Benndale, Mississippi, USA
Cooperative Energy + Wärtsilä

Reference case

Sustainable power generation with the optimal balancing solution

Enabling an increase in variable generation with more flexible capacity that can rapidly start up when needed.

Intermittent renewable energy generation in the United States has seen a staggering 700% increase between 2008 and 2019, with solar and wind generation accounting for around 350 million MWh of power generation in 2019. The subsequent increase in variable generation means that flexibility is increasingly important in the energy system.

Cooperative Energy, a not-for-profit electricity cooperative covering 432,000 homes and businesses in the US state of Mississippi, was looking to upgrade one of its plants in order to help it supply affordable, flexible and reliable power. Wärtsilä’s comprehensive solution comprises a plant powered by two gas-fired Wärtsilä 31SG engine generating sets and covered by a 10-year service agreement.

WhoCooperative energy
What22,7 MW peaking gas power plant
WhereMississippi, USA


This is what we achieved


Flexible power generation to integrate high levels of energy from renewable sources.


Homes and businesses powered in Mississippi.

10 years

Optimised maintenance agreement.

I wanted to be satisfied with the technology and the people behind it, so we visited Wärtsilä’s factory and testing facilities and met the engineers. This is not just about a product, but the people. I needed to be comfortable with everyone involved in design, installation and maintenance. I was very impressed.

Jim Compton, President Emeritus of Cooperative Energy

How we did it

Challenge icon


  • Efficient power generation in a market with increasing levels of renewables
  • Mitigate financial and timing risks in construction
  • Resilient and reliable generation in a hurricane-prone region
  • Maintain the plant and its performance over the lifecycle
Solution icon


  • Full EPC delivery
  • Wärtsilä plant integrated with customer’s system
  • A flexible Wärtsilä 31SG gas power plant with the ability to respond rapidly to continuously changing load patterns of systems with renewables
  • 10-year Wärtsilä Optimised maintenance service agreement
Benefit icon


  • Efficient and flexible power supply with a reduced environmental footprint
  • One EPC supplier with full responsibility for both timelines and costs
  • Fast starting; ability to supply power to key facilities such as hospitals during a natural disaster
  • Ensure optimised plant performance and efficiency over the lifecycle

The main details

Customer Cooperative energy
Type Wärtsilä 31SG peaking gas plant
Where Mississippi, USA
Total output 22,7 MW
Fuel Natural gas
Scope EPC with 10-year maintenance services ageement



Would you like to know more?

Contact us

Contact us

Fill in a contact form and our experts aim to be in contact within 1-2 business days. Contact us »


Read our brochure

Read our product brochure to get all the details.


Find your local office

Find a Wärtsilä office near you.

Related solutions and services

Related materials

Trusted partner to the best companies in the world

Related press releases

Wärtsilä 31SG gas engine generating set awarded German Grid Code compliance certification

Jun 15, 2020, 11:00 by Wärtsilä Corporation

The technology group Wärtsilä was awarded type certification in April 2020 for its highly efficient 12 MWe Wärtsilä 31SG gas fuelled generating set. This is the largest synchronous generating set of this technology globally that has been awarded the unit certificate after full scale testing. This verifies the design and engineering standards as being in full compliance with Germany’s grid code requirements. The testing and certifying party was the classification society DNV GL, the world’s leading classification society.

Germany is the first country in Europe to have implemented generating set certification with detail guidelines for grid code compliance, although other countries have already or are in the process of requiring similar compliance. The German grid connection rules are specified in low, medium, high, and extra high voltage levels, and any power plant connection to the network should comply with these rules.

“Germany is showing the way forward in utilising renewable sources of energy, such as wind and solar, and this strategy aligns with Wärtsilä’s vision of a 100 percent renewable energy future. The intermittent nature of renewable energy increases the need for flexible balancing solutions in the power systems and this is why Wärtsilä’s flexible gas fuelled solutions are an important enabler in the energy transition. Being awarded this German grid code compliance certification brings our vision a further step towards realisation,” says Niklas Doktar, Director, Solution Design, Wärtsilä Energy Business.

Wärtsilä 31SG engine is available from 7.5 to 12 MWe. Certification of the Wärtsilä 31SG places it in a leading market position for 2-stage turbocharged engines. All other gas fuelled Wärtsilä generating sets are currently under certification. 

Image: Wärtsilä 31SG engine generating set


Read more:

Web site: Wärtsilä 31SG engine family
Article: Wärtsilä 31SG - Providing power through rain or shine


For more information, please contact:

Niklas Doktar
Director, Solution Design
Wärtsilä Energy Business
Mob. +358 40 3565025


Mirja-Maija Santala
Manager, Marketing & Communications
Wärtsilä Energy Business
Mob: +358 400 793 827

Wärtsilä Energy Business in brief
Wärtsilä Energy Business leads the transition towards a 100% renewable energy future. We help our customers unlock the value of the energy transition by optimising their energy systems and future-proofing their assets. Our offering comprises flexible power plants, energy management systems, and storage, as well as lifecycle services that ensure increased efficiency and guaranteed performance. Wärtsilä has delivered 72 GW of power plant capacity in 180 countries around the world.

Wärtsilä in brief
Wärtsilä is a global leader in smart technologies and complete lifecycle solutions for the marine and energy markets. By emphasising sustainable innovation, total efficiency and data analytics, Wärtsilä maximises the environmental and economic performance of the vessels and power plants of its customers. In 2019, Wärtsilä’s net sales totalled EUR 5.2 billion with approximately 19,000 employees. The company has operations in over 200 locations in more than 80 countries around the world. Wärtsilä is listed on Nasdaq Helsinki.

Wärtsilä Energy. Let's connect.