Learn about Expanded Net Energy Metering (NEMEXP)
Expanded Net Energy Metering (NEMEXP)
Qualifications
Expanded Net Energy Metering (NEMEXP) is a PG&E program for industrial customers installing solar, wind or hybrid generator systems that meet the following criteria:
- The generator must be larger than 30 kilowatts (kW).
- The maximum generator size is 1 megawatt (MW).
How to apply
Prior to interconnecting generation projects to PG&E’s distribution system, an interconnection application must be submitted, including some or all of the following documents:
| Item Requested | Purpose | |
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Electric Rule 21 application provides PG&E with important customer, contractor and system equipment information about the project. |
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Download NEM Load Aggregation Appendix (PDF, 113 KB) (Form 79- 1153) |
Form is only for an eligible customer applying under NEM Aggregation. Download the Frequently Asked Questions (PDF, 231 KB) document for additional information to effectively manage a NEM Aggregation (NEMA) project. |
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Single-Line Diagram |
Single-line diagram shows applicable equipment (generating units, step-up transformers, auxiliary transformers, switches/disconnects and required protection devices/circuit breakers). |
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Form is required if a third party is to handle application process. This gives the third party (usually the contractor) temporary authorization to act on the customer's behalf and receive confidential customer information. The authorization is required for the third party to receive a copy of the customer's permission to operate. |
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Variance Request |
The customer or customer's contractor can request a variance from PG&E if the project is unable to meet the requirements described in the Distribution Interconnection Handbook and Greenbook. |
The customer should apply using the Electric Rule 21 application and submit a single-line diagram as soon as possible, even before the system is built. This will allow PG&E's engineers to review the proposed system and, if necessary, request modifications, which may alter the total cost and interconnection timeline of a project.
For more information, download the generator interconnection process timeline (PDF, 154 KB).
Attention: PG&E may not be able to interconnect a generator if it is located in certain areas of San Francisco or Oakland. Please read our notice about Secondary Networks (PDF, 144 KB).
Interconnection requirements
The following items are required in order for PG&E to issue written permission to operate a generating facility:
| Item Requested | Purpose | |
|---|---|---|
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Declarations Page of Homeowner's Insurance |
Document provides PG&E with information about the level of insurance coverage (if any). |
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Interconnection agreement form is a legal contract between PG&E and the customer outlining each party's responsibilities. |
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Signed-Off Building Permit |
Completed permit indicates that the finished project has been inspected and approved by the local building authority. |
Costs and other considerations
Aside from the contractor’s bill to build the generation system, costs to participate in Net Energy Metering will depend upon the scope, size and complexity of a particular generation project. Possible costs include a metering cost, which depends on the rate schedule and present meter, as well as utility equipment needed to interconnect the generator. The metering cost may be required to provide a net meter at a customer's location. A net meter is a special type of meter capable of separately registering the flow of electricity in both directions. After the new meter is installed, PG&E will own and maintain this meter.
If existing generation equipment was previously interconnected and is still operational, this equipment must be included on subsequent applications to interconnect additional generation. Depending upon the existing generator technology and program type, a NEM Multiple Tariff interconnection may be required.