diff --git a/README.md b/README.md
index 5de89ed..8a44dde 100644
--- a/README.md
+++ b/README.md
@@ -77,6 +77,14 @@ conda install -c conda-forge pyresample
 
 This can solve the [bug: \_\_\_kmpc_for_static_fini](https://github.com/openclimatefix/Open-Source-Quartz-Solar-Forecast/issues/32).
 
+### Logging
+
+The package logs when `run_forecast` is used. This is useful for OCF to determine how the package is being used 
+and how we can make improvements in the future.
+Note that any latitude and longitude is rounded to 2 decimals places for in order to anonymize the data.
+If you would like to disable this logging, you can do so by setting the environment variable `QUARTZ_SOLAR_FORECAST_LOGGING` to `False`.
+
+
 ## Model
 
 Two models are currently available to make predictions.
diff --git a/pyproject.toml b/pyproject.toml
index c6a7a4f..54f10d5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,6 +26,7 @@ dependencies = [
     "uvicorn",
     "pydantic_settings",
     "httpx",
+    "sentry_sdk"
 ]
 
 [project.urls]
diff --git a/quartz_solar_forecast/forecast.py b/quartz_solar_forecast/forecast.py
index a75647b..a5d8fe8 100644
--- a/quartz_solar_forecast/forecast.py
+++ b/quartz_solar_forecast/forecast.py
@@ -6,6 +6,7 @@
 from quartz_solar_forecast.data import get_nwp, make_pv_data
 from quartz_solar_forecast.forecasts import forecast_v1_tilt_orientation, TryolabsSolarPowerPredictor
 from quartz_solar_forecast.pydantic_models import PVSite
+from quartz_solar_forecast.utils.sentry_logging import write_sentry
 
 log = logging.getLogger(__name__)
 
@@ -124,6 +125,11 @@ def run_forecast(
     :return: The PV forecast of the site for time (ts) for 48 hours
     """
 
+    # log usage to sentry, if you dont want to log usage to sentry, you can
+    # 1. set environmental variable QUARTZ_SOLAR_FORECAST_LOGGING='false', or
+    # 2. comment out this line
+    write_sentry({"site": site, "model": model, "ts": ts, "nwp_source": nwp_source})
+
     if model == "gb":
         return predict_ocf(site, None, ts, nwp_source)
               
diff --git a/quartz_solar_forecast/utils/sentry_logging.py b/quartz_solar_forecast/utils/sentry_logging.py
new file mode 100644
index 0000000..0e56917
--- /dev/null
+++ b/quartz_solar_forecast/utils/sentry_logging.py
@@ -0,0 +1,42 @@
+""" Log usage of this package to Sentry """
+
+import sentry_sdk
+from quartz_solar_forecast.pydantic_models import PVSite
+
+import os
+
+quartz_solar_forecast_logging = bool(os.getenv("QUARTZ_SOLAR_FORECAST_LOGGING", True))
+
+SENTRY_DSN = 'https://b2b6f3c97299f81464bc16ad0d516d0b@o400768.ingest.us.sentry.io/4508439933157376'
+sentry_sdk.init(
+        dsn=SENTRY_DSN,
+    )
+
+
+def write_sentry(params):
+    """
+    Log usage of this package to Sentry
+    """
+
+    if not quartz_solar_forecast_logging:
+        return
+
+    try:
+        for key, value in params.items():
+
+            # we want to make sure we don't store the exact location of the site
+            if isinstance(value, PVSite):
+                value.round_latitude_and_longitude()
+
+            # set sentry tag
+            sentry_sdk.set_tag(key, value)
+
+        message = "quartz_solar_forecast is being used"
+
+        if os.getenv("PYTEST_CURRENT_TEST") is not None:
+            message += ": in CI tests"
+
+        sentry_sdk.capture_message(message)
+
+    except Exception as _: # noqa
+        pass