diff --git a/cmd/config.go b/cmd/config.go
index 5da073c7c..f2edff8bf 100644
--- a/cmd/config.go
+++ b/cmd/config.go
@@ -28,6 +28,7 @@ type config struct {
 	Network      networkConfig
 	Log          string
 	SponsorToken string
+	Telemetry    bool
 	Metrics      bool
 	Profile      bool
 	Levels       map[string]string
diff --git a/cmd/setup.go b/cmd/setup.go
index 4e9000aed..83a90f584 100644
--- a/cmd/setup.go
+++ b/cmd/setup.go
@@ -21,6 +21,7 @@ import (
 	"github.com/evcc-io/evcc/util"
 	"github.com/evcc-io/evcc/util/pipe"
 	"github.com/evcc-io/evcc/util/sponsor"
+	"github.com/evcc-io/evcc/util/telemetry"
 	"github.com/samber/lo"
 	"github.com/spf13/viper"
 	"golang.org/x/text/currency"
@@ -51,6 +52,10 @@ func configureEnvironment(conf config) (err error) {
 		err = sponsor.ConfigureSponsorship(conf.SponsorToken)
 	}
 
+	if err == nil && conf.Telemetry {
+		err = telemetry.Create(sponsor.Token)
+	}
+
 	// setup mqtt client listener
 	if err == nil && conf.Mqtt.Broker != "" {
 		err = configureMQTT(conf.Mqtt)
diff --git a/core/savings.go b/core/savings.go
index dd7faade6..0db42c18f 100644
--- a/core/savings.go
+++ b/core/savings.go
@@ -125,27 +125,28 @@ func (s *Savings) updatePrices(p publisher) (float64, float64) {
 	return gridPrice, feedinPrice
 }
 
-func (s *Savings) Update(p publisher, gridPower, pvPower, batteryPower, chargePower float64) {
+// Update savings calculation and return grid/green energy added since last update
+func (s *Savings) Update(p publisher, gridPower, pvPower, batteryPower, chargePower float64) (float64, float64) {
 	gridPrice, feedinPrice := s.updatePrices(p)
 	defer func() { s.updated = s.clock.Now() }()
 
 	// no charging, no need to update
 	if chargePower == 0 {
-		return
+		return 0, 0
 	}
 
 	// assume charge power as constant over the duration -> rough kWh estimate
-	energyAdded := s.clock.Since(s.updated).Hours() * chargePower / 1e3
+	deltaCharged := s.clock.Since(s.updated).Hours() * chargePower / 1e3
 	share := s.shareOfSelfProducedEnergy(gridPower, pvPower, batteryPower)
 
-	addedSelfConsumption := energyAdded * share
-	addedGrid := energyAdded - addedSelfConsumption
+	deltaSelf := deltaCharged * share
+	deltaGrid := deltaCharged - deltaSelf
 
-	s.gridCharged += addedGrid
-	s.gridCost += addedGrid * gridPrice
-	s.gridSavedCost += addedSelfConsumption * (gridPrice - feedinPrice)
-	s.selfConsumptionCharged += addedSelfConsumption
-	s.selfConsumptionCost += addedSelfConsumption * feedinPrice
+	s.gridCharged += deltaGrid
+	s.gridCost += deltaGrid * gridPrice
+	s.gridSavedCost += deltaSelf * (gridPrice - feedinPrice)
+	s.selfConsumptionCharged += deltaSelf
+	s.selfConsumptionCost += deltaSelf * feedinPrice
 
 	p.publish("savingsTotalCharged", s.TotalCharged())
 	p.publish("savingsGridCharged", s.gridCharged)
@@ -153,4 +154,6 @@ func (s *Savings) Update(p publisher, gridPower, pvPower, batteryPower, chargePo
 	p.publish("savingsSelfConsumptionPercent", s.SelfConsumptionPercent())
 	p.publish("savingsEffectivePrice", s.EffectivePrice())
 	p.publish("savingsAmount", s.SavingsAmount())
+
+	return deltaCharged, deltaSelf
 }
diff --git a/core/site.go b/core/site.go
index a4f2bc69e..301f9ba32 100644
--- a/core/site.go
+++ b/core/site.go
@@ -14,6 +14,7 @@ import (
 	"github.com/evcc-io/evcc/push"
 	"github.com/evcc-io/evcc/tariff"
 	"github.com/evcc-io/evcc/util"
+	"github.com/evcc-io/evcc/util/telemetry"
 )
 
