6.3. ERMUSR 08-12-2008Ji
Elk River -~
Municipal Utilities
13069 Orono Parkway • PO. Box 430
Elk River, MN 55330-0430
August 4, 2008
To: Elk River Municipal Utilities Commission
Jerry Takle
John Dietz
Jerry Gumphrey
From: Bryan Adams
Subject: United Health Group Data Center
Phone: 763.441.2020
Fax: 763.441.8099
Starting on Saturday, July 26, 2008, United Health Group started their final testing and was
utilizing approximately 9.3 MW/hour. Part of this testing is to run their onsite generation. This
testing concluded approximately Friday, August 2, 2008.
Because this week was hot and humid, GRE was interrupting their interruptible customers all
week and declaring these days critical peak pricing. Critical peak pricing means our purchased
energy price from GRE increases from $0.04406 to $0.09535. By UHG staying on our system
during GRE's system peak, it would have cost us approximately $165,000 in demand costs and
$2300/day in critical peak pricing. This savings is approximately 10% of our monthly power
bill. As a result of these economics, we ask UHG to utilize their generators between 4:00 p.m.
and 10:00 p.m. for the entire week as long as they were scheduled to run them anyway. They
were gracious enough to comply with our wishes. Attached is our system load curve for Monday
showing the load reduction. Apparently some of the neighbors around UHG became upset due
to the additional noise of the engine/generators. I do not know how to resolve this sound issue.
Apparently the noise levels at the property are within stated limits.
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