diff --git a/src/main/angular/src/app/date.service.ts b/src/main/angular/src/app/date.service.ts
new file mode 100644
index 0000000..49d0806
--- /dev/null
+++ b/src/main/angular/src/app/date.service.ts
@@ -0,0 +1,19 @@
+import {Injectable} from '@angular/core';
+import {timer} from 'rxjs';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class DateService {
+
+  private _now: Date = new Date();
+
+  get now(): Date {
+    return this._now;
+  }
+
+  constructor() {
+    timer(1000, 1000).subscribe(() => this._now = new Date());
+  }
+
+}
diff --git a/src/main/angular/src/app/location/Location.ts b/src/main/angular/src/app/location/Location.ts
index 5070ef9..a26a11d 100644
--- a/src/main/angular/src/app/location/Location.ts
+++ b/src/main/angular/src/app/location/Location.ts
@@ -1,5 +1,6 @@
 import {or, validateNumber, validateString} from '../common';
 import {Series} from '../series/Series';
+import {Value} from '../series/Value';
 
 export class Location {
 
@@ -8,14 +9,43 @@ export class Location {
     readonly name: string,
     readonly latitude: number,
     readonly longitude: number,
-    readonly energyPurchase: Series | null,
-    readonly energyDeliver: Series | null,
-    readonly energyProduce: Series | null,
-    readonly powerPurchase: Series | null,
-    readonly powerDeliver: Series | null,
-    readonly powerProduce: Series | null,
+    private _energyPurchase: Series | null,
+    private _energyDeliver: Series | null,
+    private _energyProduce: Series | null,
+    private _powerPurchase: Series | null,
+    private _powerDeliver: Series | null,
+    private _powerProduce: Series | null,
+    private _powerConsume: Value = Value.NULL,
   ) {
-    //
+    this.updateConsume();
+  }
+
+  readonly updateSeries = (series: Series) => {
+    if (series.equals(this._energyPurchase)) {
+      this._energyPurchase = series;
+    }
+    if (series.equals(this._energyDeliver)) {
+      this._energyDeliver = series;
+    }
+    if (series.equals(this._energyProduce)) {
+      this._energyProduce = series;
+    }
+    if (series.equals(this._powerProduce)) {
+      this._powerProduce = series;
+      this.updateConsume();
+    }
+    if (series.equals(this._powerPurchase)) {
+      this._powerPurchase = series;
+      this.updateConsume();
+    }
+    if (series.equals(this._powerDeliver)) {
+      this._powerDeliver = series;
+      this.updateConsume();
+    }
+  };
+
+  private updateConsume() {
+    this._powerConsume = Value.ZERO.plus(this._powerPurchase?.value, true).plus(this._powerProduce?.value, true).minus(this._powerDeliver?.value, true);
   }
 
   static fromJson(json: any): Location {
@@ -33,4 +63,32 @@ export class Location {
     );
   }
 
+  get energyPurchase(): Series | null {
+    return this._energyPurchase;
+  }
+
+  get energyDeliver(): Series | null {
+    return this._energyDeliver;
+  }
+
+  get energyProduce(): Series | null {
+    return this._energyProduce;
+  }
+
+  get powerPurchase(): Series | null {
+    return this._powerPurchase;
+  }
+
+  get powerDeliver(): Series | null {
+    return this._powerDeliver;
+  }
+
+  get powerProduce(): Series | null {
+    return this._powerProduce;
+  }
+
+  get powerConsume(): Value | null {
+    return this._powerConsume;
+  }
+
 }
diff --git a/src/main/angular/src/app/location/detail/location-detail.html b/src/main/angular/src/app/location/detail/location-detail.html
index 604d471..941b3d1 100644
--- a/src/main/angular/src/app/location/detail/location-detail.html
+++ b/src/main/angular/src/app/location/detail/location-detail.html
@@ -1,10 +1,10 @@
 @if (location) {
 
-  <app-series-history [now]="now" [location]="location" [interval]="null" heading="Aktuell"></app-series-history>
+  <app-location-power [location]="location"></app-location-power>
 
-  <app-series-history [now]="now" [location]="location" [interval]="Interval.DAY" heading="Heute"></app-series-history>
+  <app-series-history [location]="location" [interval]="Interval.DAY" heading="Heute"></app-series-history>
 
