eastern lot from Bathurst Street to Yonge Street was ceded to Newmarket, Aurora, and Oak Ridges, the last of which became a part of Richmond Hill. The boundary between Aurora and Newmarket was defined to be St. John's Sideroad, and Newmarket's northern boundary was defined to be Green Lane. The towns of Aurora, Newmarket, and Richmond Hill were defined to be the growth centres for the regional municipality, which was to become a greenbelt between the denser urban areas of Toronto to the south and Barrie to the north. The growth centres were each restricted to grow to a maximum population of 25,000 by 2000, and the regional municipality to 300,000. The municipal realignment merged 40% of East Gwillimbury's population into Newmarket. The council of East Gwillimbury voted to amalgamate with Newmarket, but Newmarket council opposed the amalgamation. In the plan presented by McKeough, the councils of the towns of Newmarket and Aurora were given ten years to decide whether or not to amalgamate. The internal municipal realignments resulted in some politicians residing in a new municipality from that which they represented at the time of realignment. The reeve of Whitchurch Township resided in the western portion of the town that was annexed by Aurora, three East Gwillimbury councillors resided in land annexed by Newmarket, including its future mayor Ray Twinney, and King councillor Gordon Rowe was a resident of Oak Ridges, which became part of Richmond Hill. Hydro Commissions Because of the mix of urban and rural areas in the Region, the provision of electricity was governed in a different manner from the rest of the regional services: the hydro-electric commissions and public utilities commissions that existed at the end of 1970 continued to provide electricity within their respective areas; the councillors of the former Township of Vaughan and the trustees of the former Police Village of King City became members of new Hydro-Electric Commissions for their respective areas; Ontario Hydro continued to have responsibility for providing electricity to those portions of the Region that were not served by any of the above commissions. Electric distribution was partially rationalized in 1978, when: hydro-electric commissions were established for all area municipalities except East Gwillimbury (but it could establish a commission later on, subject to Ontario Hydro's consent); effective January 1, 1979, all assets of the former commissions in the Region were transferred to the new commissions; Ontario Hydro withdrew its