America’s electric grid has become increasingly unstable – and it could begin impacting Minnkota Power Cooperative’s members this summer.

That’s why Minnkota and Cass County Electric Cooperative are joining many of our nation’s grid operators and regulators in sounding the alarm on the vulnerabilities that are affecting power reliability. As the pace of change in the energy industry continues to accelerate, so does the risk of rotating power outages and other extended service interruptions. Minnkota’s eastern North Dakota and northwestern Minnesota service area is no longer immune to the large-scale grid challenges that have been experienced in Texas and California in recent years.

As Cass County Electric Cooperative’s wholesale power provider, Minnkota takes its responsibility to provide reliable, resilient and responsible electricity seriously. The cooperative has more than enough generating capacity to meet the demands of its members through its coal, wind and hydro resources. But Minnkota does not operate on the grid alone. Utilities across the Upper Midwest are connected through Midcontinent Independent System Operator (MISO). Emergency events experienced in other parts of the MISO region can and do have impacts back into the Minnkota system.

One of the most significant industry issues is the retirement of baseload and dispatchable power plants – including coal, nuclear and natural gas – without adequate replacements. Wind and solar make up the majority of the new resources being added to the grid, but they are limited by the fact that they are only able to operate intermittently – when the wind is blowing or the sun is shining. While Minnkota supports moving toward a cleaner, more sustainable energy future, it is not something that can happen with the flip of the switch. It will take decades of planning and unprecedented technology development to achieve significant carbon reduction.

MISO expresses concerns

Minnkota is not alone in coming to these conclusions. MISO issued a dire warning in April that it does not have enough reliable power plant capacity on its system to meet its projected peak demand this summer. The result is an increasing risk of power outage events.

Minnkota both buys and sells surplus power in the MISO system, which estimates a 1,230-megawatt (MW) shortfall in power plant capacity to meet its reserve margin. For context, one megawatt-hour (MWh) is enough electricity to serve more than 800 homes with an hour’s worth of power.

“Due in large part to decarbonization goals set by our members and the states in our region, our resource fleet is increasingly reliant on intermittent and weather-dependent resources,” said Wayne Schug, vice president of strategy and business development at MISO. “As this trend continues in the future, MISO needs to evolve the grid, our markets, and our operational capabilities, which is just as complex as it sounds.”

In a recent interview in the Wall Street Journal, MISO CEO John Bear added to this point by saying, “As we move forward, we need to know that when you put a solar panel or a wind turbine up, it’s not the same as a thermal resource.”

MISO’s peak demand for electricity typically occurs in the summer months during the hottest days of the year. The organization is conducting training and exercises to prepare for worst-case scenarios and is also implementing lessons learned and best practices. Likewise, Minnkota’s energy marketing team is working to ensure it’s ready to respond to volatile market and reliability conditions.