-  <app-series-history [now]="now" [location]="location" [interval]="Interval.DAY" [offset]="offset">
+  <app-series-history [location]="location" [interval]="Interval.DAY" [offset]="offset">
     <ng-content #SeriesHistoryHeading>
       <div style="display: flex; width: 100%">
         &nbsp;
@@ -31,17 +31,17 @@
           </div>
         </div>
         <div class="SectionBody">
-          <app-text [initial]="location.name" (onChange)="locationService.name(location, $event, updateLocation)"></app-text>
+          <app-text [initial]="location.name" (onChange)="locationService.name(location, $event)"></app-text>
         </div>
       </div>
       <div class="Section2">
         <div class="SectionHeading">
           <div class="SectionHeadingText">
-            Breitegrad
+            Breitengrad
           </div>
         </div>
         <div class="SectionBody">
-          <app-number [initial]="location.latitude" (onChange)="locationService.latitude(location, $event, updateLocation)" unit="°"></app-number>
+          <app-number [initial]="location.latitude" (onChange)="locationService.latitude(location, $event)" unit="°"></app-number>
         </div>
       </div>
       <div class="Section2">
@@ -51,7 +51,7 @@
           </div>
         </div>
         <div class="SectionBody">
-          <app-number [initial]="location.longitude" (onChange)="locationService.longitude(location, $event, updateLocation)" unit="°"></app-number>
+          <app-number [initial]="location.longitude" (onChange)="locationService.longitude(location, $event)" unit="°"></app-number>
         </div>
       </div>
     </div>
@@ -71,7 +71,7 @@
           </div>
         </div>
         <div class="SectionBody">
-          <app-series-select [now]="now" [initial]="location.energyPurchase" (onChange)="locationService.energyPurchase(location, $event, updateLocation)" [series]="filterEnergy()"></app-series-select>
+          <app-series-select [initial]="location.energyPurchase" (onChange)="locationService.energyPurchase(location, $event)" [filter]="filterEnergy"></app-series-select>
         </div>
       </div>
       <div class="Section2">
@@ -81,7 +81,7 @@
           </div>
         </div>
         <div class="SectionBody">
-          <app-series-select [now]="now" [initial]="location.energyDeliver" (onChange)="locationService.energyDeliver(location, $event, updateLocation)" [series]="filterEnergy()"></app-series-select>
+          <app-series-select [initial]="location.energyDeliver" (onChange)="locationService.energyDeliver(location, $event)" [filter]="filterEnergy"></app-series-select>
         </div>
       </div>
       <div class="Section2">
@@ -91,7 +91,7 @@
           </div>
         </div>
         <div class="SectionBody">
-          <app-series-select [now]="now" [initial]="location.energyProduce" (onChange)="locationService.energyProduce(location, $event, updateLocation)" [series]="filterEnergy()"></app-series-select>
+          <app-series-select [initial]="location.energyProduce" (onChange)="locationService.energyProduce(location, $event)" [filter]="filterEnergy"></app-series-select>
         </div>
       </div>
     </div>
@@ -111,7 +111,7 @@
           </div>
         </div>
         <div class="SectionBody">
-          <app-series-select [now]="now" [initial]="location.powerPurchase" (onChange)="locationService.powerPurchase(location, $event, updateLocation)" [series]="filterPower()"></app-series-select>
+          <app-series-select [initial]="location.powerPurchase" (onChange)="locationService.powerPurchase(location, $event)" [filter]="filterPower"></app-series-select>
         </div>
       </div>
       <div class="Section2">
@@ -121,7 +121,7 @@
           </div>
         </div>
         <div class="SectionBody">
-          <app-series-select [now]="now" [initial]="location.powerDeliver" (onChange)="locationService.powerDeliver(location, $event, updateLocation)" [series]="filterPower()"></app-series-select>
+          <app-series-select [initial]="location.powerDeliver" (onChange)="locationService.powerDeliver(location, $event)" [filter]="filterPower"></app-series-select>
         </div>
       </div>
       <div class="Section2">
@@ -131,7 +131,7 @@
           </div>
         </div>
         <div class="SectionBody">
-          <app-series-select [now]="now" [initial]="location.powerProduce" (onChange)="locationService.powerProduce(location, $event, updateLocation)" [series]="filterPower()"></app-series-select>
+          <app-series-select [initial]="location.powerProduce" (onChange)="locationService.powerProduce(location, $event)" [filter]="filterPower"></app-series-select>
         </div>
       </div>
     </div>
diff --git a/src/main/angular/src/app/location/detail/location-detail.ts b/src/main/angular/src/app/location/detail/location-detail.ts
index e6913f6..e58f14f 100644
--- a/src/main/angular/src/app/location/detail/location-detail.ts
+++ b/src/main/angular/src/app/location/detail/location-detail.ts
@@ -5,21 +5,15 @@ import {Location} from '../Location';
 import {Text} from '../../shared/text/text';
 import {Number} from '../../shared/number/number';
 import {SeriesSelect} from '../../series/select/series-select';
-import {Series} from '../../series/Series';
-import {SeriesService} from '../../series/series-service';
-import {SeriesType} from '../../series/SeriesType';
-import {Subscription, timer} from 'rxjs';
-import {LocationElectricity} from '../electricity/location-electricity';
+import {Subscription} from 'rxjs';
+import {LocationEnergy} from '../electricity/location-energy';
 import {Interval} from '../../series/Interval';
 import {MenuService} from '../../menu-service';
 import {DatePipe} from '@angular/common';
-import {WebsocketService} from '../../common';
-
-function yesterday(now: any) {
-  const yesterday = new Date(now.getTime());
-  yesterday.setDate(yesterday.getDate() - 1);
-  return yesterday;
-}
+import {Series} from '../../series/Series';
+import {SeriesType} from '../../series/SeriesType';
+import {DateService} from '../../date.service';
+import {LocationPower} from '../power/location-power';
 
