Maryland Net Metering Explained

Maryland's net metering framework governs how residential and commercial solar system owners receive compensation for electricity sent back to the grid, directly affecting the financial return on any solar investment in the state. Administered under the authority of the Maryland Public Service Commission (PSC), net metering rules set the billing methodology, capacity eligibility thresholds, and interconnection requirements that determine whether a solar system generates meaningful bill savings or marginal ones. This page covers the definition, mechanics, causal structure, classification boundaries, contested tradeoffs, and common misconceptions of Maryland net metering — grounding each topic in the specific statutes and regulatory orders that control it.

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

Definition and Scope

Net metering in Maryland is a billing arrangement authorized under Maryland Code, Public Utilities Article §7-306 that allows a customer-generator — a customer who owns an eligible on-site generation system — to offset electricity consumption charges with electricity the system exports to the utility grid. The "net" in net metering refers to the difference between kilowatt-hours (kWh) consumed from the grid and kWh delivered to it within a billing period.

Maryland's net metering statute applies to systems that use solar photovoltaic (PV), wind, micro-combined heat and power, fuel cells, micro-hydroelectric, or other qualifying renewable sources. Solar PV systems account for the dominant share of enrolled net metering accounts across the state's major investor-owned utilities.

Scope and Coverage Limitations

This page addresses net metering rules as applied under Maryland PSC jurisdiction, covering customers of investor-owned utilities including Baltimore Gas and Electric (BGE), Pepco, Delmarva Power, and Potomac Edison. Electric cooperatives and municipal utilities in Maryland operate under separate regulatory frameworks and may apply different or no net metering provisions — this page does not govern those entities. Federal programs, including net energy metering administered under FERC jurisdiction for wholesale transactions, fall outside this scope. Maryland community solar programs operate under a parallel but distinct billing mechanism called a "virtual net metering" or bill credit structure, which is not the same as the direct net metering framework described here.

Core Mechanics or Structure

Under Maryland's net metering rules, a customer-generator's utility meter tracks electricity flow in both directions. When the solar system produces more electricity than the customer is consuming at a given moment, the surplus flows onto the grid and the meter runs backward (or, in modern advanced metering infrastructure installations, the outflow is recorded separately). At the end of the billing period, the utility calculates the net difference.

Monthly Billing Cycle

• If consumption exceeds generation: the customer pays for the net kWh consumed at the standard retail rate.
• If generation exceeds consumption: the customer receives a credit applied to the next billing period.

Excess generation credits carry forward month to month. Under the Maryland PSC Order No. 87082, excess credits that remain at the end of the 12-month annualization period are compensated at the utility's avoided-cost rate, which is substantially lower than the retail rate — a distinction with significant financial implications detailed in the Tradeoffs section below.

Capacity Limits

Maryland law caps individual net metering system size at 2,000 kW (2 MW) for non-residential customers and at a system size no greater than rates that vary by region of the customer's annual electricity consumption for residential customers (Md. Code, Public Utilities Art. §7-306(c)). The statewide aggregate net metering cap is set at 3,000 MW under the Clean Energy Jobs Act of 2019 (Senate Bill 516).

For additional context on how solar systems interface with the grid in Maryland, see How Maryland Solar Energy Systems Work.

Causal Relationships or Drivers

Net metering rates and rules do not exist in isolation — they emerge from the intersection of state policy goals, utility economics, and federal electricity regulation.

Policy Drivers

Maryland's Renewable Portfolio Standard (RPS), which requires electricity suppliers to source specified percentages of power from renewable sources, creates an institutional incentive to support distributed generation enrollment. Net metering functions as one mechanism to accelerate residential and commercial solar adoption. The Maryland General Assembly's Clean Energy Jobs Act of 2019 raised the aggregate net metering cap to 3,000 MW, reflecting a deliberate policy choice to expand access. The Maryland Renewable Energy Portfolio Standard page covers the RPS framework in detail.

