diff --git a/.gitignore b/.gitignore
index 5d381cc..bcf33c9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
+.idea
+
 # ---> Python
 # Byte-compiled / optimized / DLL files
 __pycache__/
@@ -15,7 +17,6 @@ dist/
 downloads/
 eggs/
 .eggs/
-lib/
 lib64/
 parts/
 sdist/
@@ -159,4 +160,3 @@ cython_debug/
 #  and can be added to the global gitignore or merged into this file.  For a more nuclear
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
 #.idea/
-
diff --git a/lib/__init__.py b/lib/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/lib/cddis_fetch.py b/lib/cddis_fetch.py
new file mode 100644
index 0000000..55902d4
--- /dev/null
+++ b/lib/cddis_fetch.py
@@ -0,0 +1,86 @@
+import datetime
+import subprocess
+import sys
+import tempfile
+from pathlib import Path
+
+import chromedriver_autoinstaller
+import requests
+from selenium import webdriver
+from selenium.webdriver import Keys
+from selenium.webdriver.chrome.options import Options
+from selenium.webdriver.common.by import By
+from selenium.webdriver.support import expected_conditions as EC
+from selenium.webdriver.support.ui import WebDriverWait
+
+IONEX_BASE_URL = 'https://cddis.nasa.gov/archive/gnss/products/ionex/'
+
+
+def fetch_latest_ionex(username: str, password: str):
+    now = datetime.date.today()
+    url = IONEX_BASE_URL + str(now.year)
+
+    chromedriver_autoinstaller.install()
+    options = Options()
+    options.add_argument('--headless=new')
+    driver = webdriver.Chrome(options=options)
+    driver.get(url)
+
+    # Login
+    username_field = WebDriverWait(driver, 30).until(EC.presence_of_element_located((By.ID, "username")))
+    username_field.clear()
+    username_field.send_keys(username)
+    password_field = WebDriverWait(driver, 10).until(EC.presence_of_element_located((By.ID, "password")))
+    password_field.clear()
+    password_field.send_keys(password)
+    password_field.send_keys(Keys.RETURN)
+
+    # Wait until we're redirected to the right page.
+    WebDriverWait(driver, 30).until(EC.visibility_of_element_located((By.ID, "parDirTextContainer")))
+
+    # Get the days in the year.
+    day_elements = driver.find_elements(By.XPATH, '//div[@class="archiveDir"]/div[@class="archiveDirTextContainer"]/a[@class="archiveDirText"]')
+    day_urls = [element.get_attribute('href') for element in day_elements]
+
+    # Load the latest day.
+    driver.get(day_urls[-1])
+
+    # Find our file.
+    file_elements = driver.find_elements(By.XPATH, '//a[@class="archiveItemText"]')
+    file_urls = [element.get_attribute('href') for element in file_elements]
+    found_url = None
+    for u in file_urls:
+        parts = u.split('/')
+        if parts[-1].startswith('c2pg'):
+            found_url = u
+            break
+    if found_url is None:
+        print('Did not find c2pg')
+        sys.exit(1)
+
+    # Download our file.
+    auth_cookie = None
+    for cookie in driver.get_cookies():
+        if cookie['name'] == 'ProxyAuth':
+            auth_cookie = cookie['value']
+            break
+    if auth_cookie is None:
+        print('Did not find ProxyAuth cookie')
+        sys.exit(1)
+
+    driver.close()
+    del driver
+
+    # Download data.
+    zip_data_r = requests.get(found_url, cookies={'ProxyAuth': auth_cookie})
+    zip_data_r.raise_for_status()
+
+    # Read data.