 @Component({
   selector: 'app-location-detail',
@@ -27,13 +21,18 @@ function yesterday(now: any) {
     Text,
     Number,
     SeriesSelect,
-    LocationElectricity
+    LocationEnergy,
+    LocationPower
   ],
   templateUrl: './location-detail.html',
   styleUrl: './location-detail.less',
 })
 export class LocationDetail implements OnInit, OnDestroy {
 
+  protected readonly filterEnergy = (series: Series) => series.type === SeriesType.DELTA && series.unit === 'kWh';
+
+  protected readonly filterPower = (series: Series) => series.type === SeriesType.VARYING && series.unit === 'W';
+
   protected readonly Interval = Interval;
 
   protected readonly Math = Math;
@@ -42,85 +41,46 @@ export class LocationDetail implements OnInit, OnDestroy {
 
   private readonly subs: Subscription [] = [];
 
-  private series: Series[] = [];
-
-  protected now: Date = new Date();
-
-  protected yesterday: Date = yesterday(this.now);
-
   protected offset: number = 1;
 
   private readonly datePipe: DatePipe;
 
   constructor(
     readonly locationService: LocationService,
-    readonly seriesService: SeriesService,
     readonly activatedRoute: ActivatedRoute,
     readonly menuService: MenuService,
-    readonly websocketService: WebsocketService,
+    readonly dateService: DateService,
     @Inject(LOCALE_ID) readonly locale: string,
   ) {
     this.datePipe = new DatePipe(locale);
   }
 
   ngOnInit(): void {
-    this.subs.push(this.websocketService.onChange((connected) => {
-      if (connected) {
-        this.seriesService.findAll(list => this.series = list);
-      } else {
-        this.location = null;
-      }
-    }));
-    this.subs.push(this.activatedRoute.params.subscribe(params => {
-      this.locationService.getById(params['id'], location => {
-        this.location = location;
-        this.menuService.title = this.location.name;
-      });
-    }));
-    this.subs.push(this.seriesService.subscribe(this.updateSeries));
-    this.subs.push(timer(1000, 1000).subscribe(() => {
-      this.now = new Date();
-      this.yesterday = yesterday(this.now);
-    }));
+    this.locationService.id = null;
+    this.subs.push(this.activatedRoute.params.subscribe(params => this.locationService.id = params['id'] || null));
+    this.subs.push(this.locationService.location$.subscribe(this.onLocationChange));
   }
 
+  private readonly onLocationChange = (location: Location | null): void => {
+    this.location = location;
+    if (this.location) {
+      this.menuService.title = this.location.name;
+    }
+  };
+
   ngOnDestroy(): void {
     this.location = null;
     this.menuService.title = "";
     this.subs.forEach(sub => sub.unsubscribe());
+    this.subs.length = 0;
   }
 
-  protected readonly updateLocation = (location: Location): void => {
-    if (this.location?.id === location.id) {
-      this.location = location;
-    }
-  };
-
-  protected readonly updateSeries = (fresh: Series): void => {
-    const index = this.series.findIndex(series => series.id === fresh.id);
-    if (index >= 0) {
-      this.series.splice(index, 1, fresh);
-    } else {
-      this.series.push(fresh);
-    }
-  };
-
-  protected readonly filterEnergy = (): Series[] => {
-    return this.series.filter(series => series.type === SeriesType.DELTA && series.unit === 'kWh');
-  };
-
-  protected readonly filterPower = (): Series[] => {
-    return this.series.filter(series => series.type === SeriesType.VARYING && series.unit === 'W');
-  };
-
   protected offsetDayTitle(): string {
     if (this.offset === 1) {
       return 'Gestern';
-    } else if (this.offset === 2) {
-      return 'Vorgestern';
     } else {
       if (this.offset < 7) {
-        const d = new Date(this.now);
+        const d = new Date(this.dateService.now);
         d.setDate(d.getDate() - this.offset);
         return this.datePipe.transform(d, 'EEEE') || '';
       }
diff --git a/src/main/angular/src/app/location/electricity/location-electricity.ts b/src/main/angular/src/app/location/electricity/location-electricity.ts
deleted file mode 100644
index 907af62..0000000
--- a/src/main/angular/src/app/location/electricity/location-electricity.ts
+++ /dev/null
@@ -1,119 +0,0 @@
-import {AfterViewInit, Component, Input, OnDestroy, OnInit} from '@angular/core';
-import {Location} from '../Location';
-import {Series} from '../../series/Series';
-import {Next} from '../../common';
-import {Interval} from '../../series/Interval';
-import {PointService} from '../../point/point-service';
-import {SeriesService} from '../../series/series-service';
-import {Subscription} from 'rxjs';
-import {Value} from '../../series/Value';
-
-@Component({
-  selector: 'app-series-history',
-  imports: [],
-  templateUrl: './location-electricity.html',
-  styleUrl: './location-electricity.less',
-})
-export class LocationElectricity implements OnInit, AfterViewInit, OnDestroy {
-
-  protected readonly Interval = Interval;
-
-  private readonly subs: Subscription[] = [];
-
-  protected purchase: Value = Value.NONE;
-
-  protected deliver: Value = Value.NONE;
-
-  protected produce: Value = Value.NONE;
-
-  protected consume: Value = Value.NONE;
-
-  @Input()
-  heading: string = "";
-
-  private _o_: number = 0;
-
-  @Input()
-  set offset(value: number) {
-    this._o_ = value;
-    this.ngAfterViewInit();
-  }
-
-  get offset(): number {
-    return this._o_;
-  }
-
-  @Input()
-  interval: Interval | null = null;
-
-  @Input()
-  location!: Location;
-
-  @Input()
-  now: Date = new Date();
-
-  constructor(
-    readonly pointService: PointService,
-    readonly serieService: SeriesService,
-  ) {
-    //
-  }
-
-  ngOnInit(): void {
-    this.subs.push(this.serieService.subscribe(this.update));
-  }
-
-  ngAfterViewInit(): void {
-    if (this.interval) {
-      this.history(null, this.location?.energyPurchase, history => this.purchase = history);
-      this.history(null, this.location?.energyDeliver, history => this.deliver = history);
-      this.history(null, this.location?.energyProduce, history => this.produce = history);
-    } else {
-      this.history(null, this.location?.powerPurchase, history => this.purchase = history);
-      this.history(null, this.location?.powerDeliver, history => this.deliver = history);
-      this.history(null, this.location?.powerProduce, history => this.produce = history);
-    }
-  }
-
-  ngOnDestroy(): void {
-    this.subs.forEach(sub => sub.unsubscribe());
-  }
-
-  protected readonly update = (fresh: Series): void => {
-    if (this.interval) {
-      if (this.offset > 0) {
-        return;
-      }
-      this.history(fresh, this.location?.energyPurchase, value => this.purchase = value);
-      this.history(fresh, this.location?.energyDeliver, value => this.deliver = value);
-      this.history(fresh, this.location?.energyProduce, value => this.produce = value);
-    } else {
-      this.history(fresh, this.location?.powerPurchase, value => this.purchase = value);
-      this.history(fresh, this.location?.powerDeliver, value => this.deliver = value);
-      this.history(fresh, this.location?.powerProduce, value => this.produce = value);
-    }
-  };
-
-  private history(fresh: Series | null | undefined, series: Series | null | undefined, next: Next<Value>): void {
-    const callNextAndUpdateConsume = (value: Value) => {
-      next(value);
-      this.consume = this.purchase.plus(this.produce).minus(this.deliver);
-    };
-    if (fresh !== null && fresh !== undefined) {
-      if (fresh.id !== series?.id) {
-        return;
-      }
-      series = fresh;
-    }
-    if (!series) {
-      callNextAndUpdateConsume(Value.NONE);
-      return
-    }
-    if (this.interval) {
-      this.pointService.relative([series], this.interval, this.offset, 1, response => callNextAndUpdateConsume(Value.ofPoint(response, 0, 0, 1)));
-    } else {
-      callNextAndUpdateConsume(series.value);
-    }
-  }
-
-}
diff --git a/src/main/angular/src/app/location/electricity/location-electricity.html b/src/main/angular/src/app/location/electricity/location-energy.html
similarity index 78%
rename from src/main/angular/src/app/location/electricity/location-electricity.html
rename to src/main/angular/src/app/location/electricity/location-energy.html
index 3159e9a..49e929e 100644
--- a/src/main/angular/src/app/location/electricity/location-electricity.html
+++ b/src/main/angular/src/app/location/electricity/location-energy.html
@@ -12,7 +12,7 @@
         Bezug
       </div>
       <div class="SectionBody purchase">
-        {{ purchase.toValueString(true, interval ? null : now) }}
+        {{ purchase.toValueString(interval ? null : now) }}
       </div>
     </div>
 
@@ -21,7 +21,7 @@
         Solar
       </div>
       <div class="SectionBody produce">
-        {{ produce.toValueString(true, interval ? null : now) }}
+        {{ produce.toValueString(interval ? null : now) }}
       </div>
     </div>
 
@@ -30,7 +30,7 @@
         Verbrauch
       </div>
       <div class="SectionBody consume">
-        {{ consume.toValueString(true, interval ? null : now) }}
+        {{ consume.toValueString(interval ? null : now) }}
       </div>
     </div>
 
@@ -39,7 +39,7 @@
         Einspeisung
       </div>
       <div class="SectionBody deliver">
-        {{ deliver.toValueString(true, interval ? null : now) }}
+        {{ deliver.toValueString(interval ? null : now) }}
       </div>
     </div>
 
