Zero Energy Documentation
In This Article:
Energy Production and Demand Table
Completing the Zero Energy Production and Demand Table (utility bill data) is a requirement for certification, however utility billing data can come in a variety of different formats. The following instructions provide guidance on how to complete the table based on different types of utility bills:
- Net Metering Data: Projects with a net capable electric meter, meaning that their utility billing meter is capable of spinning two ways (one direction for energy use, and the other direction for energy produced and exported back onto the power grid), typically have a 'net total' number of kWh used during the billing cycle. Utility bills for projects with a net capable meter typically show the previous meter read, and the current meter read, then ask customers to pay the difference. It is typical in the summer months for Zero Energy projects to receive a credit for net positive energy performance, where a surplus of energy was produced onsite and exported back onto the power grid. Similarly, projects may produce less than they use during the winter months, and receive an electric bill for the total energy use during that billing cycle. In this scenario, project teams may enter the rolling 'net total' kWh listed on their utility bills into the 'net usage or generation' field of the energy table.
- Production Metering Data: Certain utility companies require solar customers to install a dedicated production meter for the onsite generation, which is designed to meter the total amount of renewable energy produced (kWh) during a billing period. This data can be entered into the 'Total Generation' field in the energy table.
- Digital Metering Data: Another billing scenario that is common for projects with advanced metering includes the metrics for energy received from the grid, as well as energy exported to the grid. Energy use data, which may be listed as 'received' or 'delivered' on a utility bill may be entered into the field titled 'Electricity Received from the Grid' on the energy table. Similarly, all exported energy sent back onto the grid by the project can be accounted for in the 'Electricity Provided to Grid' section of the energy table.
Energy System Schematic
This piece of documentation is a required upload in the Renewable Systems Information Task. The intent of the Energy System Schematic is to orient the Auditor to the project, specifically significant on-site energy-using systems, on-site energy producing systems, and the connecting equipment and meters. Ultimately, the Auditor will be looking at the Energy System Schematic to gage whether energy production and demand seem reasonable and to confirm no on-site combustion is present (without an appropriately applied Exception.)
Several types of documents can be used to meet the requirements of this document; here a couple, followed by good examples:
- A single-line or one-line diagram: If your project has a renewable energy-system connected to the grid, it's very likely this document has already been created, because it's typically what's required by the utility in order to permit your project.
- An annotated diagram: This is not a standard drawing, but can be used to demonstrate the intent of the Energy System Schematic by generalizing systems and connections.
- A mechanical systems drawing / equipment schedule: These are typically standard drawings, and if they show - or can be annotated to demonstrate - the intent of the Energy System Schematic, they are ok to use.