Deepening our investment in Colorado’s clean energy future 

In October 2021, Lightsource bp and Xcel Energy announced a PPA for the development of Sun Mountain Solar, a 293 megawatt solar farm in Pueblo, Colorado. The project will be Lightsource bp’s second in the city with power sales to Xcel, representing a cumulative half billion-dollar private investment in Colorado’s clean power infrastructure. 

  • Site-Build-Timeline-Site-Selection

    Site Selection & preliminary design

  • Site-Build-Timeline-Engagement

    Stakeholder outreach

  • Site-Build-Timeline-Planning

    Permitting & environmental studies

  • Site-Build-Timeline-Conditions

    Land management & biodiversity planning

  • Site-Build-Timeline-Construction

    Final engineering, financing & construction

  • Operation & maintenance

  • Decommissioning & recycling


Lightsource bp has financed, mobilized construction, and will own and operate the facility and deliver the solar energy it generates to Xcel Energy under a long-term power purchase agreement. Xcel Energy provides the energy that powers millions of homes and businesses across eight Western and Midwestern states. Full construction has started, with commercial operation expected by late 2022.

The Sun Mountain power purchase agreement complements Xcel Energy’s broader Colorado Energy Plan to deliver 55% renewable energy to the grid and reduce carbon emissions 60% by 2026.  It also supports Colorado’s clean energy goal to reduce emissions statewide 26% by 2025, 50% by 2030, and 90% by 2050 – creating cleaner and healthier communities across Colorado while contributing to local economies. 

Bighorn Solar, Lightsource bp’s first Pueblo project powering the EVRAZ Rocky Mountain Steel mill, provides an additional 300MW of solar-generated electricity to Xcel Energy.  At both the Sun Mountain and Bighorn solar farms, Lightsource bp is installing and conserving in total over 3,000 acres of shortgrass prairie, creating habitat for wildlife while bolstering the sites’ ability to sequester carbon. 

  • 293MWᴅᴄ
    /200MWᴀᴄ clean energy generation capacity
  • 404,080
    metric tons of CO2 saved per year
  • 87,840
    fuel-burning cars taken off road (equivalent)
  • 53,540
    equivalent US homes powered per year
  • 300
    construction jobs created; the majority local

Information & resources

We’ve put together a collection of resources for anyone who’d like to know more about our Elm Branch solar project – or about solar in general.


Find out more about this project, and what others are saying about it below:


Find out more about our responsible solar approach

Videos of our Sun Mountain Solar project

Here are some project specific updates:


Introducing Sun Mountain Solar

The 298MW Sun Mountain Solar project in Pueblo, Colorado is our second with power sales to Xcel Energy. The project brings Lightsource bp's investment in Colorado's clean power infrastructure to a half billion dollars.


We’ve received lots of interest in our Sun Mountain solar project, so we’ve put together a list of the most commonly asked questions, and their answers.


Get in touch

If you’d like to find out more about this project, email, or fill out the form below. We aim to get back to you within five working days.

In the community

We construct our solar farms with a view to improving soil health, fostering biodiversity, and strengthening local economies. From ecological assessments to community engagement, we do our best to create solar farms that local communities can be proud of.

Learn more about our communities

Take a look at some of our other projects

We work with businesses and communities around the world to create low carbon, solar energy projects that make a difference.

See more of our USA solar projects