diff --git a/src/main/angular/src/app/location/electricity/location-electricity.less b/src/main/angular/src/app/location/electricity/location-energy.less
similarity index 100%
rename from src/main/angular/src/app/location/electricity/location-electricity.less
rename to src/main/angular/src/app/location/electricity/location-energy.less
diff --git a/src/main/angular/src/app/location/electricity/location-energy.ts b/src/main/angular/src/app/location/electricity/location-energy.ts
new file mode 100644
index 0000000..65d6e94
--- /dev/null
+++ b/src/main/angular/src/app/location/electricity/location-energy.ts
@@ -0,0 +1,107 @@
+import {AfterViewInit, Component, Input, OnDestroy, OnInit} from '@angular/core';
+import {Location} from '../Location';
+import {Series} from '../../series/Series';
+import {Next} from '../../common';
+import {Interval} from '../../series/Interval';
+import {PointService} from '../../point/point-service';
+import {SeriesService} from '../../series/series-service';
+import {Subscription} from 'rxjs';
+import {Value} from '../../series/Value';
+
+@Component({
+  selector: 'app-series-history',
+  imports: [],
+  templateUrl: './location-energy.html',
+  styleUrl: './location-energy.less',
+})
+export class LocationEnergy implements OnInit, AfterViewInit, OnDestroy {
+
+  protected readonly Interval = Interval;
+
+  private readonly subs: Subscription[] = [];
+
+  protected purchase: Value = Value.NULL;
+
+  protected deliver: Value = Value.NULL;
+
+  protected produce: Value = Value.NULL;
+
+  protected consume: Value = Value.NULL;
+
+  @Input()
+  heading!: string;
+
+  private _o_: number = 0;
+
+  @Input()
+  set offset(value: number) {
+    this._o_ = value;
+    this.ngAfterViewInit();
+  }
+
+  get offset(): number {
+    return this._o_;
+  }
+
+  @Input()
+  interval!: Interval;
+
+  @Input()
+  location!: Location;
+
+  @Input()
+  now: Date = new Date();
+
+  constructor(
+    readonly pointService: PointService,
+    readonly serieService: SeriesService,
+  ) {
+    //
+  }
+
+  ngOnInit(): void {
+    this.subs.push(this.serieService.subscribe(this.update));
+  }
+
+  ngAfterViewInit(): void {
+    this.fetch(null, this.location?.energyPurchase, history => this.purchase = history);
+    this.fetch(null, this.location?.energyDeliver, history => this.deliver = history);
+    this.fetch(null, this.location?.energyProduce, history => this.produce = history);
+  }
+
+  ngOnDestroy(): void {
+    this.subs.forEach(sub => sub.unsubscribe());
+  }
+
+  protected readonly update = (fresh: Series): void => {
+    if (this.offset > 0) {
+      return;
+    }
+    this.fetch(fresh, this.location?.energyPurchase, value => this.purchase = value);
+    this.fetch(fresh, this.location?.energyDeliver, value => this.deliver = value);
+    this.fetch(fresh, this.location?.energyProduce, value => this.produce = value);
+  };
+
+  private fetch(fresh: Series | null | undefined, series: Series | null | undefined, next: Next<Value>): void {
+    const callNextAndUpdateConsume = (value: Value) => {
+      next(value);
+      this.consume = this.purchase.plus(this.produce, true).minus(this.deliver, true);
+    };
+    if (fresh !== null && fresh !== undefined) {
+      if (fresh.id !== series?.id) {
+        return;
+      }
+      series = fresh;
+    }
+    if (!series) {
+      callNextAndUpdateConsume(Value.NULL);
+      return
+    }
+    if (this.interval) {
+      this.pointService.relative([series], this.interval, this.offset, 1, response => callNextAndUpdateConsume(Value.ofPoint(response, 0, 0, 1)));
+    } else {
+      callNextAndUpdateConsume(series.value);
+    }
+  }
+
+}
diff --git a/src/main/angular/src/app/location/electricity/graph/simple-plot.html b/src/main/angular/src/app/location/graph/simple-plot.html
similarity index 100%
rename from src/main/angular/src/app/location/electricity/graph/simple-plot.html
rename to src/main/angular/src/app/location/graph/simple-plot.html
diff --git a/src/main/angular/src/app/location/electricity/graph/simple-plot.less b/src/main/angular/src/app/location/graph/simple-plot.less
similarity index 100%
rename from src/main/angular/src/app/location/electricity/graph/simple-plot.less
rename to src/main/angular/src/app/location/graph/simple-plot.less
diff --git a/src/main/angular/src/app/location/electricity/graph/simple-plot.ts b/src/main/angular/src/app/location/graph/simple-plot.ts
similarity index 92%
rename from src/main/angular/src/app/location/electricity/graph/simple-plot.ts
rename to src/main/angular/src/app/location/graph/simple-plot.ts
index e31a8f2..a32c7a2 100644
--- a/src/main/angular/src/app/location/electricity/graph/simple-plot.ts
+++ b/src/main/angular/src/app/location/graph/simple-plot.ts
@@ -1,7 +1,7 @@
 import {AfterViewInit, Component, Input} from '@angular/core';
-import {Location} from '../../Location';
-import {Interval} from '../../../series/Interval';
-import {PointService} from '../../../point/point-service';
+import {Location} from '../Location';
+import {Interval} from '../../series/Interval';
+import {PointService} from '../../point/point-service';
 
