Con Edison Solar Billing: Net Metering vs Value Stack

Con Edison serves 3.4 million customers across NYC and Westchester through two grid types, radial and network, that determine solar billing eligibility and export capacity limits independent of program enrollment dates.

Sources reviewed: 2026-10-19

Con Edison's Service Territory and Why Billing Arrangements Vary

Con Edison provides electric service to approximately 3.4 million customers across New York City and portions of Westchester County, delivering electricity through roughly 94,000 miles of underground cable and nearly 37,000 miles of overhead cable. That geographic and infrastructure diversity matters directly to solar customers because the type of distribution grid serving a given address, and the service classification assigned to that account, both shape which billing arrangement a solar installation may enter. A prospective solar customer cannot assume that a neighbor's arrangement automatically applies to their own account.

The utility's service territory spans two fundamentally different grid architectures. Radial grids, common on Staten Island and in Westchester, use feeders that carry power from a substation outward like spokes. Network grids, prevalent throughout Manhattan, Brooklyn, Queens, and the Bronx, tie multiple primary feeders together through network transformers connected in parallel on the secondary side, creating a mesh that improves reliability but adds interconnection complexity. Whether a customer sits on a radial or network circuit is an engineering fact about their address, not a choice they make, and it influences the interconnection review that must occur before any solar billing arrangement can begin.

Service classifications add a second layer of variation. Residential customers typically fall under Service Class 1 (SC1), small commercial customers with demand below 10 kW under Service Class 2 (SC2), master-metered residential buildings under Service Class 8 (SC8), and larger commercial accounts with demand at or above 10 kW under Service Class 9 (SC9). SC1 and SC2 accounts carry no demand charge, while SC8 and SC9 accounts include a variable demand charge adjusted monthly based on peak 30-minute demand. These distinctions affect how solar credits are applied and which program components are relevant to a given customer.

Sources: Con Edison solar photovoltaics guide, Con Edison solar energy installation FAQ.

Radial Versus Network Grid Interconnection and Its Billing Consequences

The type of distribution grid at a customer's address is not a billing preference; it is a physical characteristic that Con Edison's engineering review evaluates before a solar system can export power. On a radial service, export constraints can arise from the capacity of the local service cable, the primary feeder, or the ability of upstream switching equipment to handle reverse power flow. On a network service, the challenge involves network protector relays, which are automatic switches designed to open when power tries to flow back toward a high-voltage feeder. A large enough solar system exporting more power than local load can absorb may trigger those protectors.

Because most of the dense urban neighborhoods served by network grids have substantial load to absorb exported solar power, many residential projects can proceed. However, customers on dedicated spot or isolated networks face a more restrictive situation: an opening network protector could interrupt their own service. Con Edison has developed solutions including Adaptive Network Protector relay settings and a Communications Aided Tripping approach that involves reprogramming nearby protectors to tolerate back-feed up to a specified percentage of transformer rating. These solutions require Supervisory Control and Data Acquisition equipment, anti-islanding devices, and DNP3 data communications, all of which are the customer's financial responsibility.

The practical billing consequence of these distinctions is that the interconnection outcome determines whether a system can export at all, how much it can export, and therefore what billing credits are actually achievable. A system required to operate in a no-export mode generates value only through self-consumption offset; it produces no exported kWh that could be credited under any arrangement. Customers should obtain written engineering results from Con Edison before treating any projected export credit as reliable. The guide itself notes that the customer bears sole responsibility for proper design, operation, maintenance, and safety of their installation.

Sources: Con Edison solar photovoltaics guide.

Program Eligibility Is Not Automatic: What the Historical Dates Mean

Con Edison's guide and tariff history reference specific dates that mark regulatory transitions, not open enrollment windows available to every new applicant today. The New York State Public Service Commission issued an order on March 9, 2017, directing a transition away from traditional net energy metering toward a Value of Distributed Energy Resources framework. The guide notes that customers with solar installed before that date may have received grandfathered net energy metering for the life of their system, and that mass market customers with solar installed after that date, along with certain large on-site customers meeting specific capacity thresholds and installation timing, received Phase One NEM compensation unless they chose to opt into Value Stack rates. None of this history confirms that a new applicant today qualifies for any particular program.

Program availability at the time of a new application depends on current New York State PSC orders, Con Edison's active tariff (Rider R), any capacity limits that may be in effect, and the outcome of the interconnection review. The guide explicitly states that its information is subject to change without notice and that applicable laws, rules, regulations, tariffs, and specifications control over anything in the guide itself. A prospective customer should review the current version of Rider R and consult directly with Con Edison rather than inferring current eligibility from installation dates cited in a document dated July 2022.

