created empty charts widget.

lib/pages/analytics/modules/energy_management/widgets/total_energy_consumption_chart_box.dart

@@ -3,6 +3,7 @@ import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:syncrow_web/pages/analytics/modules/energy_management/blocs/total_energy_consumption/total_energy_consumption_bloc.dart';
 import 'package:syncrow_web/pages/analytics/modules/energy_management/widgets/chart_title.dart';
 import 'package:syncrow_web/pages/analytics/modules/energy_management/widgets/total_energy_consumption_chart.dart';
+import 'package:syncrow_web/pages/analytics/widgets/analytics_chart_empty_state_widget.dart';
 import 'package:syncrow_web/pages/analytics/widgets/analytics_error_widget.dart';
 import 'package:syncrow_web/pages/analytics/widgets/charts_loading_widget.dart';
 import 'package:syncrow_web/utils/style.dart';
@@ -41,7 +42,16 @@ class TotalEnergyConsumptionChartBox extends StatelessWidget {
             const SizedBox(height: 20),
             const Divider(),
             const SizedBox(height: 20),
-            TotalEnergyConsumptionChart(chartData: state.chartData),
+            Visibility(
+              visible: state.chartData.isNotEmpty,
+              replacement: AnalyticsChartEmptyStateWidget(
+                isLoading: state.status == TotalEnergyConsumptionStatus.loading,
+                isError: state.status == TotalEnergyConsumptionStatus.failure,
+                isInitial: state.status == TotalEnergyConsumptionStatus.initial,
+                errorMessage: state.errorMessage,
+              ),
+              child: TotalEnergyConsumptionChart(chartData: state.chartData),
+            ),
           ],
         ),
       ),

lib/pages/analytics/widgets/analytics_chart_empty_state_widget.dart

@@ -0,0 +1,80 @@
+import 'package:flutter/material.dart';
+import 'package:syncrow_web/common/widgets/app_loading_indicator.dart';
+import 'package:syncrow_web/utils/color_manager.dart';
+import 'package:syncrow_web/utils/extension/build_context_x.dart';
+
+class AnalyticsChartEmptyStateWidget extends StatelessWidget {
+  const AnalyticsChartEmptyStateWidget({
+    this.isLoading = false,
+    this.isError = false,
+    this.isInitial = false,
+    this.errorMessage,
+    this.noDataMessage = 'No data to display',
+    this.initialMessage = 'Please select a space to see data',
+    super.key,
+  });
+
+  final bool isLoading;
+  final bool isError;
+  final bool isInitial;
+  final String? errorMessage;
+  final String noDataMessage;
+  final String initialMessage;
+
+  @override
+  Widget build(BuildContext context) {
+    return Expanded(
+      child: isLoading
+          ? const Center(
+              child: AppLoadingIndicator(),
+            )
+          : isError
+              ? _buildState(
+                  context,
+                  icon: Icons.error_outline,
+                  message: errorMessage ?? 'Something went wrong',
+                  color: ColorsManager.red,
+                )
+              : isInitial
+                  ? _buildState(
+                      context,
+                      icon: Icons.filter_list,
+                      message: initialMessage,
+                    )
+                  : _buildState(
+                      context,
+                      icon: Icons.bar_chart,
+                      message: noDataMessage,
+                    ),
+    );
+  }
+
+  Widget _buildState(
+    BuildContext context, {
+    required IconData icon,
+    required String message,
+    Color? color,
+  }) {
+    final disabledColor = context.theme.disabledColor;
+    return Center(
+      child: Column(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          Icon(
+            icon,
+            size: 48,
+            color: color ?? disabledColor,
+          ),
+          const SizedBox(height: 16),
+          SelectableText(
+            message,
+            style: context.textTheme.bodyMedium?.copyWith(
+              color: color ?? disabledColor,
+            ),
+            textAlign: TextAlign.center,
+          ),
+        ],
+      ),
+    );
+  }
+}