 @Component({
   selector: 'app-series-history-graph',
diff --git a/src/main/angular/src/app/location/location-service.ts b/src/main/angular/src/app/location/location-service.ts
index 9269e55..ce0944a 100644
--- a/src/main/angular/src/app/location/location-service.ts
+++ b/src/main/angular/src/app/location/location-service.ts
@@ -1,14 +1,44 @@
 import {Injectable} from '@angular/core';
 import {ApiService, CrudService, Next, WebsocketService} from '../common';
 import {Location} from './Location'
+import {SeriesService} from '../series/series-service';
+import {BehaviorSubject, Observable} from 'rxjs';
 
 @Injectable({
   providedIn: 'root'
 })
 export class LocationService extends CrudService<Location> {
 
-  constructor(api: ApiService, ws: WebsocketService) {
+  private readonly _location = new BehaviorSubject<Location | null>(null);
+
+  private _id: number | null = null;
+
+  constructor(
+    api: ApiService,
+    ws: WebsocketService,
+    readonly seriesService: SeriesService,
+  ) {
     super(api, ws, ['Location'], Location.fromJson);
+    this.seriesService.subscribe(series => this._location.value?.updateSeries(series));
+    this.ws.onConnect(this.fetch);
+    this.ws.onDisconnect(() => this._location.next(null));
+  }
+
+  set id(id: number | null) {
+    this._id = id;
+    this.fetch();
+  }
+
+  private readonly fetch = () => {
+    if (this._id === null) {
+      this._location.next(null);
+    } else {
+      this.getById(this._id, location => this._location.next(location));
+    }
+  };
+
+  get location$(): Observable<Location | null> {
+    return this._location.asObservable();
   }
 
   findAll(next: Next<Location[]>) {
diff --git a/src/main/angular/src/app/location/power/location-power.html b/src/main/angular/src/app/location/power/location-power.html
new file mode 100644
index 0000000..1683e7a
--- /dev/null
+++ b/src/main/angular/src/app/location/power/location-power.html
@@ -0,0 +1,47 @@
+<div class="Section3">
+  <div class="SectionHeading">
+    <div class="SectionHeadingText">
+      Aktuelle Leistung
+    </div>
+  </div>
+  <div class="SectionBody">
+
+    <div class="Section4">
+      <div class="SectionHeadingText">
+        Bezug
+      </div>
+      <div class="SectionBody purchase">
+        {{ location.powerPurchase?.value?.toValueString(dateService.now) }}
+      </div>
+    </div>
+
+    <div class="Section4">
+      <div class="SectionHeadingText">
+        Solar
+      </div>
+      <div class="SectionBody produce">
+        {{ location.powerProduce?.value?.toValueString(dateService.now) }}
+      </div>
+    </div>
+
+    <div class="Section4">
+      <div class="SectionHeadingText">
+        Verbrauch
+      </div>
+      <div class="SectionBody consume">
+        {{ location.powerConsume?.toValueString(dateService.now) }}
+      </div>
+    </div>
+
+    <div class="Section4">
+      <div class="SectionHeadingText">
+        Einspeisung
+      </div>
+      <div class="SectionBody deliver">
+        {{ location.powerDeliver?.value?.toValueString(dateService.now) }}
+      </div>
+    </div>
+
+  </div>
+
+</div>
diff --git a/src/main/angular/src/app/location/power/location-power.less b/src/main/angular/src/app/location/power/location-power.less
new file mode 100644
index 0000000..876e2a5
--- /dev/null
+++ b/src/main/angular/src/app/location/power/location-power.less
@@ -0,0 +1 @@
+@import "../../../colors";
diff --git a/src/main/angular/src/app/location/power/location-power.ts b/src/main/angular/src/app/location/power/location-power.ts
new file mode 100644
index 0000000..d067e77
--- /dev/null
+++ b/src/main/angular/src/app/location/power/location-power.ts
@@ -0,0 +1,22 @@
+import {Component, Input} from '@angular/core';
+import {Location} from '../Location';
+import {DateService} from '../../date.service';
+
+@Component({
+  selector: 'app-location-power',
+  imports: [],
+  templateUrl: './location-power.html',
+  styleUrl: './location-power.less',
+})
+export class LocationPower {
+
+  @Input()
+  location!: Location;
+
+  constructor(
+    readonly dateService: DateService,
+  ) {
+    //
+  }
+
+}
diff --git a/src/main/angular/src/app/series/Series.ts b/src/main/angular/src/app/series/Series.ts
index 8d455a8..a77a00a 100644
--- a/src/main/angular/src/app/series/Series.ts
+++ b/src/main/angular/src/app/series/Series.ts
@@ -33,4 +33,8 @@ export class Series {
     );
   }
 
+  equals(other: Series | null | undefined): boolean {
+    return this.id === other?.id;
+  }
+
 }
diff --git a/src/main/angular/src/app/series/Value.ts b/src/main/angular/src/app/series/Value.ts
index 1baee61..208d97e 100644
--- a/src/main/angular/src/app/series/Value.ts
+++ b/src/main/angular/src/app/series/Value.ts
@@ -4,10 +4,12 @@ import {Series} from './Series';
 
 export class Value {
 
-  static readonly NONE: Value = new Value(null, 0, 0, "", new Date());
+  static readonly NULL: Value = new Value(NaN, 0, 0, "", new Date());
 
