I)—4

The last set of manganese bronze buckets was received and fitted, so that all five turbines have been rebucketted within the last four years. A fire in the tap-changing compartment of one of the Horowhenua regulators was successfully dealt with before much .damage was done.

Generator-running times were :

2. Substations Normal conditions obtained throughout the year, the following incidents onlybeing worthy of special mention : —■ (a) 110 kV. Mangamaire. —A 1,000 k.VA. transformer was replaced by the 1,500 kVA. transformer from Greytown and transferred to Woodville. The 1,500 kVA. synchronous condenser was transferred to the Auckland district . Dannevirke. —The 1,500 kVA. synchronous ' condenser was transferred to the Auckland district. A 1,500 kVA. transformer was transferred temporarily to Waipawa Substation and another ex-Mangahao installed. After a brief period on load this failed, and was railed to Napier for a complete overhaul. This reduced the capacity of the station to 1,500 kVA., causing the Dannevirke Electric-power Board to transfer part of its loading to the Woodville area. Waipawa. —Two 1,500 kVA. transformers were removed in turn for overhaul and provision of Buchholz protection. A transformer from Dannevirke was used as the spare. Bunnytliorpe. —Work necessary to take power from the new Tuai-Bunnythorpe 110 kV. lines was carried out. Khandallah. —The additions necessary to give supply to the second circuit on the Central Park 110 kV. line were made. (b) 50 kV. Edgecumbe. —An earthquake caused a substation outage in October and cracked all the cottage chimneys. Karapiro. —This temporary 50/11 kV. substation was shut down in January. Some of the equipment, including transformers, will be used at Whakamaru. Maraetai. —A flashover on an 11 kV. A.B.S. caused an outage of over six hours on Boxing Day. Waikino. —The synchronous condenser 11 kV. 0.C.8. was badly damaged in April by a flashover due to a rat getting into the cubicle.

12

Time on Load. Time Idle. Time under .Repair. Percentage Availability for Service. Machine No. Hours. Percentage. Hours. Percentage. Not in Demand (Hours). In Demand (Hours). 1 8,242 94-1 315 3-6 203 97-7 2 8,050 91-8 241 2-8 469 94-6 3 8,450 96-4 294 3-4 16 99-8 4 8,422 96-1 315 3-6 21 2 99-7 5 8,437 96-3 304 3-5 19 99-8