> ## Documentation Index
> Fetch the complete documentation index at: https://documentation.kodelabs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Key concepts

> A quick orientation to EnerG terminology, with links to the concept pages that explain each idea in depth

This page is your map to EnerG language in <Tooltip tip="KODE OS is the platform that connects building systems, apps, and data across your portfolio.">KODE OS</Tooltip>. Each term below links to a concept page that explains the idea in full. You will see these terms across the [portfolio and building views](/products/energ/get-started/navigation).

## The data that powers EnerG

EnerG runs on two data streams. Monthly **utility bills** drive portfolio rankings, dashboards, targets, and budgets. High-frequency **interval reads** support granular charts, forecasting, and meter-level modeling.

A **data source** is any path that brings that data in, such as <Tooltip tip="Arcadia connects to utility provider accounts and retrieves billing and usage data for connected sites.">Arcadia</Tooltip>, CSV uploads, manual entry, or a KODE OS interval feed. A **meter** is the device or account boundary each stream reports against.

For the full picture of streams, meters, service types, and how EnerG calendarizes bills, see [Data sources and meters](/products/energ/concepts/data-and-meters). Interval reads from KODE OS are cleaned through [interval data normalization](/products/energ/concepts/interval-data-normalization) before charts and models use them.

## Trusting the numbers

<Tooltip tip="Data completeness is a score from 0% to 100% that measures billed coverage from each meter's service start through today.">Data completeness</Tooltip> is the trust signal behind every metric. Gaps and overlaps lower the score, and buildings below your threshold drop out of rankings until coverage recovers.

See [Data completeness](/products/energ/concepts/data-completeness) for how the score works and what moves it.

## Comparing buildings fairly

Benchmarking normalizes usage by area so buildings of different sizes compare fairly. **Energy Use Intensity** (<Tooltip tip="Energy Use Intensity (EUI) is annual energy divided by floor area.">EUI</Tooltip>), **Water Use Intensity** (<Tooltip tip="Water Use Intensity (WUI) is water consumption normalized by floor area.">WUI</Tooltip>), and carbon intensity are the core metrics.

See [Benchmarking and intensity metrics](/products/energ/concepts/benchmarking-and-intensity) for how rankings and percentiles work.

## Measuring change over time

A **baseline** is a historical reference window you measure future usage against. **Weather normalization** adjusts that comparison for hot and cold years using degree days, so you can separate real savings from weather swings.

See [Baselines and weather normalization](/products/energ/concepts/baselines-and-weather-normalization).

## Verifying and forecasting savings

<Tooltip tip="Measurement and Verification (M&V) confirms that savings from energy projects are real, using agreed methods and data.">Measurement and verification (M\&V)</Tooltip> follows <Tooltip tip="The International Performance Measurement and Verification Protocol (IPMVP) defines standard approaches for quantifying energy savings.">IPMVP</Tooltip> practice to confirm savings are real. Models regress energy against weather and other drivers, then project usage forward.

See [Energy modeling and M\&V](/products/energ/concepts/energy-modeling).

## Planning spend and reducing carbon

Energy **budgets** track plan against actual spend, and **accruals** estimate usage for months that lack final bills. **Capital planning** models the measures and scenarios that reshape future budgets.

See [Budgets and capital planning](/products/energ/concepts/budgets-and-capital-planning) and [Emissions accounting](/products/energ/concepts/emissions-accounting) for the carbon side.

## Explore the concepts

<CardGroup cols={2}>
  <Card title="Data sources and meters" icon="gauge" href="/products/energ/concepts/data-and-meters" arrow={true} cta="Read">
    Utility bills, interval reads, meters, service types, and calendarization.
  </Card>

  <Card title="Interval normalization" icon="filter" href="/products/energ/concepts/interval-data-normalization" arrow={true} cta="Read">
    How irregular interval reads become clean 15-minute values.
  </Card>

  <Card title="Data completeness" icon="percent" href="/products/energ/concepts/data-completeness" arrow={true} cta="Read">
    How EnerG scores billed coverage and why it gates benchmarking.
  </Card>

  <Card title="Benchmarking" icon="chart-column" href="/products/energ/concepts/benchmarking-and-intensity" arrow={true} cta="Read">
    EUI, WUI, and GHG intensity, plus how rankings and percentiles work.
  </Card>

  <Card title="Baselines and weather" icon="chart-line" href="/products/energ/concepts/baselines-and-weather-normalization" arrow={true} cta="Read">
    Reference windows, degree days, and weather-normalized comparisons.
  </Card>

  <Card title="Energy modeling" icon="activity" href="/products/energ/concepts/energy-modeling" arrow={true} cta="Read">
    IPMVP options, adjusted baselines, model fit, and forecasting.
  </Card>

  <Card title="Budgets and capital" icon="dollar-sign" href="/products/energ/concepts/budgets-and-capital-planning" arrow={true} cta="Read">
    Predicted versus actual, accruals, measures, curves, and scenarios.
  </Card>
</CardGroup>