From The Fort Collins Coloradoan (Jacy Marmaduke):
Platte River Power Authority’s call for customers to conserve energy on Sunday resulted from a perfect storm of energy supply issues, as extreme cold created a regional shortage of natural gas, ice and frigid temperatures restricted power from wind turbines and blankets of snow covered solar panels.
The power provider for Fort Collins, Loveland, Estes Park and Longmont issued a call to conserve energy — both gas-powered heat as well as electricity — Sunday from 4-10 p.m. Platte River spokesperson Steve Roalstad said the public call to conserve came after Xcel Energy notified Platte River on Sunday that gas supplies were being curtailed to preserve fuel for heating.
The curtailment has ended, and Platte River doesn’t expect further supply issues in the immediate future, Roalstad said. Xcel Energy didn’t explicitly confirm the curtailment in written comments provided to the Coloradoan, but a spokesperson said that “extreme weather conditions can be a challenge for power providers, and we are managing our resources to make sure our customers have the heat and power they need at this time.”
The supply challenges began this weekend as extreme cold impacted Platte River’s renewable energy resources, Roalstad said.
NextEra Energy, the company that operates the Roundhouse Renewable Energy wind farm in southern Wyoming, shut those turbines down as ice coated the blades and frigid temperatures threatened the turbines’ structural components. Meanwhile, snow coated the solar panels at Platte River’s Rawhide Energy Station…
Natural gas typically supplies less than 2% of the electricity Platte River provides to its owner-communities, because the power provider only uses it to provide an extra boost when demand is especially high. Platte River’s natural gas capacity is close to 400 megawatts, even more than the 280 megawatts of capacity at the Rawhide Unit 1 coal plant that supplied almost half of electricity in 2020.
Because of the temporarily curtailed supply, though, Platte River couldn’t run its natural gas units. So on Sunday, Platte River was essentially relying only on the Rawhide Unit 1 coal plant and Craig Units 1 and 2 (coal units Platte River co-owns). That didn’t leave much wiggle room for electricity supply, so the utility issued the public call to action. It was the first time in recent memory that Platte River has had to ask customers to conserve electricity in the face of a supply shortage.
Platte River asked customers to conserve energy by turning down their thermostats a few degrees and abstaining from using laundry machines, clothes dryers, dishwashers and other electric devices. The reason for the call to conserve gas-powered heat was two-fold, Roalstad said: Building heat pumps use electricity, and lessening the pressure on gas supplies for heating would hopefully lead to a quicker end to the gas curtailment.
Platte River sent the call to conserve to local media, shared it on social media and coordinated with local utilities to disseminate the information. That outreach appeared to be effective in reducing electricity demand, Roalstad said. Demand dropped by about 10 megawatts, which is roughly equivalent to the power needed for 5,000-8,000 households.
Roalstad described the call to conserve as a precautionary measure rather than a situation where rolling blackouts were imminent.
“I don’t think we were that close, but we just wanted to make sure we didn’t get any closer” to that point, Roalstad said…
Sunday’s scenario was noteworthy not just because of the extremely cold temperatures but because of the widespread regional nature of the issue. Frigid temperatures and winter storms swept much of the country this weekend, from Colorado to Texas to Tennessee. The broad geographical footprint of the extreme weather put more pressure than usual on the nation’s natural gas supply…
The renewable energy supply shortage illustrates a challenge that Platte River is working to address as it shifts to more renewable electricity supply in the years ahead, Roalstad said. Renewable sources are projected to make up about 50% of electricity delivered to Fort Collins, Loveland, Longmont and Estes Park in 2021, and the power provider has a goal of achieving 100% non-carbon electricity by 2030 if it can do so without sacrificing affordability and reliability.
Platte River is contemplating larger investments in battery storage or other alternatives to carbon resources. The power provider is also working to join a regional energy imbalance market, which could be helpful in situations where weather affects renewable energy supply in select areas. The science around renewable energy is also growing more sophisticated, which enhances predictability and reliability, Roalstad added.