This distinction matters because the credit calculation method differs substantially between programs. Grandfathered NEM, Phase One NEM, and Value Stack all handle excess generation differently, and the service class of the account interacts with whichever program applies. Before assuming a billing outcome, a customer needs written confirmation from Con Edison identifying which program their account has been enrolled in following a completed interconnection approval.

Sources: Con Edison solar photovoltaics guide, Con Edison solar energy installation FAQ.

Net Energy Metering: How kWh Netting Works and What It Does Not Cover

Under a net energy metering arrangement, a bidirectional meter measures the difference between the energy a solar system sends to the grid and the energy the customer draws from the grid during the same billing period. Con Edison's FAQ explains that a net meter measures the difference between the energy produced by the customer's generator and the energy that customer uses from Con Edison's grid. When a solar system produces more than the customer consumes in a given interval, the surplus flows out to the grid and the meter records a net export. When consumption exceeds production, the meter records net consumption, and the customer is billed for the difference.

An important distinction separates the two meters that solar customers often encounter. The production meter provided by an installer measures total energy output at the panels before conversion losses, while the Con Edison net meter measures only the net difference after the system interacts with the building's load. The installer's meter does not account for energy drawn from the grid or the site's overall consumption pattern. This means that a customer's solar bank of NEM credits reflects net exports, not gross production, and the two numbers can differ meaningfully depending on how much self-consumption occurs.

Under grandfathered NEM, excess credits accumulated over the year were cashed out each January at an avoided cost rate, which the FAQ describes as the average wholesale price of energy for the year increased by 6.6 percent. That avoided cost rate is lower than the per-kWh rate at which energy is consumed, which is why the guide recommends choosing a cash-out month when the solar bank is smallest. Phase One NEM removed the annual cash-out requirement; instead, credits carry over month to month and year to year. Neither arrangement involves time-varying monetary components the way Value Stack does, and neither should be confused with a tariff dispatch or settlement calculation.

Sources: Con Edison solar photovoltaics guide, Con Edison solar energy installation FAQ.

Value Stack: Export-Based Multi-Component Monetary Credits

Value Stack compensation differs from net energy metering in its fundamental structure. Rather than netting kWh against kWh at a single retail rate, the Value Stack converts exported kilowatt-hours into monetary credits assembled from multiple components, each reflecting a different attribute of the energy exported to the grid. The components can include an energy component, a capacity component, an environmental component, a demand reduction value, and a locational system relief value. The guide notes that Value Stack credits are based on export into the utility grid; solar generation that instantaneously reduces customer load behind the meter reduces the customer's bill by offsetting consumption, but only generation that exceeds site load and flows out to the grid is credited through the Value Stack.

The monetary value of a given exported kilowatt-hour therefore depends on when it is exported and where the system is located, because components such as the locational system relief value and the demand reduction value are site-specific and time-sensitive. This means that two identical solar systems at different addresses, or the same system exporting during different hours of the day, can produce different per-kWh credit values. The total credit appearing on a bill is a dollar amount, not a kWh bank, and it is applied against delivery charges, supply charges, and miscellaneous charges as shown in the bill example included in the guide.

Customers on SC9 or SC8 rates who receive demand charges should understand that solar credits offset dollar amounts on the bill but generally do not reduce the peak demand measurement itself, since demand is based on the highest 30-minute interval of consumption regardless of solar output during other periods. The FAQ confirms that solar panels can offset overall energy consumption but typically do not reduce monthly demand. This is a material difference from the kWh-netting model and affects the overall bill reduction that a demand customer can expect.

Sources: Con Edison solar photovoltaics guide, Con Edison solar energy installation FAQ.

Illustrative Value Stack Teaching Example: Why the Method Changes the Credit

The following is an original invented example created to illustrate how Value Stack credit arithmetic differs from a simple flat-rate retail calculation. It is not based on current Con Edison rates, actual component values, or any real customer bill. All assumptions are invented for teaching purposes only. In this example, suppose a solar system exports 100 kWh during one billing sub-period and 200 kWh during a different billing sub-period, for a total of 300 exported kWh in the billing period. During the first sub-period, assume the illustrative combined Value Stack rate for those exports is $0.05 per kWh, producing an illustrative credit of $5. During the second sub-period, assume the illustrative combined rate is $0.10 per kWh, producing an illustrative credit of $20. The total illustrative Value Stack credit for the 300 exported kWh would be $25.

