diff --git a/src/core/production_factor.jl b/src/core/production_factor.jl
index 51b8c18e8..ab7463016 100644
--- a/src/core/production_factor.jl
+++ b/src/core/production_factor.jl
@@ -72,7 +72,7 @@ function get_production_factor(wind::Wind, latitude::Real, longitude::Real, time
             resource = []
             try
                 @info "Querying Wind Toolkit for resource data ..."
-                r = HTTP.get(url; retries=5)
+                r = HTTP.get(url, ["User-Agent" => "REopt.jl"]; retries=5)
                 if r.status != 200
                     throw(@error("Bad response from Wind Toolkit: $(response["errors"])"))
                 end
diff --git a/src/core/utils.jl b/src/core/utils.jl
index 029050626..1357531f6 100644
--- a/src/core/utils.jl
+++ b/src/core/utils.jl
@@ -461,7 +461,7 @@ function call_pvwatts_api(latitude::Real, longitude::Real; tilt=latitude, azimut
 
     try
         @info "Querying PVWatts for production factor and ambient air temperature... "
-        r = HTTP.get(url, keepalive=true, readtimeout=10)
+        r = HTTP.get(url, ["User-Agent" => "REopt.jl"]; keepalive=true, readtimeout=10)
         response = JSON.parse(String(r.body))
         if r.status != 200
             throw(@error("Bad response from PVWatts: $(response["errors"])"))