-  private constructor(
-    readonly value: number | null,
+  static readonly ZERO: Value = new Value(0, 0, Infinity, "", new Date());
+
+  protected constructor(
+    readonly value: number,
     readonly precision: number,
     readonly seconds: number,
     readonly unit: string,
@@ -16,57 +18,43 @@ export class Value {
     //
   }
 
-  toValueString(zeroToDash: boolean, now_ageCheckToDash: Date | null): string {
-    if (this.value === null) {
+  toValueString(now: Date | null): string {
+    if (isNaN(this.value)) {
       return "-";
     }
     if (this.value === 0) {
-      return zeroToDash ? "-" : `0 ${this.unit}`;
+      return `0 ${this.unit}`;
     }
-    if (now_ageCheckToDash !== null) {
-      const ageSeconds = (now_ageCheckToDash.getTime() - this.date.getTime()) / 1000;
-      if (ageSeconds > this.seconds * 2.1) {
-        return `--- ${this.unit}`
-      }
+    if (now !== null && this.isOld(now)) {
+      return `--- ${this.unit}`
     }
-
     const scale = Math.floor(Math.log10(this.value));
     const rest = scale - this.precision + 1;
-    if (isNaN(rest)) {
-      console.log(this);
-    }
     if (rest >= 0) {
       return `${Math.round(this.value)} ${this.unit}`;
     }
     return formatNumber(this.value, "de-DE", `0.${-rest}-${-rest}`) + ' ' + this.unit;
   }
 
-  plus(other: Value): Value {
-    return this.operateSameUnit("plus", other, (a, b) => a + b);
+  plus(other: Value | null | undefined, nullToZero: boolean): Value {
+    if (!nullToZero && (other === null || other === undefined)) {
+      return Value.NULL;
+    }
+    return new BiValue(this, other || Value.ZERO, (a, b) => a + b);
   }
 
-  minus(other: Value): Value {
-    return this.operateSameUnit("minus", other, (a, b) => a - b);
-  }
-
-  operateSameUnit(name: string, other: Value, operation: (a: number, b: number) => number): Value {
-    if (this.value === null || other.value === null) {
-      return Value.NONE;
+  minus(other: Value | null | undefined, nullToZero: boolean): Value {
+    if (!nullToZero && (other === null || other === undefined)) {
+      return Value.NULL;
     }
-    if (this.unit !== other.unit) {
-      throw new Error(`Operation '${name} needs units to be the same: this=${this}, other=${other}`);
-    }
-    const decimals = Math.max(this.precision, other.precision);
-    const seconds = Math.max(this.seconds, other.seconds);
-    const date = this.date.getTime() < other.date.getTime() ? this.date : other.date;
-    return new Value(operation(this.value, other.value), decimals, seconds, this.unit, date);
+    return new BiValue(this, other || Value.ZERO, (a, b) => a - b);
   }
 
   static of(series: Series, value: number | null | undefined, date: Date | null | undefined): Value {
     value = value === undefined ? null : value;
     date = date === undefined ? null : date;
     if (value === null) {
-      return this.NONE;
+      return this.NULL;
     }
     if (date === null) {
       throw new Error("When 'value' is set, 'last' must be set too, but isn't!")
@@ -77,12 +65,12 @@ export class Value {
   static ofPoint(response: PointResponse, seriesIndex: number, pointIndex: number, valueIndex: number): Value {
     const series = response.series[seriesIndex];
     if (!series) {
-      return this.NONE;
+      return this.NULL;
     }
 
     const point = series.points[pointIndex];
     if (!point) {
-      return this.NONE;
+      return this.NULL;
     }
 
     const date = new Date(point[0] * 1000);
@@ -90,4 +78,31 @@ export class Value {
     return Value.of(series.series, value, date);
   }
 
+  isOld(now: Date) {
+    const ageSeconds = (now.getTime() - this.date.getTime()) / 1000;
+    return ageSeconds > this.seconds * 2.1;
+  }
+
+}
+
+export class BiValue extends Value {
+
+  constructor(
+    readonly a: Value,
+    readonly b: Value,
+    readonly operation: (a: number, b: number) => number,
+  ) {
+    if (a.unit !== "" && b.unit !== "" && a.unit !== b.unit) {
+      throw new Error(`Operation needs units to be equal or empty: this=${a}, other=${b}`);
+    }
+    const precision = Math.max(a.precision, b.precision);
+    const unit = a.unit || b.unit;
+    const date = a.date.getTime() < b.date.getTime() ? a.date : b.date;
+    super(operation(a.value, b.value), precision, 0, unit, date);
+  }
+
+  override isOld(now: Date): boolean {
+    return this.a.isOld(now) || this.b.isOld(now);
+  }
+
 }
diff --git a/src/main/angular/src/app/series/select/series-select.html b/src/main/angular/src/app/series/select/series-select.html
index c7844e1..2bfed28 100644
--- a/src/main/angular/src/app/series/select/series-select.html
+++ b/src/main/angular/src/app/series/select/series-select.html
@@ -8,7 +8,7 @@
     <option [ngValue]="null">-</option>
     @for (series of series; track series.id) {
       <option [ngValue]="series.id">
-        {{ series.name }}: {{ series.value.toValueString(false, now) }}
+        {{ series.name }}: {{ series.value.toValueString(dateService.now) }}
       </option>
     }
   </select>
diff --git a/src/main/angular/src/app/series/select/series-select.ts b/src/main/angular/src/app/series/select/series-select.ts
index b6cfb2c..be95bb9 100644
--- a/src/main/angular/src/app/series/select/series-select.ts
+++ b/src/main/angular/src/app/series/select/series-select.ts
@@ -1,10 +1,13 @@
-import {Component, EventEmitter, Input, Output} from '@angular/core';
+import {Component, EventEmitter, Input, OnDestroy, OnInit, Output} from '@angular/core';
 import {FaIconComponent} from '@fortawesome/angular-fontawesome';
 import {FormsModule} from '@angular/forms';
 import {NgClass} from '@angular/common';
 import {faPen} from '@fortawesome/free-solid-svg-icons';
 import {Series} from '../Series';
 import {or} from '../../common';
+import {SeriesService} from '../series-service';
+import {map, Subscription} from 'rxjs';
+import {DateService} from '../../date.service';
 
