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

# Green Power Overview

> Onsite and offsite green power metrics & calculations.

**Green Power** metrics are calculated in full accordance with the **Greenhouse Gas (GHG) Protocol**, including onsite & offsite green power totals across properties and portfolios.

## Performance Metrics

**Green power** metrics are critical for accurately reporting both location- and market-based emissions. These metrics can be tracked across multiple levels, including onsite and offsite totals, as well as across disaggregated views.

| Green Power   | Definition                                                                              |
| :------------ | --------------------------------------------------------------------------------------- |
| Offsite Total | The sum of all purchased, exported, and arbitraged green power.                         |
| Onsite Total  | Electricity that is generated and used onsite for which RECs are owned.                 |
| Purchased     | Electricity associated with offsite green power purchases.                              |
| Exported      | Electricity that is generated onsite & exported for which RECs are owned or arbitraged. |
| Arbitraged    | Electricity that is generated onsite & used or exported for which RECs are arbitraged.  |

Each metric depends on the ownership status of the renewable energy certificates (RECs) associated with the purchased, generated, consumed, or exported green power.

**The following diagram shows how green power is classified based on REC ownership.**

<Note>
  When adding new onsite renewable meters, the default REC ownership status is unknown. Users must enter REC ownership status for all onsite generated electricity consumed and exported to fully account for green power and market-based emissions ([learn more](https://docs.abisko.io/performance/green-power-manage#managing-rec-ownership)).
</Note>

<Frame>
  <img src="https://mintcdn.com/abisko/ApuwuM73PyfYllzn/images/GREEN-POWER-DIAGRAM.png?fit=max&auto=format&n=ApuwuM73PyfYllzn&q=85&s=446c60d837f6d6d5898043ec2f980b11" alt="GREEN POWER DIAGRAM" width="2572" height="1498" data-path="images/GREEN-POWER-DIAGRAM.png" />
</Frame>

<Warning>
  ESPM does not count onsite generated electricity that is consumed as green power if the REC ownership status is unknown, however it does apply this to market-based emissions reductions.
</Warning>

## Onsite Green Power

Onsite green power metrics are derived from onsite renewable wind and solar meters that generate electricity that is used onsite or exported to the grid.

### Methodology

The following methodology is used to calculate green power metrics based on onsite generated renewable electricity.

<Steps>
  <Step title="All onsite solar and wind meters associated with a space type are collected">
    * For whole building performance metrics all **in-metric** meters are used.
    * For a space type (e.g. common areas) all meters assigned to that space type are used.
  </Step>

  <Step title="Meter entries are broken down into daily values">
    Onsite renewable meters have separate entries for tracking energy that is used onsite and exported to the grid. Each entry is broken down into daily values.
  </Step>

  <Step title="REC entries are collected and broken down into daily values">
    Onsite renewable meters independently track REC ownership statuses for energy that is used onsite and exported to the grid. Each REC entry is broken down into daily values to enable tracking of REC ownership status for each day.
  </Step>

  <Step title="Daily meter entries and REC ownership statuses are matched for each day">
    Daily energy consumption and exported values are matched to their corresponding REC ownership statuses for each day of every entry.

    e.g. Sample table of matching daily values across energy & REC meter entries

    | Date       | Energy - Used | REC Ownership | Energy - Exported | REC Ownership |
    | ---------- | ------------- | ------------- | ----------------- | ------------- |
    | 5/30/2025  | 33,000 kWh    | Owned         | 10,000 kWh        | Owned         |
    | 5/31/2025  | 33,000 kWh    | Owned         | 10,000 kWh        | Owned         |
    | 6/1/2025   | 27,500 kWh    | Sold          | 15,000 kWh        | Arbitraged    |
    | 6/2/2025   | 27,500 kWh    | Sold          | 15,000 kWh        | Arbitraged    |
    | ...        |               |               |                   |               |
    | 12/31/2025 | 5,250 kWh     | Arbitraged    | 15,000 kWh        | Sold          |
  </Step>

  <Step title="Daily green power values are calculated">
    For each day, green power values are determined based on the REC ownership status using the diagram above.

    <Warning>
      Any energy that is generated and used onsite for which RECs are UNKNOWN or SOLD is treated as non-renewable grid electricity with grid emissions, per GHG Protocol guidelines.
    </Warning>

    **Energy - Used Onsite**

    * If REC is owned **→** counts as **Green Power - Onsite**
    * If REC is arbitraged **→** counts as **Green Power - Offsite** and **Green Power - Arbitraged**
    * If REC is sold or unknown **→** counts as **Non-Renewable Grid Electricity**

    **Energy - Exported to Grid**

    * If REC is owned **→** counts as **Green Power - Offsite** and **Green Power - Exported**
    * If REC is arbitraged **→** counts as **Green Power - Offsite** and **Green Power - Exported**
    * If REC is sold **→** does not count toward any metric
  </Step>

  <Step title="Daily values are rolled up into monthly values">
    After daily values are assessed based on REC ownership status, all values are rolled up into corresponding monthly values for **Green Power - Onsite, Green Power - Offsite, Green Power - Arbitraged, Green Power - Exported, Non-Renewable Grid Electricity**
  </Step>

  <Step title="Monthly values are aggregated over rolling 12-month periods">
    Monthly values are rolled up to provide annual metrics for every 12-month reporting period.
  </Step>
</Steps>

***

## Offsite Green Power

### Methodology

The following methodology is used to calculate total **Green Power - Offsite** performance metrics.

<Steps>
  <Step title="All green power purchase entries are collected">
    <Note>
      All tracked green power purchases are assumed, by definition, to include ownership of the associated renewable energy certificates (RECs).
    </Note>
  </Step>

  <Step title="Entries are normalized into common units & calendar months">
    * If an entry is based on a fixed purchase amount, that amount is normalized based on the start and end dates of the entry.
    * If the entry is based on a percentage of the consumption associated with one or more meters, then the meter consumption values of all selected meters are normalized over the purchase period, aggregated across relevant meters and then multiplied by the percentage entered for the entry.
  </Step>

  <Step title="Monthly values are aggregated over rolling 12-month periods">
    Monthly normalized values are rolled up across all purchases to provide annual green power values for every 12-month reporting period.
  </Step>

  <Step title="Monthly & annual values are combined with other offsite green power">
    The following values associated with onsite renewable meters are combined with green power purchases to yield total **Green Power - Offsite** performance metrics:

    * Onsite generated green power that is used for which RECs are arbitraged
    * Onsite generated green power that is exported for which RECs are owned or arbitraged
  </Step>
</Steps>

## Tracking Performance Metrics

Users can analyze green power trends across properties and portfolios.

### Portfolio Level

1. **Portfolio → Portfolio Trends → Green Power**
   * Dedicated dashboard for green power trends across properties and portfolios
2. **Portfolio → Portfolio Trends → Energy**
   * Annual portfolio-level green power trends
3. **Portfolio → Property Trends → Energy (Dropdown: Green Power)**
   * Annual property-level green power trends

### Property Level

2. **Property → Annual Trends**
   * Annual green power trends

### EXCEL Reports

2. **Portfolio → Reports → Performance**
   * Portfolio Performance & Data Quality Report