Oklahoma solar calculator

Live production from NLR (formerly NREL) PVWatts V8. Oklahoma operates net metering under 17 O.S. §156 and OCC rules (OAC 165:40:9): monthly production nets against consumption at FULL RETAIL up to the consumption level; any monthly EXCESS (production above consumption) is purchased at AVOIDED ENERGY COST — about $0.02-0.08/kWh depending on utility (modeled at about $0.04/kWh). Dollar-based credits roll forward indefinitely. Both IOUs (OG&E default, central / western OK; PSO eastern OK + Tulsa) follow the same OCC framework — they differ only in retail rate (OG&E about $0.108/kWh, PSO about $0.138/kWh). Co-ops and municipal utilities are NOT required to offer net metering — verify your specific utility. System cap 300 kW DG / 125% of peak load. Right-sizing matters because monthly excess pays only avoided cost. Federal §25D = $0 (OBBBA repeal, signed July 4, 2025). NO state income tax credit. Property tax EXEMPT, PERMANENT — 100% added home value exempt indefinitely. Sales tax NOT EXEMPT — OK 4.5% state + local (combined typically about 8-9%); verify local rate. REC market is VOLUNTARY (NARR) — system owners can sell RECs as minor optional revenue, not modeled here. NO confirmed utility rebate for 2026 — sources conflict; verify with OG&E / PSO. NO statewide battery rebate. Install pricing about $2.85/W (NREL benchmark). Typical solar-only payback 15-20 years with federal $0; sources citing about 10-13 years assume the dead 30% federal credit. MAIN RISK: OG&E has petitioned OCC in prior rate cases to cut net-metering compensation; as of early 2026 retail-rate credit is intact, but future OCC filings could shift toward avoided-cost-only. Defaults: south-facing roof mount, 20° tilt, 14% losses.