PHOTOVOLTAICS (PV ) energy cost
- your PV system will survive 25 years
- you have paid 1500* euro per each kW
- each kW in well design PV system should produce 1MWh of energy per year**
RESULT: in 25 years your system will make 25 MWh that means 1kWh (unit of energy) will cost you 1500e/25000kWh = 6cents !!!
*price 1500e per kW can be achieved but that depends on many factors like type of modules, cable length, type of mounting system etc.
**production yield of 1MWh per kW can be achieved in south parts or Ireland and coastal areas. Production yields will decrease with age of the modules (0.5-1% per year )
WIND TURBINE (WT) energy costs
- your wind turbine will survive 25 years
- you have paid 10 000 euro* for 4kW wind turbine
- that wind turbine will produce 8 MWh of energy per year**
RESULT: in 25 years your wind turbine will make 200 MWh that means 1kWh (unit of energy) will cost you 10 000e /200 000 kWh = 5cents !!!
*that price can be achieved if you do installation yourself
** in good windy location with average wind speed of 6m/s and low roughness that production can be achieved by good quality 4kW turbine (4kW means power at wind speed equals 11m/s)
What you pay for energy now ?
Looking today (Nov 2013) at my domestic bill I can see that I pay basic netto price of 17cents per unit of energy !*
*additionally standing charge 34cents per day, PSO Levy and 13.5% of VAT
those are simplified calculations based on assumption that you use all energy from your renewable energy system. If you understand that you can read energy balance chapter