diff --git a/place_and_route/build_defs.bzl b/place_and_route/build_defs.bzl
index 6c4c83ae..027742f5 100644
--- a/place_and_route/build_defs.bzl
+++ b/place_and_route/build_defs.bzl
@@ -124,6 +124,10 @@ place_and_route = rule(
             default = "0.69",
             doc = "When performing global placement this is how densely our cells should be packaged on the die parameter is (0-1]",
         ),
+        "power_switching_activity": attr.string(
+            doc = "Assumed input switching activity fraction [0.0-1.0] for probabistic power estimation.",
+            default = "0.5",
+        ),
         "qt_qpa_platform": attr.string(
             default = "minimal",
             doc = "The qt platform to use with OpenROAD.",
diff --git a/place_and_route/private/benchmark.bzl b/place_and_route/private/benchmark.bzl
index 08b09522..4d247be0 100644
--- a/place_and_route/private/benchmark.bzl
+++ b/place_and_route/private/benchmark.bzl
@@ -34,6 +34,7 @@ def benchmark(ctx, open_road_info):
 
     open_road_commands = [
         est_parasitic_cmd,
+        "set_power_activity -input -activity {} -duty 0.5".format(ctx.attr.power_switching_activity),
         "report_power",
         "report_wns",
         "report_tns",
@@ -85,6 +86,7 @@ def benchmark(ctx, open_road_info):
         "cpl=$(cat {log} | awk '/period_min/ {{ cpl=$4; exit }} END {{ print cpl }}');",
         "tot_pow=$(cat {log} | awk '/^Total / {{ total_power=$5 }} END {{ print total_power }}');",
         "int_pow=$(cat {log} | awk '/^Total / {{ intern_power=$2 }} END {{ print intern_power }}');",
+        "leak_pow=$(cat {log} | awk '/^Total / {{ leak_power=$4 }} END {{ print leak_power }}');",
         "swi_pow=$(cat {log} | awk '/^Total / {{ switch_power=$3 }} END {{ print switch_power }}');",
     ]
     cmds.extend([cmd.format(log = command_output.log_file.path) for cmd in awk_cmds])
@@ -115,7 +117,9 @@ def benchmark(ctx, open_road_info):
                 total = struct(
                     internal_watts = "$int_pow",
                     switching_watts = "$swi_pow",
+                    leakage_watts = "$leak_pow",
                     total_watts = "$tot_pow",
+                    estimation_method = "{} probabilistic switching fraction".format(ctx.attr.power_switching_activity),
                 ),
             ),
         ),
diff --git a/place_and_route/private/global_routing.bzl b/place_and_route/private/global_routing.bzl
index 866f10a3..fe13a197 100644
--- a/place_and_route/private/global_routing.bzl
+++ b/place_and_route/private/global_routing.bzl
@@ -68,7 +68,7 @@ foreach layer_adjustment {global_routing_layer_adjustments} {{
         "report_check_types -max_slew -max_capacitance -max_fanout -violators",
         "report_floating_nets -verbose",
         "report_units",
-        "set_power_activity -input -activity 1 -duty 0.5",
+        "set_power_activity -input -activity {} -duty 0.5".format(ctx.attr.power_switching_activity),
     ]
     open_road_commands.extend(generate_power_results(ctx, general_routing_power_results))
     open_road_commands.extend(generate_area_results(general_routing_area_results))
diff --git a/synthesis/power_performance_area.proto b/synthesis/power_performance_area.proto
index 85337a3d..ba4065ce 100644
--- a/synthesis/power_performance_area.proto
+++ b/synthesis/power_performance_area.proto
@@ -194,6 +194,10 @@ message Power {
 
   // Clock tree
   optional PowerBreakdown clock = 6;
+
+  // Description of the method used to estimate power, e.g. probabilistic
+  // switching or a vector power analysis.
+  optional string estimation_method = 7;
 }
 
 message PowerBreakdown {