Utility Revenue and Rate Design

From a utility perspective, net metering customers who zero out their bills still use the grid for backup power, transmission, and distribution infrastructure. Utilities argue that low net bills shift fixed infrastructure costs onto non-solar ratepayers. This cost-shifting argument has driven ongoing PSC proceedings examining whether net metering compensation rates should be adjusted. BGE, Pepco, and Delmarva Power have each filed rate cases before the PSC that include net metering compensation as a contested variable.

Solar Resource and Export Volume

Maryland's average solar irradiance — approximately 4.5 to 4.7 peak sun hours per day depending on location — determines how much excess generation a rooftop system produces. A south-facing, unshaded 10 kW system in Baltimore County will produce surplus kilowatt-hours in spring and fall months and may run a deficit in winter, meaning the annual true-up mechanism has a direct mathematical effect on net savings. More on production estimates is available at Solar Energy Production Estimates for Maryland Climate.

SREC Market Interaction

Net metering credits are separate from Solar Renewable Energy Credits (SRECs). A system owner earns 1 SREC per 1,000 kWh produced, which can be sold independently of net metering bill credits. The Maryland Solar Renewable Energy Credits (SRECs) page addresses that mechanism.

Classification Boundaries

Maryland's net metering framework distinguishes between customer classes with different rules applied:

Residential vs. Non-Residential

Residential customer-generators face a system size cap tied to rates that vary by region of annual consumption. Non-residential (commercial, industrial, government, nonprofit) customers may install up to 2,000 kW. Both classes receive retail-rate credits for net monthly consumption offsets.

Aggregate Net Metering

Maryland also permits aggregate net metering, where a customer with multiple meters on contiguous or non-contiguous parcels (such as a farm with multiple structures) can aggregate generation from one system against consumption across multiple meters. This is governed by separate PSC rules and has specific eligibility criteria distinct from standard single-meter net metering.

Behind-the-Meter vs. Exported Generation

Generation consumed directly behind the meter (self-consumption) avoids the grid and never enters the net metering calculation — it simply displaces retail purchases at full value. Only surplus generation exported to the grid enters the net metering credit calculation. This distinction matters for sizing decisions and for solar battery storage in Maryland, where batteries can shift self-consumption to peak hours.

Interconnection Tier

Maryland utilities apply interconnection tiers (Tier 1, Tier 2, Tier 3 under Maryland PSC-administered interconnection rules) based on system size and grid impact. Tier 1 covers systems up to 10 kW for residential applications under a simplified process. Larger systems require more detailed engineering review, which affects both installation timelines and cost. The Maryland Utility Interconnection Requirements page covers interconnection tiers in detail.

Tradeoffs and Tensions

Retail-Rate Crediting vs. Avoided-Cost Compensation

The most contested dimension of Maryland net metering is the valuation of exported electricity. Under current rules, customers receive retail-rate credits for net monthly exports, but end-of-year excess credits roll over at the lower avoided-cost rate. For a customer who consistently over-produces — for instance, a household that installed a rates that vary by region consumption-sized system — a significant volume of generation receives avoided-cost compensation of roughly 3–5 cents/kWh rather than the retail rate of 12–15 cents/kWh (specific rates vary by utility and rate schedule). This gap represents real financial undercompensation relative to retail equivalence.

Utility Cost-Shifting Claims

Utilities and non-solar ratepayer advocates argue that retail-rate net metering subsidizes solar adopters at the expense of customers who cannot afford or cannot install solar. The PSC has held proceedings examining this claim, including dockets for BGE and Pepco. To date, Maryland has not moved to eliminate retail-rate net metering but has implemented the avoided-cost true-up as a partial accommodation.

Grid Stability and High-Penetration Scenarios

As net metering penetration rises in dense residential areas, distribution circuits can face reverse power flow, voltage fluctuation, and protection coordination challenges. These are engineering constraints, not hypothetical ones — they are documented in IEEE Standard 1547-2018 (Standard for Interconnection and Interoperability of Distributed Energy Resources with Associated Electric Power Systems Interfaces), which Maryland utilities reference in their interconnection tariffs.

