FlexGen to build largest energy storage system in Texas co-located with solar

June 20, 2018
LinkedIn
Twitter
Reddit
Facebook
Email
The 180MW Upton 2 Solar Power Plant in Texas. Credit: Vistra Energy

Texas IPP Vistra Energy has contracted energy storage integrator FlexGen to install a 10MW / 42MWh energy storage system (ESS) at the 180MW Upton 2 Solar Power Plant in Texas.   

The lithium-ion storage system, which uses FlexGen’s Hybrid OS software, will be completed in late 2018. It will be the largest storage project in Texas and the seventh largest in the US.

“Vistra is leading our country’s transformation toward a reliable, low cost, sustainable energy mix and we’re thrilled to be supporting its storage strategy,” said Josh Prueher, FlexGen CEO. “The power grid of the future will see energy storage integrated on site with solar, wind, and gas generation, and the Upton solar plus storage project is a trailblazing example.”

FlexGen is backed by Altira Group, General Electric (GE) and Caterpillar. Its storage system will be used to store solar power generated during the day and deliver it to customers during evening hours when demand is greatest, improving grid reliability.

This article requires Premium SubscriptionBasic (FREE) Subscription

Try Premium for just $1

  • Full premium access for the first month at only $1
  • Converts to an annual rate after 30 days unless cancelled
  • Cancel anytime during the trial period

Premium Benefits

  • Expert industry analysis and interviews
  • Digital access to PV Tech Power journal
  • Exclusive event discounts

Or get the full Premium subscription right away

Or continue reading this article for free

24 March 2026
Dallas, Texas
The Energy Storage Summit USA is the only place where you are guaranteed to meet all the most important investors, developers, IPPs, RTOs and ISOs, policymakers, utilities, energy buyers, service providers, consultancies and technology providers in one room, to ensure that your deals get done as efficiently as possible. Book your ticket today to join us in 2026!
15 September 2026
San Diego, USA
You can expect to meet and network with all the key industry players again in 2025 from major US asset owners, operators, RTOs and ISOs, optimizers, software and analytics providers, technical consultancies, O&M technology providers and more.

Read Next

February 20, 2026
A flurry of BESS project news from big-name players in Western Europe in the run-up to the Energy Storage Summit next week, with Neoen, Statkraft, Zenobē and Infranode moving projects forward in Germany, Ireland, the UK and Denmark. Highlights include a 15-year toll between Drax and Zenobē, and multiple 4-hour duration systems.
February 19, 2026
In this US news roundup, CC Power signs an agreement with Hydrostor for 400MWh of its Willow Rock LDES project, PowerSecure builds microgrids in New Mexico, and ESS Inc acquires VoltStorage.
February 18, 2026
IPP Lydian Energy has secured US$689 million in financing for two solar projects and a battery energy storage system (BESS) project in New Mexico, Texas, and Utah, US.
February 18, 2026
The US Treasury’s interim FEOC guidance has outlined “Material Assistance” provisions, which rely heavily on existing safe harbour calculations.
February 17, 2026
Residential energy storage startup Base Power and utility El Paso Electric Company (EPE) have announced a new residential distributed energy resource (DER) pilot programme in Texas, US.