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

# Filling data gaps

> How to diagnose missing months on Completeness and choose the right fix.

<Tip>
  Need help in this area? See [Data Quality FAQ](/platform/data-quality/faq).
</Tip>

When a month shows as **Missing** on [Completeness](/platform/data-quality/completeness), open the gap detail sheet. Nectar suggests a likely cause and a primary next step. Use this guide to work the diagnosis in the right order.

## Start with connection health

If the connection that usually supplies this data needs attention — expired password, MFA challenge, portal error, or deactivated while you still expect collection — **fix the connection first**. Do not wait for the next billing cycle while the connection is broken.

From the gap sheet:

1. Open the related connection (Connections table on site gaps, or **Check connection**).
2. Resolve the status (reconnect, update credentials, reactivate).
3. Re-check Completeness after the next successful sync.

See also [Connections](/platform/data-input/connections) and [Reconnecting](/platform/data-input/reconnecting).

## Then check duplicates and exclusions

Sometimes usage exists on meters marked as duplicates or on superseded accounts, so the active path still shows Missing. Review the **Meters** tab in the gap sheet:

* Confirm duplicate flags and site assignment.
* Ensure the meters you want counted are tracked and on the correct site.

## Read the timeline

| Pattern                                                    | What it usually means                               | What to do                                                                                        |
| ---------------------------------------------------------- | --------------------------------------------------- | ------------------------------------------------------------------------------------------------- |
| Data before **and** after this month                       | Confirmed hole                                      | Upload the bill, enter manually, or ask the site                                                  |
| Data before, nothing after — and the connection is healthy | Waiting for a recent bill **or** collection stopped | If the period is still within the normal billing lag, wait; otherwise check sync and fill the gap |
| Nothing before, data later                                 | Historical lead-in                                  | Upload older bills or confirm collection start dates                                              |
| Nothing in the reporting window                            | No data set up yet                                  | Add a connection, upload, or remove the commodity if it is not applicable                         |

Fuel and waste deliveries are often irregular. An empty month may be expected — confirm whether a delivery should have happened before uploading.

## Actions you can take

From the gap detail sheet (and related pages):

* **Check connection** — fix credentials, MFA, or reactivation
* **Upload bill** — add a missing document via Data Input
* **Enter manually** — record values by hand
* **Contact site** — draft an email to site data owners (when enabled)
* **Site settings** — adjust collection window or expected commodities

## Related

* [Data completeness](/platform/data-quality/completeness) — timeline, cell statuses, gap sheet overview
* [Data Quality FAQ](/platform/data-quality/faq)
* [Data Input troubleshooting](/platform/data-input/troubleshooting)
* [Glossary — Coverage gap](/platform/glossary#coverage-gap)