Fix docs for EU changes

Author: ajdonnison

docs/source/configuration.rst

@@ -5,15 +5,18 @@ Configuration
 Accounts
 --------
 
-ISONE and the EU each require a username and password to collect data.
-You can register for an ISONE account here (http://www.iso-ne.com/participate/applications-status-changes/access-software-systems#data-feeds) and an EU ENTSOe account here (https://transparency.entsoe.eu/).
+ISONE requires a username and password to collect data.
+You can register for an ISONE account here (http://www.iso-ne.com/participate/applications-status-changes/access-software-systems#data-feeds)
+
 
 Then, set your usernames and passwords as environment variables:
 
     export ISONE_USERNAME=myusername1
     export ISONE_PASSWORD=mysecret1
-    export ENTSOe_USERNAME=myusername2
-    export ENTSOe_PASSWORD=mypassword2
+
+The EU (ENTSOe) REST API requires a security token.  You must first sign up for an account and then get your security token from here (https://transparency.entsoe.eu/).  To use the token set as an environment variable as follows:
+
+    export ENTSOe_SECURITY_TOKEN=token
 
 The EIA API requires an API key. You can apply for a key here (https://www.eia.gov/opendata/register.cfm). To use the key, set an environment variable as follows: