We have previously discussed the Council’s ongoing failure to address the overloading of the substations that serve the South and Southwest and also affect power downtown. The overloading has only gotten worse. In 2015 the Perche Creek substation exceeded its loading goal by 22%. In 2017, that number was 29%. In July of 2018, it was 48%. Perche Creek was not the only substation to exceed its loading goals in July. Blue Ridge, Rebel Hill, and the Power Plant all exceeded 100% of their loading goals. Hinkson Creek was at 99%.
Electric systems must have reserve capacity for times of high loads and/or problems with the system such as those caused by storms, to avoid outages. This overloading is a current issue, not one for future planning. We were lucky this year. What might have happened had we had longer stretches of extreme heat as we did in 2011?
Until put on hold by the City Council, installation of the Mill Creek substation was part of Water & Light’s contingency plan to keep the system up and running under adverse conditions. (Compare these 2016 maps which show the system without Mill Creek, and with its addition.) “Load shedding” is a focus of the current plan. This was explained to the City Council in January 2018, although it did not draw much discussion. Where would outages occur? Depending on where the load needed to be dropped, outages would start with the circuits tied to that particular substation and after that, would occur on circuits identified “from a priority or community impact relationship.” (Minutes, January 2, 2018, pp. 13 and 14.)
How would your business, residence, or our community be affected by an extended outage? Is this a risk we are willing to simply live with? If not, speak up! Electric infrastructure takes time to plan and install. We have 11 months before next summer. This is an urgent issue that needs ongoing attention. Can we develop an action plan for Vision: Lights On!?