How lessons from a microgrid project can lead the way to decarbonizing the electric grid
April 16, 2021
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A Washington State utility company uses automation, artificial intelligence and a smart energy management system to power the pilot project.


This Arlington Microgrid will demonstrate how various clean energy technologies–solar, battery storage, and electric vehicles–can work together to help with renewable energy integration and disaster recovery.

Image: Snohomish County Public Utility District

The second largest publicly owned power company in the Pacific Northwest just turned on a microgrid that can power its data center. This is the third energy storage project for the Snohomish County Public Utility District. The utility company is testing a new infrastructure that could form the electricity grid of the future. 

During a panel discussion on Wednesday, a project manager from the utility company talked with experts from Hitachi ABB Power Grids about the lessons they’ve learned from the work so far. Scott Gibson, a project manager at SnoPUD, spoke with Leah Kaffine, principal technical consultant, Hitachi ABB Power Grids, and John Glassmire, senior advisor, grid edge solutions at Hitachi ABB Power Grids. Peter Kelly-Detwiler, co-founder of energy consulting firm NorthBridge Energy Partners, moderated the conversation. 

Snohomish County PUD serves one of the fastest-growing counties in the Pacific Northwest, with more than 350,000 electricity customers and 21,000 water customers. It’s the second largest public utility in the Pacific Northwest. The public utility district has built three energy storage systems. The most recent project to come online is the Arlington Microgrid. 

SEE: 5 Internet of Things (IoT) innovations (free PDF) (TechRepublic)

This project brings together community solar, energy storage, vehicle-to-grid electricity delivery and advanced control systems to demonstrate grid resiliency and renewable energy integration, according to Jason Zyskowski, PUD assistant general manager of facilities, generation, power, rates and transmission management. He said, in a fact sheet about the project, that the work allows the district to test new technologies that will form the foundation of the future electric grid.  

The project was funded by a $3.5 million grant from the state. Hitacchi won the bid for building the project.

A microgrid is an independent energy system that serves a specific local area, can use multiple sources of renewable energy and is controlled by a software-based system. Microgrids are usually connected to traditional electric grids but they can operate independently during an earthquake or other natural disaster.

Gibson said the utility defined four use cases for the microgrid project:

  1. Determine the ROI for renewable energy.
  2. Demonstrate renewable energy integration to the existing grid.
  3. Provide support for the existing grid. 
  4. Serve as a backup power source during outages.

The group identified three lessons learned so far from from the microgrid project:

  • The importance of data and automation
  • The tipping point of renewable energy integration
  • The role of batteries

Tipping point for a new power management system

For many utility companies around the country, renewables provide only a small percentage of the overall energy. Operators can go about business as usual in terms of operational infrastructure until renewables hit 30-40% of the source mix, Kaffine said.

“At that point, utilities have to move to the next generation of digital technology to deal with the system being more complex and more interactive,” she said.

She also said that there are a lot of good uses for artificial intelligence in this transition, particularly with asset performance management.

“It can help with risk management as well such as more frequent extreme weather events,” she said.

Leah said that the cost of renewables is coming down so much that countries are able to set a realistic path to energy independence. 

The role of data and automation 

SnoPUD relies heavily on data and wanted a power source that could keep the lights on at the center during a natural disaster. 

Data plays a crucial role in modernizing traditional grids and then managing the new grid, Kaffine said. “You have to more actively manage your system and deal with more real-time data that you traditionally would,” she said.

Lean said that automation is most important for collecting and assembling data to predict maintenance and support other operation needs.

Glassmire said automation also helps with flatten out peaks in energy demand.   

“Automation, at its core, is sensing what you’re doing, taking the data, extracting the good parts and then doing something with it,” he said.

The importance of batteries

Gibson said that one important goal of the microgrid project was to illustrate the value of energy storage in modernizing electricity grids. “Battery storage is part of our future and this project helped us learn about all the technical and communications challenges,” he said.

Glassmire said that the traditional electric grid can’t support the variability inherent in renewables, and that’s where batteries come in. “You have to think about power generation on a really sunny day when the rest of the grid is not ready to handle that,” he said. “You have to make a technical jump to run all on renewables.” 

Glassmire sees batteries as a crucial enabling technology. “There’s nothing else in the portfolio that can help us hit 100% renewable penetration and you can’t do that without advanced power electronics,” he said.

Glassmire also said that a battery energy storage system is a great risk management device and should be part of the overall automation strategy. 

“Batteries can serve so many purposes, that’s the beauty, it buys you a lot of options,” he said. 

Galssmire said that another Hitachi microgrid project in Australia recently hit a technical milestone: a seamless cutover to renewable power when the traditional grid went down temporarily. 

He said that the industry is close to hitting that technical milestone and the next step in the decarbonization transition is policy change. 

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