+    tmp_file = tempfile.NamedTemporaryFile()
+    tmp_file.write(zip_data_r.content)
+    tmp_dir = tempfile.TemporaryDirectory()
+    subprocess.run(["7z", "e", tmp_file.name, f"-o{tmp_dir.name}"], check=True, stdout=subprocess.PIPE)
+    p = Path(tmp_dir.name)
+    target_file = list(p.iterdir())[-1]
+    data = target_file.read_text()
+    return data
diff --git a/lib/tecmap.py b/lib/tecmap.py
new file mode 100644
index 0000000..9aba974
--- /dev/null
+++ b/lib/tecmap.py
@@ -0,0 +1,68 @@
+import re
+from datetime import datetime
+
+import cartopy.crs as ccrs
+import matplotlib.pyplot as plt
+import numpy as np
+
+"""
+https://github.com/daniestevez/jupyter_notebooks/blob/master/IONEX.ipynb
+"""
+
+
+def parse_ionex_datetime(s: str):
+    match = re.match(r'\s*(\d{4})\s*(\d{1,2})\s*(\d{1,2})\s*(\d{1,2})\s*(\d{1,2})\s*(\d{1,2})', s)
+    if match:
+        year, month, day, hour, minute, second = map(int, match.groups())
+        return datetime(year, month, day, hour, minute, second)
+    else:
+        raise ValueError("Invalid date format")
+
+
+def parse_map(tecmap, exponent=-1):
+    tecmap = re.split('.*END OF TEC MAP', tecmap)[0]
+    return np.stack([np.fromstring(l, sep=' ') for l in re.split('.*LAT/LON1/LON2/DLON/H\\n', tecmap)[1:]]) * 10 ** exponent
+
+
+def get_tecmaps(ionex: str):
+    for tecmap in ionex.split('START OF TEC MAP')[1:]:
+        lines = tecmap.split('\n')
+        epoch = lines[1].strip() if len(lines) > 1 else None
+        yield parse_map(tecmap), epoch
+
+
+def plot_tec_map(tecmap, lon_range: list, lat_range: list):
+    proj = ccrs.PlateCarree()
+    f, ax = plt.subplots(1, 1, subplot_kw=dict(projection=proj))
+
+    # Create arrays of latitudes and longitudes to match the geographical grid of the TEC map data.
+    # This is hard coded and should never change.
+    lat = np.arange(-87.5, 87.5, 2.5)
+    lon = np.arange(-180, 180, 2.5)
+
+    # Create a mask for the data in the lat/lon range
+    lon_mask = (lon >= lon_range[0]) & (lon <= lon_range[1])
+    lat_mask = (lat >= lat_range[0]) & (lat <= lat_range[1])
+    mask = np.ix_(lat_mask, lon_mask)
+
+    # Select only the data in the lat/lon range
+    tecmap_ranged = tecmap[mask]
+
+    # Plot the TEC map
+    h = plt.imshow(tecmap_ranged, cmap='viridis', vmin=0, vmax=100, extent=(lon_range[0], lon_range[1], lat_range[0], lat_range[1]), transform=proj)
+
+    # Make graph pretty
+    # ax.coastlines()
+    # plt.title('VTEC map')
+    # divider = make_axes_locatable(ax)
+    # ax_cb = divider.new_horizontal(size='5%', pad=0.1, axes_class=plt.Axes)
+    # f.add_axes(ax_cb)
+    # cb = plt.colorbar(h, cax=ax_cb)
+    # plt.rc('text', usetex=True)
+    # cb.set_label('TECU ($10^{16} \\mathrm{el}/\\mathrm{m}^2$)')
+    # plt.show()
+
+    # Deallocate
+    plt.close()
+
+    return tecmap_ranged
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..b2d72d6
--- /dev/null
+++ b/main.py
@@ -0,0 +1,68 @@
+import logging
+import os
+import sys
+import time
+
+import numpy as np
+import paho.mqtt.client as mqtt
+
+from lib.cddis_fetch import fetch_latest_ionex
