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Make Confident Development and Interconnection Decisions Across Your Portfolio.

Felix brings ISO-accurate interconnection analysis into a single view — so you can de-risk every project, protect capital, and move your portfolio to power faster.

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>$5B

  • Cost discrepancies identified for customers

100+

  • Developers Use Felix

700+

  • GW Projects Modeled

>97%

  • Accuracy in replication of ISO study results
No matter where your assets sit in the development lifecycle, you have to synthesize fragmented interconnection, capacity, and cost data to make sound decisions across both near-term project execution and long-term portfolio growth.Felix brings ISO-accurate interconnection intelligence into a single platform. You can pinpoint where capacity actually exists, anticipate upgrade costs before they appear in an ISO study, and manage queue risk across your portfolio today — while evaluating future development, expansion, and repowering opportunities with confidence as the grid evolves.

What You Need to Stay Ahead

1. De-Risk Development Decisions.

Make informed decisions about where to develop and which projects to advance by understanding real substation headroom, congestion risk, and upgrade cost exposure. The same insights help you decide where future capacity can be added or expanded — so you protect capital today while guiding smarter build out decisions over time.

2. Know Your Costs Before the ISO Does.

Surprise network upgrade costs sink projects. Felix replicates ERIS and NRIS study methodology so you can see likely interconnection costs and constraints before you’re deep in the queue — and act before a restudy erodes your project economics.

3. Stay Ahead of Queue Dynamics.

Prioritize the signals that matter most. Evaluate how competing projects in the queue affect your sites, model custom scenarios, and re-run full ISO study methodology to understand how the picture changes — giving you the clarity to adjust strategy as the queue moves around you.

4. Plan Portfolio Growth with Confidence.

Understand where headroom and favorable interconnection economics exist across regions and how they’re likely to shift. With capacity and cost intelligence across markets, you can plan today’s projects more confidently while evaluating future development, expansion, and valuation decisions with a clearer view of long-term grid dynamics.

Solutions for IPP Workflows

Headroom Capacity

Identify build-ready opportunity and interconnection risk with real-time substation capacity and upgrade-cost data, so you can prioritize the best sites across your portfolio.

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Local Studies Tool

Toggle local queue assumptions across custom scenarios and re-run full ISO study methodology for fast, accurate interconnection results — and compare scenarios based on competing projects in the queue.

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ISO-Aligned Methodology

Validate projects against the same study process ISOs use. Felix replicates ERIS and NRIS studies (not FCITC approximations) using the same software as ISOs and utilities, including PowerGEM’s TARA and Siemens PTI’s PSS®️E.

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Frequently Asked Questions on Solutions for IPPs

Still have questions?

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What makes Felix different for IPPs?
Felix provides ISO-accurate interconnection intelligence across major ISOs, combined with tools built specifically for siting, queue strategy, and development workflo
ws. Rather than approximations, we replicate the same ERIS and NRIS study methodology ISOs use — so you can see capacity, upgrade costs, and constraints in one view. This enables faster development decisions today while supporting valuation, expansion, and portfolio planning over time.
How accurate is Felix's analysis?
Our results replicate ISO study outcomes with >97% accuracy. We use the same software ISOs and utilities rely on, including PowerGEM's TARA and Siemens PTI's PSS®️E, applied to the latest power flow models for each ISO/utility.
Can Felix help me prioritize across a portfolio of sites?
Yes. Headroom Capacity lets you screen and rank sites across regions using real substation capacity and upgrade-cost data, so you can focus capital on the projects with the fastest, lowest-cost path to power.
Can I model how competing queue projects affect my projects?
Yes. The Local Studies Tool lets you toggle local queue assumptions across custom scenarios and re-run full ISO study methodology, so you can compare outcomes based on what else is in the queue.
How does Felix reduce portfolio risk?
By surfacing interconnection cost and capacity risk before you commit capital. Customers have used GridCertainty to identify over $5B in cost discrepancies and avoid advancing sites with no real transmission capacity — protecting project economics and capital allocation across the portfolio.
Which regions does Felix cover?
You pick which regions / ISOs you want to subscribe to, with pricing per region and discounts for multiple regions. Contact us to confirm current coverage for your markets.

Ready to Develop with Speed, Clarity, and Confidence?

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