Update data_fetcher.py

data_fetcher.py

@@ -10,7 +10,7 @@ if not NREL_API_KEY:
 
 def fetch_nrel_data():
     """Fetch real-time hydrogen station data from NREL API."""
-    url = f"https://developer.nrel.gov/api/hydrogen/v1/stations.json?api_key={L0l8YMg3shJjkOS9kBAUCsbDglzJ0uYd8wMCNBdT}"
+    url = f"https://developer.nrel.gov/api/hydrogen/v1/stations.json?api_key={NREL_API_KEY}"
 
     try:
         response = requests.get(url, timeout=10)  # Timeout added for reliability