 @Component({
   selector: 'app-series-select',
@@ -16,21 +19,21 @@ import {or} from '../../common';
   templateUrl: './series-select.html',
   styleUrl: './series-select.less',
 })
-export class SeriesSelect {
+export class SeriesSelect implements OnInit, OnDestroy {
 
   protected readonly faPen = faPen;
 
   private _initial: Series | null = null;
 
-  @Input()
-  now!: Date;
-
   @Input()
   series!: Series[];
 
   @Input()
   allowEmpty: boolean = true;
 
+  @Input()
+  filter: (series: Series) => boolean = () => true;
+
   @Output()
   readonly onChange = new EventEmitter<number | null>();
 
@@ -40,24 +43,43 @@ export class SeriesSelect {
 
   protected readonly Series = Series;
 
+  private readonly subs: Subscription[] = [];
+
+  constructor(
+    readonly seriesService: SeriesService,
+    readonly dateService: DateService,
+  ) {
+    //
+  }
+
+  ngOnInit(): void {
+    this.subs.push(
+      this.seriesService
+        .all$
+        .pipe(map(series => series.filter(this.filter)))
+        .subscribe(list => this.series = list)
+    );
+  }
+
+  ngOnDestroy(): void {
+    this.subs.forEach(sub => sub.unsubscribe());
+    this.subs.length = 0;
+  }
+
   @Input()
   set initial(value: Series | null) {
     this._initial = value;
     this.reset();
   }
 
-  private reset() {
-    this.model = or(this.initial, i => i.id, null);
-  }
-
-  get initial(): Series | null {
-    return this._initial;
-  }
+  private readonly reset = (): void => {
+    this.model = or(this._initial, i => i.id, null);
+  };
 
   protected classes(): {} {
     return {
-      "unchanged": this.model === this.initial,
-      "changed": this.model !== or(this.initial, i => i.id, null),
+      "unchanged": this.model === this._initial,
+      "changed": this.model !== or(this._initial, i => i.id, null),
       "invalid": !this.allowEmpty && this.model === null,
     };
   }
diff --git a/src/main/angular/src/app/series/series-service.ts b/src/main/angular/src/app/series/series-service.ts
index 33a8f66..1ba2aa7 100644
--- a/src/main/angular/src/app/series/series-service.ts
+++ b/src/main/angular/src/app/series/series-service.ts
@@ -1,14 +1,14 @@
 import {Inject, Injectable, LOCALE_ID} from '@angular/core';
-import {ApiService, CrudService, Next, WebsocketService} from '../common';
+import {ApiService, CrudService, WebsocketService} from '../common';
 import {Series} from './Series';
-import {DatePipe} from '@angular/common';
+import {BehaviorSubject, Observable} from 'rxjs';
 
 @Injectable({
   providedIn: 'root'
 })
 export class SeriesService extends CrudService<Series> {
 
-  private readonly datePipe: DatePipe;
+  private readonly allSubject: BehaviorSubject<Series[]> = new BehaviorSubject<Series[]>([]);
 
   constructor(
     api: ApiService,
@@ -16,11 +16,21 @@ export class SeriesService extends CrudService<Series> {
     @Inject(LOCALE_ID) readonly locale: string,
   ) {
     super(api, ws, ['Series'], Series.fromJson);
-    this.datePipe = new DatePipe(locale);
+    this.subscribe(fresh => {
+      const index = this.allSubject.value.findIndex(series => series.id === fresh.id);
+      if (index >= 0) {
+        const list = [...this.allSubject.value];
+        list.splice(index, 1, fresh);
+        this.allSubject.next(list);
+      } else {
+        this.allSubject.next([...this.allSubject.value, fresh]);
+      }
+    });
+    this.getList(['findAll'], list => this.allSubject.next(list));
   }
 
-  findAll(next: Next<Series[]>) {
-    this.getList(['findAll'], next);
+  get all$(): Observable<Series[]> {
+    return this.allSubject.asObservable();
   }
 
 }