 // Updater abstracts the LoadPoint implementation for testing
@@ -325,7 +326,7 @@ func (site *Site) updateMeters() error {
 			if err == nil {
 				site.batteryPower += power
 			} else {
-				site.log.ERROR.Println(fmt.Errorf("battery meter %d: %v", id, err))
+				site.log.ERROR.Printf("battery meter %d: %v", id, err)
 			}
 		}
 
@@ -342,7 +343,7 @@ func (site *Site) updateMeters() error {
 			site.log.DEBUG.Printf("grid currents: %.3gA", []float64{i1, i2, i3})
 			site.publish("gridCurrents", []float64{i1, i2, i3})
 		} else {
-			site.log.ERROR.Println(fmt.Errorf("grid meter currents: %v", err))
+			site.log.ERROR.Printf("grid meter currents: %v", err)
 		}
 	}
 
@@ -371,7 +372,7 @@ func (site *Site) sitePower(totalChargePower float64) (float64, error) {
 		site.gridPower = totalChargePower - site.pvPower
 	}
 
-	// allow using Grid and charge as estimate for pv power
+	// allow using grid and charge as estimate for pv power
 	if site.pvMeters == nil {
 		site.pvPower = totalChargePower - site.gridPower + site.ResidualPower
 		if site.pvPower < 0 {
@@ -448,9 +449,12 @@ func (site *Site) update(lp Updater) {
 		site.Health.Update()
 	}
 
-	// update savings
+	// update savings and aggregate telemetry
 	// TODO: use energy instead of current power for better results
-	site.savings.Update(site, site.gridPower, site.pvPower, site.batteryPower, totalChargePower)
+	deltaCharged, deltaSelf := site.savings.Update(site, site.gridPower, site.pvPower, site.batteryPower, totalChargePower)
+	if totalChargePower > 0 {
+		go telemetry.ChargeProgress(site.log, totalChargePower, deltaCharged, deltaSelf)
+	}
 }
 
 // prepare publishes initial values
diff --git a/evcc.dist.yaml b/evcc.dist.yaml
index fd20eef04..8f47b21d2 100644
--- a/evcc.dist.yaml
+++ b/evcc.dist.yaml
@@ -15,6 +15,19 @@ interval: 10s # control cycle interval
 # sponsor token enables optional features (request at https://cloud.evcc.io)
 # sponsortoken:
 
+# telemetry enables aggregated statistics
+#
+# Telemetry allows collecting usage data (grid and green energy, charge power).
+# Data is aggregated, no individual charging sessions are tracked. The collected,
+# anonymous data can be retrieved using https://api.evcc.io.
+#
+# See https://github.com/evcc-io/evcc/pull/4343 or details.
+#
+# For time being, this is only available to sponsors, hence data is associated with
+# the sponsor token's identity.
+#
+# telemetry: true
+
 # log settings
 log: info
 levels:
diff --git a/util/telemetry/community.go b/util/telemetry/community.go
new file mode 100644
index 000000000..ce6032c1f
--- /dev/null
+++ b/util/telemetry/community.go
@@ -0,0 +1,61 @@
+package telemetry
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+
+	"github.com/evcc-io/evcc/util"
+	"github.com/evcc-io/evcc/util/request"
+	"github.com/evcc-io/evcc/util/sponsor"
+)
+
+var (
+	api     = "https://api.evcc.io"
+	enabled bool
+)
+
+func Create(token string) error {
+	if token == "" {
+		return errors.New("community requires sponsorship")
+	}
+
+	enabled = true
+	return nil
+}
+
+func ChargeProgress(log *util.Logger, power, deltaCharged, deltaGreen float64) {
+	log.DEBUG.Printf("community: Δ%.0f/%.0fkWh @ %.0fW", deltaGreen, deltaCharged, power)
+
+	if !enabled {
+		return
+	}
+
+	data := struct {
+		ChargePower  float64 `json:"chargePower"`
+		ChargeEnergy float64 `json:"chargeEnergy"`
+		GreenEnergy  float64 `json:"greenEnergy"`
+	}{
+		ChargePower:  power,
+		ChargeEnergy: deltaCharged,
+		GreenEnergy:  deltaGreen,
+	}
+
+	uri := fmt.Sprintf("%s/charged/%s", api, sponsor.Token)
+	req, err := request.New(http.MethodPost, uri, request.MarshalJSON(data))
+
+	var res struct {
+		Error string
+	}
+
+	if err == nil {
+		client := request.NewHelper(log)
+		if err = client.DoJSON(req, &res); err == nil && res.Error != "" {
+			err = errors.New(res.Error)
+		}
+	}
+
+	if err != nil {
+		log.ERROR.Printf("community api: %v", err)
+	}
+}