Rock Products

MAR 2018

Rock Products is the aggregates industry's leading source for market analysis and technology solutions, delivering critical content focusing on aggregates-processing equipment; operational efficiencies; management best practices; comprehensive market

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44 • ROCK products • March 2018 www.rockproducts.com Charleston Stone charges made up 42 percent of Charleston Stone's electric bill in 2016. 17 CMEC has offered to assist the quarry in managing demand by providing real-time access to meter data, which would show 15-minute interval demand. This would provide the means for Charleston Stone to observe their demand and adjust operations to reduce demand charges. The co-op is offering to pay about half the cost of setting up this capabil- ity. Charleston Stone has not taken CMEC up on the offer yet, but may do so once all the changes to the crushing operation have been made. The projected annual energy cost for the new electric rock crusher is expected to be higher than diesel when diesel is at historically low prices, and much lower than diesel when it is at historically high prices (see Figure 8). At today's diesel price, which is slightly higher than $2.50/gal., Charleston Stone could see energy savings of almost $5,000 per year. Any reduction in energy costs will be welcome, of course, but it is clear that the change in energy costs is just a fraction of the financial benefits Charleston Stone should realize from increased productivity and product quality. The company expects that the net result of more stable operating costs, increased productivity, and reduced downtime will make them more competitive. The company should be able to retain the existing workforce and even add up to five new employees as they expand production over the next three years. 18 FIGURE 8: Diesel crusher vs. electric crusher energy cost/year at different prices per gal. 3 Days | Live Demonstrations | 500 Exhibitors | Free Entry 26 – 28 June | Hillhead Quarry | Buxton | Derbyshire | UK Register free today at hillhead.com #Hillhead18

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