diff --git a/cmd/root.go b/cmd/root.go
index 8f48f99ad..f1f0ecc59 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -200,7 +200,7 @@ func run(cmd *cobra.Command, args []string) {
 
 	// start HEMS server
 	if conf.HEMS.Type != "" {
-		hems := configureHEMS(conf.HEMS, site, cache, httpd)
+		hems := configureHEMS(conf.HEMS, site, httpd)
 		go hems.Run()
 	}
 
diff --git a/cmd/setup.go b/cmd/setup.go
index 52a600d9c..9bece6170 100644
--- a/cmd/setup.go
+++ b/cmd/setup.go
@@ -143,8 +143,8 @@ func configureJavascript(conf map[string]interface{}) error {
 }
 
 // setup HEMS
-func configureHEMS(conf typedConfig, site *core.Site, cache *util.Cache, httpd *server.HTTPd) hems.HEMS {
-	hems, err := hems.NewFromConfig(conf.Type, conf.Other, site, cache, httpd)
+func configureHEMS(conf typedConfig, site *core.Site, httpd *server.HTTPd) hems.HEMS {
+	hems, err := hems.NewFromConfig(conf.Type, conf.Other, site, httpd)
 	if err != nil {
 		log.FATAL.Fatalf("failed configuring hems: %v", err)
 	}
diff --git a/hems/config.go b/hems/config.go
index db553eb81..b9320ffdd 100644
--- a/hems/config.go
+++ b/hems/config.go
@@ -8,7 +8,6 @@ import (
 	"github.com/evcc-io/evcc/hems/ocpp"
 	"github.com/evcc-io/evcc/hems/semp"
 	"github.com/evcc-io/evcc/server"
-	"github.com/evcc-io/evcc/util"
 )
 
 // HEMS describes the HEMS system interface
@@ -17,12 +16,12 @@ type HEMS interface {
 }
 
 // NewFromConfig creates new HEMS from config
-func NewFromConfig(typ string, other map[string]interface{}, site *core.Site, cache *util.Cache, httpd *server.HTTPd) (HEMS, error) {
+func NewFromConfig(typ string, other map[string]interface{}, site *core.Site, httpd *server.HTTPd) (HEMS, error) {
 	switch strings.ToLower(typ) {
 	case "sma", "shm", "semp":
-		return semp.New(other, site, cache, httpd)
+		return semp.New(other, site, httpd)
 	case "ocpp":
-		return ocpp.New(other, site, cache)
+		return ocpp.New(other, site)
 	default:
 		return nil, errors.New("unknown hems: " + typ)
 	}
diff --git a/hems/ocpp/ocpp.go b/hems/ocpp/ocpp.go
index c8745ab69..0429d6d65 100644
--- a/hems/ocpp/ocpp.go
+++ b/hems/ocpp/ocpp.go
@@ -19,16 +19,15 @@ import (
 
 // OCPP is an OCPP client
 type OCPP struct {
-	log   *util.Logger
-	cache *util.Cache
-	site  site.API
-	cp    ocpp16.ChargePoint
+	log  *util.Logger
+	site site.API
+	cp   ocpp16.ChargePoint
 }
 
 const retryTimeout = 5 * time.Second
 
 // New generates OCPP chargepoint client
-func New(conf map[string]interface{}, site site.API, cache *util.Cache) (*OCPP, error) {
+func New(conf map[string]interface{}, site site.API) (*OCPP, error) {
 	cc := struct {
 		URI       string
 		StationID string
@@ -54,10 +53,9 @@ func New(conf map[string]interface{}, site site.API, cache *util.Cache) (*OCPP,
 	cp := ocpp16.NewChargePoint(cc.StationID, nil, ws)
 
 	s := &OCPP{
-		log:   log,
-		cache: cache,
-		site:  site,
-		cp:    cp,
+		log:  log,
+		site: site,
+		cp:   cp,
 	}
 
 	err := cp.Start(cc.URI)
diff --git a/hems/semp/semp.go b/hems/semp/semp.go
index 22c436a6b..3a091d890 100644
--- a/hems/semp/semp.go
+++ b/hems/semp/semp.go
@@ -41,7 +41,6 @@ var (
 // SEMP is the SMA SEMP server
 type SEMP struct {
 	log          *util.Logger
-	cache        *util.Cache
 	closeC       chan struct{}
 	doneC        chan struct{}
 	controllable bool
@@ -54,7 +53,7 @@ type SEMP struct {
 }
 
 // New generates SEMP Gateway listening at /semp endpoint
-func New(conf map[string]interface{}, site site.API, cache *util.Cache, httpd *server.HTTPd) (*SEMP, error) {
+func New(conf map[string]interface{}, site site.API, httpd *server.HTTPd) (*SEMP, error) {
 	cc := struct {
 		VendorID     string
 		DeviceID     string
@@ -91,7 +90,6 @@ func New(conf map[string]interface{}, site site.API, cache *util.Cache, httpd *s
 	s := &SEMP{
 		doneC:        make(chan struct{}),
 		log:          util.NewLogger("semp"),
-		cache:        cache,
 		site:         site,
 		uid:          uid.String(),
 		vid:          cc.VendorID,