Yes there is the issue with both wind and solar that the weather conditions have to be right - and if they are the turbines/panels still might be switched off as the energy isn't needed as it's a blazing hot summer's day and everybody's outside having barbeques and picnics. The next real challenge is to store the surplus energy generated when conditions are right so it can be used when it's the middle of winter, the central heating's on and everyone's curled up in front of the fire watching 'Strictly' with a nice cup of hot tea. The concept of offshore wind farms itself is sound and needs to be extended.the trouble is whether or not the support costs are being counted. i dont know about those numbers, but often they ignore the cost of standby capacity for when the wind doesn't blow (or blows too hard, so they stop them turning to protect gearboxes). that can be considerably expensive as it has to cover a permanent cost base for power not being generated. we end up paying contracts for two power supplies but only using one. things have improved in recent years but theres still some hidden costs.