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3M Install ACCR Cable for Xcel Energy to Double Transmission Capacity

10 June 2005

3M have installed overhead composite conductor cable on a 10 mile stretch of line in Minnesota to double the transmission capacity.

Xcel Energy, which serves 3.3 million electricity and 1.8 million natural gas customers in 10 states, has installed and energized 3M's new aluminium conductor composite reinforced (ACCR) overhead conductor on a 10-mile line that is an integral part of the electricity grid in the Upper Midwest. It is the first commercial application of the ACCR, which more than doubles the transmission capacity of conventional conductors of the same diameter without requiring construction of new towers.

ACCR, a new type of bare overhead conductor, containing a multistrand core of heat-resistant aluminium matrix composite wires, retains its strength at high temperatures and is not adversely affected by environmental conditions, such as moisture or UV exposure. Because of its lightweight and reduced thermal expansion properties, the conductor can be installed on existing towers and requires no visual changes to a line or additional rights-of-way.

The new ACCR conductor was installed during an eight-week period on Xcel Energy's Black Dog-Blue Lake line in Minnesota, which extends from Shakopee to Burnsville. The high-capacity conductor will support the expansion of the utility's Blue Lake plant, which will provide additional power during peak demand periods in Xcel Energy's Upper Midwest service territory.

""The ACCR provided a fast and cost-effective option for delivering additional energy from Blue Lake to our 1.5 million electricity customers in the Upper Midwest,"" said Doug Jaeger, transmission vice president, Xcel Energy. ""Without it, we would have had to replace existing towers to accommodate larger sized conventional conductors. Use of the new conductor allowed us to boost capacity on the line, while avoiding major construction in an area with sensitive wetlands.""

3M ACCR is intended as a solution to thermally constrained transmission bottlenecks that have increasingly plagued electricity grids in recent years, causing brownouts and blackouts. According to Anderson, other major utilities are indicating strong interest in the high-capacity conductor.

""Energizing the Blue Lake line is a major milestone,"" said Anderson, noting that 3M anticipates closing additional sales of the ACCR within the next couple of months. ""We believe the ACCR will play a significant role in making the national electricity grid more reliable,"" he added.





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