+from lib.tecmap import get_tecmaps, plot_tec_map
+
+logging.basicConfig(level=logging.INFO)
+
+MQTT_BROKER_HOST = os.getenv('MQTT_BROKER_HOST', "")
+MQTT_BROKER_PORT = int(os.getenv('MQTT_BROKER_PORT', 1883))
+MQTT_CLIENT_ID = os.getenv('MQTT_CLIENT_ID', "space_weather")
+MQTT_USERNAME = os.getenv('MQTT_USERNAME', "")
+MQTT_PASSWORD = os.getenv('MQTT_PASSWORD', "")
+MQTT_TOPIC_PREFIX = os.getenv('MQTT_TOPIC_PREFIX', "space-weather")
+
+LAT_RANGE_MIN = os.getenv('LAT_RANGE_MIN')
+LAT_RANGE_MAX = os.getenv('LAT_RANGE_MAX')
+LON_RANGE_MIN = os.getenv('LON_RANGE_MIN')
+LON_RANGE_MAX = os.getenv('LON_RANGE_MAX')
+if not LAT_RANGE_MIN or not LAT_RANGE_MAX or not LON_RANGE_MIN or not LON_RANGE_MAX:
+    logging.critical('Must set LAT_RANGE_MIN, LAT_RANGE_MAX, LON_RANGE_MIN, and LON_RANGE_MAX environment variables')
+    sys.exit(1)
+
+CDDIS_USERNAME = os.getenv('CDDIS_USERNAME')
+CDDIS_PASSWORD = os.getenv('CDDIS_PASSWORD')
+if not CDDIS_USERNAME or not CDDIS_PASSWORD:
+    logging.critical('Must set CDDIS_USERNAME and CDDIS_PASSWORD environment variables')
+    sys.exit(1)
+
+client = mqtt.Client(client_id=MQTT_CLIENT_ID)
+if MQTT_USERNAME and MQTT_PASSWORD:
+    client.username_pw_set(MQTT_USERNAME, MQTT_PASSWORD)
+    logging.info("Username and password set.")
+client.will_set(MQTT_TOPIC_PREFIX + "/status", payload="Offline", qos=1, retain=True)  # set LWT
+client.connect(MQTT_BROKER_HOST, port=MQTT_BROKER_PORT)
+client.loop_start()
+
+
+def publish(topic: str, msg):
+    topic_expanded = MQTT_TOPIC_PREFIX + '/' + topic
+    result = client.publish(topic_expanded, msg)
+    status = result[0]
+    if status == 0:
+        logging.info(f"Sent {msg} to topic {topic_expanded}")
+    else:
+        logging.error(f"Failed to send message to topic {topic_expanded}")
+
+
+def main():
+    while True:
+        logging.info('Fetching latest IONEX data')
+        ionex_data = fetch_latest_ionex(CDDIS_USERNAME, CDDIS_PASSWORD)
+        tec_data = []
+        for tecmap, epoch in get_tecmaps(ionex_data):
+            avg_tec = np.mean(plot_tec_map(tecmap, [float(LON_RANGE_MIN), float(LON_RANGE_MAX)], [float(LAT_RANGE_MIN), float(LAT_RANGE_MAX)]))
+            tec_data.append(avg_tec)
+        daily_avg = round(np.mean(tec_data), 1)
+        publish('vtec', daily_avg)
+        time.sleep(1800)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..ef24e5b
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,7 @@
+paho-mqtt==1.5.0
+chromedriver-autoinstaller==0.6.4
+selenium==4.23.1
+requests==2.32.3
+matplotlib==3.9.2
+cartopy==0.23.0
+numpy==2.0.1
\ No newline at end of file
diff --git a/service/vtec.service b/service/vtec.service
new file mode 100644
index 0000000..a393f7e
--- /dev/null
+++ b/service/vtec.service
@@ -0,0 +1,14 @@
+[Unit]
+Description=Space Weather VTEC
+After=network.target
+
+[Service]
+Type=simple
+User=homeassistant
+EnvironmentFile=/etc/secrets/space-weather
+ExecStart=/srv/space-weather/venv/bin/python /srv/space-weather/ha-noaa-space-weather-sensor/main.py
+Restart=on-failure
+RestartSec=5s
+
+[Install]
+WantedBy=multi-user.target