May 2010, but not quickly enough to prevent the need for a boil-water order; part of the delay was the need for follow-up testing. Electrical generation The system includes three hydropower stations (one inactive) and two wind turbines, with a total capacity of 19.8 MW. Water released to the Swift River flows through the Winsor Station below the Winsor Dam but the turbines were damaged in a fire and have not been reactivated. Water transferred from Quabbin to Wachusett can pass either through the turbines at Oakdale or through bypass pipes when flow requirements exceed turbine ratings. Water released from Wachusett into the Cosgrove Tunnel passes through the Cosgrove turbines. The 4 original turbines in the Wachusett Gatehouse, located at the start of the Wachusett Aqueduct, have not been used in over 40 years. A 1.54MW turbine is currently being installed at the dam. A turbine at Southborough at the start of the Weston Aqueduct has also been inactive for a long period. The Quabbin Aqueduct connects the two reservoirs, and relies upon gravity to accommodate the three separate operational needs. First, diversion of water from the Ware River into the Quabbin Reservoir uses this aqueduct. Second, water transfer from the Quabbin Reservoir to the Wachusett Reservoir, through a hydropower station or a bypass pipe, uses it as well. The bypass valves are non-regulating valves, and when opened, only the head in the Quabbin Reservoir and the physical characteristics of the aqueduct govern the flow. Because the turbines are flow limited, the bypass mechanism permits transfer rates nearly twice as high as are possible through the turbines. Operationally, the single aqueduct fulfills three purposes, but only one operational mode is possible at a given time. MRWA also owns and operates several solar power and wind power facilities to help meet Massachusetts' greenhouse gas emission reduction goals, and undertakes energy efficiency projects. As a large customer, it also generates its own electricity at Deer Island Sewage Treatment Plant and Carroll Water Treatment Plant during periods of high demand to earn money with demand response contracts and to avoid high peak-time prices. This further reduces emissions from less-efficient grid peaking power plants that would otherwise be needed. Water system history and plans Major construction Local wells, springs (including one on Boston Common), and rain barrels were the first sources of water for Boston residents. Jamaica Pond was used as a water source