diff --git a/README.md b/README.md
index a0be8bb..a0a0920 100644
--- a/README.md
+++ b/README.md
@@ -26,8 +26,13 @@ The frontend is in https://github.com/arnaucube/gogame-frontend
 	- [x] building costs
 	- [x] building time
 	- [x] research time
-	- [ ] energy costs
+	- [x] energy costs
+	- [x] energy production
+	- [ ] production factor (based on positive/negative energy)
+- [ ] ships
 	- [ ] ships costs
 	- [ ] ships building time
 	- [ ] ships travel time
 - [ ] battle engine
+- [ ] lab technologies
+	- [ ] how tech affects to production of material & times
diff --git a/constants/constants.go b/constants/constants.go
index 5ee6d3d..3dc2860 100644
--- a/constants/constants.go
+++ b/constants/constants.go
@@ -5,7 +5,7 @@ package constants
 const GALAXYSIZE = 50
 const SOLARSYSTEMSIZE = 15
 
-const UniverseAcceleration = 5
+const UniverseAcceleration = 1
 const MineVelocity = 1
 
 // extra
diff --git a/go.mod b/go.mod
index 8a89239..d6e1109 100644
--- a/go.mod
+++ b/go.mod
@@ -17,4 +17,4 @@ require (
 	gopkg.in/mgo.v2 v2.0.0-20180705113604-9856a29383ce
 )
 
-replace githoub.com/arnaucube/gogame => ./
+replace github.com/arnaucube/gogame => ./
diff --git a/models/calc.go b/models/calc.go
index a84362d..89a8d01 100644
--- a/models/calc.go
+++ b/models/calc.go
@@ -39,14 +39,11 @@ func DeuteriumGrowth(ilvl int64, idelta int64) int64 {
 	r := (perHour / 60) * delta * constants.MineVelocity
 	return int64(r)
 }
-func SolarGrowth(ilvl int64, idelta int64) int64 {
+func SolarGrowth(ilvl int64) int64 {
 	lvl := float64(ilvl)
-	delta := float64(idelta)
-
 	// 20 * L * 1.1^L
-	perHour := constants.UniverseAcceleration * 20 * lvl * math.Pow(1.1, lvl)
-	r := (perHour / 60) * delta * constants.MineVelocity
-	return int64(r)
+	production := 20 * lvl * math.Pow(1.1, lvl)
+	return int64(production)
 }
 func FusionGrowth(ilvl int64, ilvlTech int64, idelta int64) int64 {
 	lvl := float64(ilvl)
diff --git a/models/calc_test.go b/models/calc_test.go
index bce612b..da17c2a 100644
--- a/models/calc_test.go
+++ b/models/calc_test.go
@@ -24,9 +24,9 @@ func TestGrowth(t *testing.T) {
 	assert.Equal(t, int64(19), DeuteriumGrowth(2, 60)/constants.MineVelocity)
 
 	// solar
-	assert.Equal(t, int64(22), SolarGrowth(1, 60)/constants.MineVelocity)
-	assert.Equal(t, int64(44), SolarGrowth(1, 120)/constants.MineVelocity)
-	assert.Equal(t, int64(48), SolarGrowth(2, 60)/constants.MineVelocity)
+	assert.Equal(t, int64(22), SolarGrowth(1))
+	assert.Equal(t, int64(48), SolarGrowth(2))
+	assert.Equal(t, int64(79), SolarGrowth(3))
 
 	// fusion
 	assert.Equal(t, int64(31), FusionGrowth(1, 1, 60)/constants.MineVelocity)
diff --git a/models/planet.go b/models/planet.go
index 526bc7f..25bc36b 100644
--- a/models/planet.go
+++ b/models/planet.go
@@ -2,7 +2,6 @@ package models
 
 import (
 	"errors"
-	"fmt"
 	"strconv"
 	"time"
 
@@ -116,17 +115,24 @@ func (p *Planet) GetResources() (*Resources, error) {
 
 	// get Resource-Plant level in each planet
 	// and calculate growth = ResourcePlant.Level for each planet
-	var metalGrowth, crystalGrowth, deuteriumGrowth, energyGrowth int64
+	var metalGrowth, crystalGrowth, deuteriumGrowth int64
 	metalGrowth = metalGrowth + MetalGrowth(p.Buildings["metalmine"], int64(delta))
-	crystalGrowth = crystalGrowth + MetalGrowth(p.Buildings["crystalmine"], int64(delta))
-	deuteriumGrowth = deuteriumGrowth + MetalGrowth(p.Buildings["deuteriummine"], int64(delta))
-	energyGrowth = energyGrowth + MetalGrowth(p.Buildings["energymine"], int64(delta))
+	crystalGrowth = crystalGrowth + CrystalGrowth(p.Buildings["crystalmine"], int64(delta))
+	deuteriumGrowth = deuteriumGrowth + DeuteriumGrowth(p.Buildings["deuteriummine"], int64(delta))
+
+	// get energy generated and used
+	energyGenerated := int64(500)
+	energyGenerated = energyGenerated + SolarGrowth(p.Buildings["energymine"])
+	var energyUsed int64
+	energyUsed = energyUsed + MetalMineEnergyConsumption(p.Buildings["metalmine"])
+	energyUsed = energyUsed + CrystalMineEnergyConsumption(p.Buildings["crystalmine"])
+	energyUsed = energyUsed + DeuteriumMineEnergyConsumption(p.Buildings["deuteriummine"])
 
 	// calculate newAmount = oldAmount + growth
 	p.Resources.Metal = p.Resources.Metal + metalGrowth
 	p.Resources.Crystal = p.Resources.Crystal + crystalGrowth
 	p.Resources.Deuterium = p.Resources.Deuterium + deuteriumGrowth
-	p.Resources.Energy = p.Resources.Energy + energyGrowth
+	p.Resources.Energy = energyGenerated - energyUsed
 
 	// store new amount to user db
 	err = p.StoreInDb()
@@ -152,9 +158,9 @@ func (p *Planet) SpendResources(r Resources) error {
 	if p.Resources.Deuterium < r.Deuterium {
 		return errors.New("not enough deuterium resources")
 	}
-	if p.Resources.Energy < r.Energy {
-		return errors.New("not enough energy resources")
-	}
+	// if p.Resources.Energy < r.Energy {
+	//         return errors.New("not enough energy resources")
+	// }
 
 	p.Resources.Metal = p.Resources.Metal - r.Metal
 	p.Resources.Crystal = p.Resources.Crystal - r.Crystal
@@ -271,6 +277,7 @@ func (p *Planet) UpgradeBuilding(building string) error {
 	if err != nil {
 		return err
 	}
+	resourcesNeeded.Energy = 0
 	// get time cost of the build
 	timei64 := ConstructionTime(resourcesNeeded, p.Buildings["roboticsfactory"])
 	endsTime := time.Now().Add(time.Second * time.Duration(timei64))
@@ -298,6 +305,5 @@ func ResourcesToPoints(r Resources) int64 {
 	p = p + r.Crystal
 	p = p + r.Deuterium
 	p = p + r.Energy
-	fmt.Println("p", p)
 	return p
 }