Now consider a flat retail calculation using an invented rate of $0.30 per kWh applied uniformly to all 300 exported kWh. That arithmetic produces $90, more than three times the illustrative Value Stack result. The two methods are not interchangeable. The Value Stack method assigns different monetary values to exports depending on the time period and location-specific components in effect, while the flat retail approach applies one number to all exports regardless of timing. Neither figure in this example reflects an actual Con Edison credit, an actual component rate, or a guaranteed outcome for any customer.

This distinction has practical implications for how customers evaluate solar proposals. A proposal that estimates bill savings by multiplying total annual exports by a single retail rate does not replicate Value Stack arithmetic. Customers considering Value Stack enrollment should ask their installer to distinguish between total system production, self-consumed generation, and net exports, and to explain that the monetary credit per exported kWh will vary over time. The guide notes that the solar production meter provided by developers does not account for energy drawn from the grid or overall site consumption, reinforcing why gross production and net export are different inputs to any credit calculation.

Sources: Con Edison solar photovoltaics guide, Con Edison solar energy installation FAQ.

Written Utility Acceptance, Interconnection Steps, and Customer Responsibilities

A solar system may not begin exporting to Con Edison's grid until the utility has issued written acceptance, typically called a final acceptance letter or Permission to Operate letter. The interconnection process follows New York State's Standardized Interconnection Requirements, and Con Edison's guide lays out distinct tracks for small projects at or below 50 kW-AC and larger projects from 50 kW-AC up to 5 MW-AC. For small projects, the applicant submits documentation through the Power Clerk portal, Con Edison reviews diagrams and issues a line diagram approval letter, the contractor completes construction and tests the inverter, and then the applicant submits a self-certification form before Con Edison performs a final review and issues the acceptance letter. Export and billing credits begin only after that final step.

For larger projects, the process includes preliminary screening analysis, the possibility of a Coordinated Electric System Interconnection Review, cost commitments for any required system upgrades, and field verification testing before the Permission to Operate letter is issued. The guide notes that if a field verification test is failed, the applicant must resolve the issues and may appeal through a defined process before the project can proceed. Throughout this sequence, the Customer Project Manager assigned by Con Edison serves as the primary point of contact, and all work and equipment must conform to municipal codes, the National Electrical Code, the National Electrical Safety Code, and OSHA requirements in effect at the time of construction.

Customer responsibilities extend beyond the interconnection process itself. The guide states clearly that responsibility for proper design, operation, maintenance, and safety of the customer's installation rests solely with the customer. Con Edison's review confirms compatibility with its equipment and service requirements; it does not certify that the customer's system is safely or faultlessly designed. Customers should also be aware that solar billing credits do not eliminate the basic service charge, which the FAQ describes as covering administrative costs associated with maintaining the account and which is not energy-based.

Sources: Con Edison solar photovoltaics guide, Con Edison solar energy installation FAQ.

Verifying Your Bill After Solar Installation: Checks and Decision Points

After a solar system begins operating and billing credits appear, customers should verify that the bill reflects the correct program, the correct meter readings, and the appropriate credit structure before assuming the numbers are accurate. The Con Edison guide identifies the Customer Care Group as the team handling net metering billing and post-installation billing questions, with separate contact channels for residential and large commercial accounts. Customers enrolled in level billing should contact Con Edison promptly after installation to exit that plan, because the guide explains that level billing spreads expected annual costs over twelve equal payments and will not immediately adjust to reflect reduced solar-era consumption.

Customers who purchase supply from a third-party energy service company rather than directly from Con Edison should review their supply contract, because the FAQ notes that depending on the specific contract, the customer may be responsible for non-usage-based or value-added service charges. The value of private solar generation credits is described as the same regardless of supply source, but other contract terms can affect the net financial outcome. This is a document check that should occur before installation, not after the first bill arrives.

Supply arrangement is not uniform across all residential accounts. Some customers take supply from Con Edison under standard rates, others from energy service companies under negotiated contracts, and the billing interaction with solar credits differs in each case. Customers should also confirm that any time-of-use rate elections remain appropriate after solar installation. The guide notes that time-of-use rates generally do not benefit solar-only customers because credits remain in the on-peak or off-peak bucket in which they are generated, so a rate that appeared advantageous before installation may not be optimal afterward. Reviewing these details against the actual bill each month, rather than relying on projected savings, is the verification practice that the source documents support.

Sources: Con Edison solar photovoltaics guide, Con Edison solar energy installation FAQ.

Related research: Utility solar billing guides, new york solar guide, Net Metering vs Net Billing, Solar Permits, Inspections and Permission to Operate.