicable deadline to count toward that compliance year. Track expiration windows — Maryland SRECs have a defined vintage period after which they expire.

Reference table or matrix

References

• Maryland Public Service Commission — Renewable Portfolio Standard
• Maryland Code Annotated, Public Utilities Article §7-703
• PJM Environmental Information Services — Generation Attribute Tracking System (GATS)
• PJM-EIS GATS Operating Rules and Procedures
• Maryland Energy Administration — Solar Programs
• U.S. Department of Energy — Renewable Energy Certificate (REC) Basics
• National Electrical Code (NEC), NFPA 70 2023 Edition — Article 690: Solar Photovoltaic (PV) Systems