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| Table 1: Effects of wind turbine and length | |||
| Wind speed (m/s) | Approximate turbine output power with varying turbine blade length (W) Micro (dia = 2 m, Cp = 0.2) | Small (dia = 10 m, Cp = 0.25) | Large (dia = 50 m, Cp = 0.3) |
| 5 | 50 | 1500 | 45,000 |
| 10 | 400 | 12,000 | 360,000 |
| 15 | 1300 | 40,000 | 1,200,000 |
| Table 2: Typical system make-up | |||
| Item | Micro (up to 10 kW) | Small (up to 100 kW) | Large (above 100 kW) |
| Rotor diameter (m) | 02-Jun | 44,013 | 20-50 |
| Hub height (m) | May-15 | 15-25 | 30-50 |
| Gearbox required | No | Yes | Yes |
| Output voltage | 300 V ac 3-phase unregulated | 400 V ac 3-phase regulated | 690 v ac 3-phase regulated |
| Rectifier/controller required | Yes | No | No |
| Inverter required | Yes | No | No |
| Transformer required | No | No | Yes, 690/400 V (or 690/11,000 V) |
| Electrical Integration | Recommendation G83/1*, =+ net metering | Recommendation G59/1** =+ Relay + net metering | Recommendation metering G59/1** + Relay + net |
| ROC*** metering | Unlikely | Possibly | Yes |
| *G83/1 – Recommendations for the connection of small-scale embedded generators in parallel with public low voltage distribution networks | |||
| ** G59/1 – Recommendations for the connection of private generating plant to the electricity boards’ distribution systems/distribution networks | |||
| ***To measure kWh generated by the wind turbine, in order to earn Renewables Obligation Certificates which may be traded in the open market | |||
| Table 3: Breakdown of costs for typical 2000 kW turbine project | ||
| Ìý | Cost £ | Cost £/kW |
| Complete turbine | 1,250,000 | 625 |
| Transportation | 50,000 | Ìý |
| Foundation | 55,000 | Ìý |
| Civil works (eg access roads) | 30,000* | Ìý |
| Electrical network | 40,000* | Ìý |
| Electrical hook-up | 45,000* | Ìý |
| Total capital cost | 1,470,000 | 735 |
| Allowances for warranties and maintenance | 27,500 pa | 13 pa |
| Exclusions: professional and statutory fees, funding and VAT | ||
| * Allowances are based on an analysis of DTI indicative cost models. | ||
| Distance between turbines can affect cable lengths and routing of the cables. In determining the density and spacing of turbines, the costs and losses of the electrical transmission need to be balanced against the aerodynamic losses caused by wakes of closely spaced turbines. | ||
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