diff --git a/pyproject.toml b/pyproject.toml
index 78973b9..8e17288 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "opower"
-version = "0.0.17"
+version = "0.0.18"
 license = {text = "Apache-2.0"}
 authors = [
     { name="tronikos", email="tronikos@gmail.com" },
diff --git a/src/opower/opower.py b/src/opower/opower.py
index 0d3de2d..628d08a 100644
--- a/src/opower/opower.py
+++ b/src/opower/opower.py
@@ -132,6 +132,8 @@ def __init__(
         self, session: aiohttp.ClientSession, utility: str, username: str, password: str
     ) -> None:
         """Initialize."""
+        # Note: Do not modify default headers since Home Assistant that uses this library needs to use
+        # a default session for all integrations. Instead specify the headers for each request.
         self.session = session
         self.utility: type[UtilityBase] = _select_utility(utility)
         self.username = username
diff --git a/src/opower/utilities/exelon.py b/src/opower/utilities/exelon.py
index f9fe676..ee2b55a 100644
--- a/src/opower/utilities/exelon.py
+++ b/src/opower/utilities/exelon.py
@@ -32,7 +32,9 @@ async def async_login(
     ) -> str:
         """Login to the utility website and authorize opower."""
         async with session.get(
-            "https://" + cls.login_domain() + "/Pages/Login.aspx?/login"
+            "https://" + cls.login_domain() + "/Pages/Login.aspx?/login",
+            headers={"User-Agent": USER_AGENT},
+            raise_for_status=True,
         ) as resp:
             result = await resp.text()
         # transId = "StateProperties=..."
@@ -90,7 +92,7 @@ async def async_login(
             headers={"User-Agent": USER_AGENT},
             raise_for_status=True,
         ) as resp:
-            result = await resp.text(encoding = "utf-8")
+            result = await resp.text(encoding="utf-8")
 
         async with session.post(
             "https://"