Stem has been granted a patent for a control system that maximizes the economic return of an energy storage system located behind a utility meter. The system uses a feedback-based communication and control method to prevent electrical power demand from exceeding a specified set-point during peak demand events. The control system can operate autonomously in case of a communications failure. GlobalData’s report on Stem gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Stem, Power grid analytics was a key innovation area identified from patents. Stem's grant share as of September 2023 was 72%. Grant share is based on the ratio of number of grants to total number of patents.

Control system for optimizing energy storage system behind utility meter

Source: United States Patent and Trademark Office (USPTO). Credit: Stem Inc

A recently granted patent (Publication Number: US11714441B2) describes a system and method for controlling energy transfer between an electric grid and an electric load location. The system utilizes computer-readable storage media and processors to monitor the rate of energy transfer from an electric line to the load location. This is achieved by coupling the electric line to an electric meter that measures power transferred between the load location and the grid.

The system receives a set of operating parameters, which are created based on various external inputs. These inputs can include weather information, sunrise and sunset data, power usage cost information, utility billing period, geographic location of the load location, local solar production, incident light, customer type, building specifications, grid operator data, and time data. The operating parameters are determined by an optimization engine located remotely from the load location.

Based on the received operating parameters, the system adjusts the energy transfer from an energy storage device to the electric line to ensure that the rate of energy transfer remains below a threshold value. This threshold value can vary with time, allowing for dynamic control of energy transfer.

The system also includes instructions for transmitting information used to control the rate of energy transfer to the optimization engine. In return, the system receives a second set of operating parameters derived from the transmitted information. The second set of operating parameters is used to control a second rate of energy transfer.

The system further includes instructions for comparing operating control curves, such as battery curves or demand set-point curves, with the rate of energy transfer. This allows for precise control of energy transfer between the energy storage device and the electric line based on the comparison.

Overall, this patented system and method provide a sophisticated approach to controlling energy transfer between an electric grid and an electric load location. By considering various external inputs and utilizing an optimization engine, the system ensures efficient and optimized energy transfer while maintaining the rate of transfer below a specified threshold.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.