IESCO bills in DHA Islamabad are generally lower than DHA Karachi for two reasons: cheaper IESCO tariff slabs in lower-protected-customer brackets, and milder summers that suppress AC load. But winter heating (gas geyser failures plus electric heaters) brings December-February peaks. Sizing accordingly:
500 yd² plot, double-storey (Phase 1, Phase 2 Sector D-E): Bill PKR 35,000-55,000/month summer, PKR 25,000-40,000 winter (with electric heater nights). Recommend 8-10 kW hybrid + 8 kWh battery to cover fog mornings.
1 kanal plot, larger family homes (Phase 2 Sector F-G, Phase 5): Bill PKR 55,000-95,000/month summer. Recommend 12-15 kW hybrid + 10 kWh battery. ROI 3.5-4 years given lower IESCO unit rates vs K-Electric.
Bungalows in DHA Valley (Phase 5): Larger plots (1.5-2 kanal), bills PKR 90,000-1,40,000. 18-22 kW three-phase hybrid + 15 kWh battery is the standard configuration.
For DHA Islamabad we factor in winter generation drop — sizing tends to come in 8-12% higher than the equivalent Karachi bill would suggest, to maintain net-zero on annual basis.