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NABCEP PVTS study materials
NABCEP PVTS study resources

NABCEP PVTS: Domain 4: Financial Analysis and Incentives

NABCEP PVTS · Work through your exam, one topic at a time.

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Domain 4: Financial Analysis and Incentives

Domain 4 covers the economics: federal and state incentives, tariff compensation, financing structures, and the metrics used to compare options. Questions test incentive mechanics, what a payback or IRR actually measures, and how tax treatment changes the customer's net cost.

Incentives and tax treatment

  • The federal investment tax credit is a percentage of eligible installed cost; it is non-refundable, so the customer needs tax liability in the year the system is placed in service.
  • Bonus credits (domestic content, energy community, low-income) can raise the rate; some small projects qualify for a 5× multiplier on bonus credits, with exceptions at or below 1 MW.
  • Commercial systems also use MACRS 5-year depreciation; bonus depreciation phases down by placed-in-service year - confirm the rate in effect.
  • State and utility rebates may be taxable or may reduce depreciable basis, which changes the after-tax math.
  • Federal rules changed with 2025 legislation; verify current eligibility before promising any credit.
  • Net metering, net billing, and buy-all/sell-all produce very different export values, and TOU rates decide when production is worth most.

Metrics

  • Simple payback = net cost / first-year savings; it ignores time value and escalation.
  • NPV discounts future cash flows at the customer's discount rate; positive NPV means the investment beats that alternative.
  • IRR is the discount rate where NPV = 0; compare it to the customer's cost of capital.
  • LCOE is levelized cost per kWh produced; compare it to the customer's marginal rate.

Worked example

8 kW at $2.80/W = $22,400. A 30% credit of $6,720 leaves $15,680. Year-1 production of 11,213 kWh at $0.15/kWh avoided cost saves $1,682. Simple payback = $15,680 / $1,682 ≈ 9.3 years. With 2.5% annual utility escalation, cumulative savings reach the net cost sooner, so quote both the flat and escalating cases.

Traps

Treating a non-refundable credit as cash; ignoring financing interest; comparing a payback figure to an IRR; assuming export compensation equals the retail rate.