Open Source

Transparent Methods You Can Trust

Demand-side programs need to scale quickly and credibly, and adapt based on insights from actual performance. But without rapid and reliable measurement, results can be inconsistent, outdated, or disputed.

Open-source methods create a common foundation for impact measurement and valuation. When everyone plays by the same rules, programs move faster and trust grows.

Why Open Source?

Trustworthy

Open methods and data ensure everyone sees how results are measured and valued.

Replicable

Open standards and consistent inputs lead to results that are easy to verify and audit.

Accessible

Freely available code removes black boxes, reduces vendor lock-in, and accelerates innovation.

Our Approach

Recurve is the independent source of truth for demand-side performance.

We believe that when everyone plays by the same rules, is measured on the same scoreboard, and gets paid the same way, demand-side programs can compete and scale as genuine energy resources.

We drove creation of the industry’s leading measurement tools, contributed them to the open-source community, and continue to guide their evolution. Our FLEX platform builds on these methods to deliver results that are fast, secure, insightful, and regulator-ready.

Why Recurve

Open methods are available to everyone. FLEX applies them consistently so programs can scale, vendors can compete fairly, and regulators get results they can stand behind.

FLEX is trusted across the industry to:

  • Scale portfolios of efficiency, demand response, electrification, and flexibility programs
  • Deliver consistency that regulators require and utilities need
  • Provide the security, integration, and reliability for enterprises to run programs efficiently and cost-effectively
  • Enable multi-aggregator programs where vendors compete on results, not relationships
Explore FLEX
FLEX Programs Intervention Model Performance Line Graphs

Core Projects

The Open Standard for Transparent Demand-Side Measurement

OpenDSM

(formerly OpenEEmeter)
  • Supports hourly, daily, and billing data
  • Includes weather and solar irradiance normalization and comparison groups
  • Recognized as a founding project within Linux Foundation Energy
LF Energy

Proven Performance

  • High accuracy verified across residential and non-residential cases, diverse climates, and extreme circumstances (e.g., heatwaves, cold snaps, the COVID pandemic)
  • First DOE-approved platform for validating savings under the IRA’s Home Efficiency Rebates program
  • Foundation for measuring and forecasting 50,000+ heat pump installations in the largest building electrification program in the U.S.
  • Powering California’s Market Access programs for utilities and aggregators
Learn More

The Open-Source Engine for Avoided Costs and Emissions

FLEXvalue

  • Converts energy impacts into dollar value and carbon impact
  • Aligns with state and utility-specific value streams
  • Expanding into the OpenBCA, a new open-source framework for DER cost-effectiveness that implements the guidance of the National Standard Practice Manual for valuation of demand-side resources
Learn More

How it Works

OpenDSM and FLEXvalue set the standards for transparent measurement and valuation.

The FLEX platform applies those methods through automated workflows that transform utility and program data into actionable, trusted results.

  • Automates QA/QC, forecasting, and settlement
  • Delivers outputs directly into planning, operations, and regulatory systems
  • Replaces spreadsheets with streamlined processes
Explore the Platform
Image Placeholder

Learn More