Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Name | Turbines | Capacity (MW) | Power (MW·hr/yr) | Location (county) | Year Operational | Status |
| --- | --- | --- | --- | --- | --- | --- |
| Allegheny Ridge Wind Farm | 40 | 80 | 210,240 | Blair and Cambria | 2007.0 | Operational |
| Armenia Mountain Wind Farm | 67 | 101 | unknown | Tioga and Bradford | 2010.0 | Operational |
| Bear Creek Wind Power Project | 12 | 24 | 70,000 | Luzerne | 2006.0 | Operational |
| Broad Mountain Wind Energy Center | 35 | 70 | unknown | Schuylkill | 2012.0 | Planned |
| Casselman Wind Power Project | 23 | 34.5 | 90,666 | Somerset | 2007.0 | Operational |
| Chestnut Flats Wind Farm | 19 | 38 | unknown | Blair and Cambria | 2011.0 | Operational |
| South Chestnut Wind Project | 23 | 46 | unknown | Fayette | 2011.0 | Operational |
| Forward Wind Project | 14 | 29.4 | 77,263 | Somerset | 2008.0 | Operational |
| Green Mountain Wind Energy Center | 8 | 10.4 | 27,331 | Somerset | 2000.0 | Operational |
| Highland Wind Project | 25 | 62.5 | unknown | Cambria | 2009.0 | Operational |
| Laurel Hill Wind Energy Project | 35 | 70.5 | unknown | Lycoming | 2012.0 | Under Construction |
| Locust Ridge I | 13 | 26 | 68,328 | Schuylkill | 2004.0 | Operational |
| Locust Ridge II | 51 | 102 | 268,056 | Columbia and Schuylkill | 2008.0 | Operational |
| Lookout Wind Project | 18 | 37.8 | 99,338 | Somerset | 2008.0 | Operational |
| Mehoopany Wind Farm | 88 | 140.8 | Unknown | Wyoming | 2012.0 | Operational |
| Meyersdale Wind Power Project | 20 | 30 | 78,840 | Somerset | 2003.0 | Operational |
| Mill Run Wind Energy Center | 10 | 15 | 39,420 | Fayette | 2001.0 | Operational |
| North Allegheny Wind Farm | 35 | 70 | unknown | Blair and Cambria | 2009.0 | Operational |
| Patton Wind Farm | 15 | 30 | unknown | Cambria | 2012.0 | Operational |
| Rausch Creek Wind Farm | 50-60 | 100-120 | unknown | Schuylkill | 2012.0 | Planned |
| Sandy Ridge Wind Farm | 25 | 50 | unknown | Centre | 2012.0 | Operational |
| Stonycreek Wind Farm | 35 | 52.5 | unknown | Somerset | 2009.0 | Operational |
| Somerset Wind Farm | 6 | 9 | 23,652 | Somerset | 2001.0 | Operational |
| Twin Ridges Wind Farm | 68 | 140 | Unknown | Somerset | 2012.0 | Operational |
Question:
What locations are considered centre?
Answer:
unknown