Energy storage system access diagram

6 FAQs about Energy storage system access diagram

How does energy storage work?

Energy storage operates in parallel8 with the grid. Generation, if present is non-renewable. Metering is standard (non-net-metered). Energy storage and generation, if present, are not allowed to export energy to the grid9. The method of achieving #4 must be fully illustrated in the oneline diagram or described below.

Can energy storage equipment operate in parallel with the grid?

In Section 3.1.1 of the Xcel Energy Guidelines for Interconnection of Electric Energy Storage with the Electric Power Distribution System document (Energy Storage Guidelines document), EConfiguration 1A, the energy storage equipment is not capable of operating in parallel1 with the grid.

Can an energy storage device be interconnected without an interconnection review?

The declaration allows interconnection of the energy storage device without an interconnection review if this mode is secure from change. In Energy Storage Guidelines document Section 3.2.1, Configuration 2A, the energy storage equipment is not capable of operating in parallel with the grid.

What is parallel operation of energy storage?

“Parallel Operation of Energy Storage” – a source operated in parallel with the grid when it is connected to the distribution grid and can supply energy to the Interconnection Customer simultaneously with the Company's supply of energy3.

Can Xcel Energy interconnect a non-paralleling energy storage system?

If the energy storage system is operated ONLY in a non-paralleling mode, and such operating mode is secured from changes by unqualified personnel and end users2, submittal of this signed declaration allows interconnection of the energy storage portion without an interconnection review by Xcel Energy.

How do distributed energy resources work?

Historically, Distributed Energy Resources (DERs) were assembled from discrete components or functional assemblies where the logic and operational approaches could be seen and analyzed. Today, much of the functionality is handled by an on-board computer following firmware and software instructions in order to achieve the desired results.

Appendix A

System software and programming that is required to meet the Energy Storage Guidelines document provisions are inaccessible and/or password protected, with access restricted to
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