Battery Storage and Net Metering Interaction

Adding battery storage changes the net metering calculus. A system with storage can reduce grid exports by storing surplus, which reduces net metering credits but increases self-consumption value. Whether this is financially advantageous depends on the customer's rate structure, utility time-of-use tariff availability, and battery cost — none of which are fixed variables.

Common Misconceptions

"Net metering means the utility pays cash for excess solar."
Maryland net metering produces bill credits, not cash payments. Excess end-of-year credits not consumed within the 12-month period are compensated at avoided-cost rates, not retail rates, and the compensation mechanism is a credit against future bills or, in some utility tariffs, a check for a small residual amount — not a guaranteed cash payout at retail value.

"Net metering eliminates the electric bill entirely."
Even a system that generates rates that vary by region of a household's annual kWh consumption will not produce a amounts that vary by jurisdiction utility bill. Maryland utilities apply fixed monthly customer charges and, in some cases, standby or demand charges that are not offset by net metering kWh credits. BGE's standard residential rate schedule includes a fixed customer charge regardless of net generation.

"Net metering rules are set by the federal government."
Maryland's net metering rules are set by the Maryland PSC under state statute. FERC does not directly regulate retail net metering for end-use customers. The Maryland PSC and Solar Energy Oversight page details the commission's jurisdictional role.

"Net metering and SRECs are the same financial benefit."
They are distinct mechanisms. Net metering credits offset electricity charges on the utility bill. SRECs are tradeable certificates representing the environmental attribute of 1,000 kWh of solar generation, sold separately in Maryland's SREC market. A system owner can receive both simultaneously — they are not mutually exclusive, nor do they overlap in calculation.

"All Maryland utilities offer the same net metering rates."
Rate schedules differ by utility. BGE, Pepco, Delmarva Power, and Potomac Edison each have PSC-approved tariffs with slightly different fixed charge structures, avoided-cost true-up rates, and interconnection application fees. Customers should reference their specific utility's PSC-approved tariff schedule.

Checklist or Steps

The following sequence describes the process a Maryland property owner would follow to establish net metering service. This is a procedural reference, not installation or legal advice.

1. Verify utility jurisdiction — Confirm the property is served by a Maryland PSC-regulated investor-owned utility (BGE, Pepco, Delmarva Power, or Potomac Edison) rather than a cooperative or municipal utility.
2. Determine system size eligibility — Residential systems must not exceed rates that vary by region of the prior 12 months of electricity consumption; non-residential systems must not exceed 2,000 kW.
3. Complete interconnection application — Submit a Tier 1, 2, or 3 interconnection application to the serving utility. Application forms and fees are utility-specific and PSC-regulated.
4. Obtain local permits — Secure building and electrical permits from the applicable county or municipal authority having jurisdiction (AHJ). Maryland does not have a uniform statewide solar permitting process; requirements vary by county.
5. Pass inspection — Schedule and pass electrical inspection by the AHJ. The Maryland State Department of Labor oversees electrical licensing standards relevant to inspection compliance.
6. Receive utility approval to operate — After inspection sign-off, submit the Permission to Operate (PTO) documentation to the utility. The utility installs a bi-directional meter if not already in place.
7. Activate net metering tariff — The utility enrolls the account in the applicable net metering rate schedule. Monthly billing under net metering begins from this date.
8. Track annual true-up date — Note the 12-month annualization period start date. Excess credits remaining at true-up are compensated at avoided-cost rates.
9. Apply for SRECs separately — Register the system with PJM-GATS (PJM Environmental Information Services Generation Attribute Tracking System) to begin earning SRECs, which are independent of net metering enrollment.

For more on permitting requirements, see Permitting and Inspection Concepts for Maryland Solar Energy Systems. For a broader view of the solar installation landscape in Maryland, Maryland Solar Authority's homepage provides orientation across all major topics.

Reference Table or Matrix

Maryland Net Metering: Key Parameters by Customer Class

Net Metering vs. Community Solar: Key Distinctions

References

• Maryland Code, Public Utilities Article §7-306 — Net Metering
• Maryland Public Service Commission (PSC)
• Maryland Clean Energy Jobs Act of 2019 (Senate Bill 516) — Maryland General Assembly
• [PJM