Wärtsilä supplies flexible capacity to integrate wind and solar energy in Oklahoma

Wärtsilä Corporation, Press release 9 October 2014 at 12:30 UTC+2
  • In less than ten years, the installed wind capacity has grown 18-fold in Oklahoma, increasing the need for fast back-up power

Wärtsilä has been contracted to supply a 56 MW Smart Power Generation power plant to the Stillwater Utilities Authority (SUA) in Oklahoma, USA. The contract was signed in September 2014 and the equipment delivery will begin in November 2015.

The power station will be used to balance wind and solar generation in Oklahoma. “When the wind stops blowing and the sun goes down, we need to keep up the load. Quick-starting engines are perfect for this,” SUA’s Director Dan Blankenship said. The plant will also be used for peaking power.

The new plant will replace a 26 MW gas turbine built in the 1950s. The main reason why SUA opted for internal combustion engine (ICE) technology was operational flexibility. “It takes eight hours to start our current capacity. Smart Power Generation can go from start-up to full load in just ten minutes,” Dan Blankenship said. The plant will consist of three Wärtsilä 50SG engines, running on natural gas.

Operational flexibility is also appreciated because of the changing market environment in the area. In March 2014, Southwest Power Pool (SPP), the regional transmission organization, took over the dispatch of electric generation for all regional generators in Oklahoma. SPP determines on a daily basis which units will be operated to meet electricity demand most efficiently and reliably. Stillwater’s former inefficient capacity has been called upon only as spinning reserve.

“With new, fast-reacting capacity, we expect to be dispatched more often. We will rank better in the merit order and get more running hours,” Blankenship said.

Gary Groninger, Business Development Manager for Wärtsilä, said: “This plant will provide maximum operational flexibility and the highest simple-cycle operating efficiency in the industry. The plant will provide unmatched benefits to the Stillwater community for the decades to come.”

Oklahoma has more than 1700 active wind turbines with over 1300 MW capacity, and ranks sixth among all American states. Wind farms provided 14.8 percent of Oklahoma’s electricity in 2013 and can power the equivalent of more than 1,000,000 average American homes. The capacity of grid-connected solar panels is still relatively small, but is growing rapidly – by 133 percent in 2013 alone. (Sources: American Wind Energy Association and Interstate Renewable Energy Council.)

Wärtsilä has years of experience in supporting wind farms with power plants in the 200 MW range in Texas and Colorado. A new 225 MW wind-integrating power station is under construction in Oregon. Wärtsilä’s total capacity in the United States is some 2400 MW.

According to a recent report by the International Energy Agency (IEA), internal combustion engines are a promising technology for supporting wind and solar energy. Comparing different flexibility resources for power systems, IEA says gas-fired ICE power plants are a ”very mature technology” and ”cost-competitive to OCGTs” (Open Cycle Gas Turbines). The IEA notes that “growth in ICE plants actually exceeds that of turbine-based technologies”. According to the IEA, the key asset of engine-based generation is fast starting and ramping capability. The findings were published in IEA’s Energy Technology Perspectives 2014.

Download chart: Installed wind capacity in Oklahoma 2004–2012
Caption: In less than ten years, the installed wind capacity has grown 18-fold in Oklahoma, increasing the need for fast back-up power. Source: US Department of Energy

Download photo: Wärtsilä 50SG engine
Caption: The Wärtsilä 50SG is the largest gas engine in the world. Source: Wärtsilä

For further information please contact:

Gary Groninger
Business Development Manager, Power Plant Sales
Wärtsilä North America, Inc.
Houston, Texas, USA
Tel: +1 931 523 5126

Jukka-Pekka Niemi
General Manager, Marketing
Wärtsilä Energy Solutions 
Tel: +358 10 709 0000

Wärtsilä Power Plants in brief
Wärtsilä Power Plants is a leading global supplier of flexible baseload power plants of up to 600 MW operating on various gaseous and liquid fuels. Our portfolio includes unique solutions for peaking, reserve and load-following power generation, as well as for balancing intermittent power production. Wärtsilä Power Plants also provides LNG terminals and distribution systems. As of 2014, Wärtsilä has 56 GW of installed power plant capacity in 170 countries around the world.

Wärtsilä in brief
Wärtsilä is a global leader in complete lifecycle power solutions for the marine and energy markets. By emphasising technological innovation and total efficiency, Wärtsilä maximizes the environmental and economic performance of the vessels and power plants of its customers. In 2013, Wärtsilä's net sales totalled EUR 4.7 billion with approximately 18,700 employees. The company has operations in more than 200 locations in nearly 70 countries around the world. Wärtsilä is listed on the NASDAQ OMX Helsinki, Finland.