Emerson Looks to a Solar Future

7 comments

Emerson Network Power has installed this 7,800 square foot solar array on the roof of its new St. Louis data center.

Emerson Network Power has installed this 7,800 square foot solar array on the roof of its new St. Louis data center.

Perched atop Emerson’s new data center is a 100-kilowatt solar panel array, which is visible across the company’s corporate campus in St. Louis. That’s one of the reasons for its high-profile location. “You can see this array from around the campus,” said Keith Gislason, an IT strategic planner for Emerson who directed the project. “It’s about the message, too.”

Solar power has had difficulty gaining traction in the data center industry due to cost and capacity challenges. But Emerson took a forward-looking approach for its $50 million facility, and sought to craft a design that could demonstrate the potential for solar in the data center. Steve Hassell, Vice President and Chief Information Officer at Emerson, calls the St. Louis solar array “an aspirational project.”

“The solar component was something we used almost as an experiment to learn the pros and cons,” said Hassell. “This is the way the world is going, and it’s important for us to have a real-world experience with this technology.”

550 Solar Panels
Emerson’s 7,800 square foot rooftop installation includes more than 550 solar panels, and is the largest solar array in the state of Missouri. Even so, at peak output it will supply about 16 percent of the data center’s power requirements, and Emerson expects it will take 20 years of operation to fully recover its investment.  

“When you’re competing with coal-fired energy at 5 cents a kilowatt hour, it’s difficult to make renewable energy pay off,” Hassell said. “In our case, the combination of incentives and offsets make the array pay off, but over a long period of time. Emerson isn’t normally in the business of making 20-year ROI investments.”   

Making Renewables Work
In coming years, the data center industry will face growing pressure to find workable ways to integrate renewable energy sources into projects. The demand is being driven by two trends: the growth of corporate social responsbility programs that focus on carbon neutrality, and the potential for federal legislation in the U.S. that will place caps on carbon emissions. 

While data centers aren’t specifically targeted by these initiatives, companies with carbon reduction pledges will find their data centers are among the largest energy users – meaning that sourcing data center power from renewable sources could be a major factor in meeting corporate carbon goals.  

That’s why companies like Emerson and i/o Data Centers – which plans a huge solar array at its Phoenix ONE facility – are investing in solar and looking for approaches that can work.    

Large Arrays Required
“Data centers are a really good candidate for solar power, but the math doesn’t add up right now,” said Jack Pouchet, Director of Energy Initiatives at Emerson Network Power. “To power a data center completely, you need a collector space that’s 8 to 10 times the size of your data center. It gets expensive, and it’s one of the reasons data centers aren’t jumping up and down to install solar.”

But prices are moving in the right direction, Pouchet says. “There’s a glut of PV panels, and the market continues to see declining prices on photovoltaics,” he said.

As prices improve and companies feel more pressure for on-site renewable energy, Pouchet says the geography of data center solar usage may be steered by incentives that alter the economics.

“There are states that are ideal for solar,” he said. “New Jersey, Hawaii, Oregon and California have very attractive utility and state rebates and incentives.”

The Emerson project used SunTechsolar panels and a DC-to-AC photovoltaic inverter from Solectra Renewables. Emerson’s solar array is engineered to survive wind storms of up to 150 miles per hour, as well as major earthquakes - a concern since St. Louis is not far from the New Madrid seismic zone.

The view from under the solar array, which faces south and is angled to capture sunlight.

The view from under the solar array, which faces south and is angled to capture sunlight.

About the Author

Rich Miller is the founder and editor at large of Data Center Knowledge, and has been reporting on the data center sector since 2000. He has tracked the growing impact of high-density computing on the power and cooling of data centers, and the resulting push for improved energy efficiency in these facilities.

Add Your Comments

  • (will not be published)

6 Comments

  1. We've developed highly efficient, "biomass" conversion technology to convert Municipal Waste (biomass) into electricity i.e. 20 tons of "biowaste" produces 3 mWh a day (scalable). We need a partner to help develop our technology so we can offer it to municipalities and Industrial Developers across the Nation and eventually third world countries. We will reduce municipal land fills, cleanup water tables and absorb all CO2 emitted in the process. I'm in the Dallas, Texas area with easy access to your Houston facilities if anyone at Emerson has interest. Investment Payback is less that three years with retained ownership, if desired. Based on ExxonMobile's Global Energy projections and other papers addressing the World's "Peak Oil" Scenario, "Renewable Energy" development is and should be of major concern and of utmost importance. Advances in Renewable Energy could be accelerated if there were a Natural Resource Development Center, funded by a Group of related industry, and tasked with actively searching for and supporting new and innovative technologies to expedite advances in the industry. My technology alone, once operational, could sustain the Center. I give testimony as to how difficult it is to find interest and support for new emerging technology related to such an important need as Renewable Energy. Angle Investors tend to pirate good ideas for personal gain and Big Brother industry have their own agenda and don't want to be bothered with someone else's ideas. A Natural Resource Development Center would encourage innovation and the entrepreneurial Spirit and greatly advance technology development. After reviewing your Corp. Structure, Mr. Charles A. Peters seems like a good target for this correspondence. We have "real" technology that can be implemented anywhere and will make a significant contribution to the cause of Renewable Energy. Thanks for considering this request, Fred Howard fredsbeds@sbcglobal.net 214-236-5640

  2. Frank Reale

    Landfills have been the predominant means of disposing of Municipal Wastes in Australia, but a large proportion of green wastes gets composted. What sort of biomass does this process convert? Would be interested in some detail of operation, sizes and estimated costs. Can it handle general municipal waste as a pyrolisis/gassification plant does?