Florida VPP Funding-Gap Assumptions: Technical Appendix
This appendix explains the illustrative per-property funding scenario in Joseph Kenney’s Community Energy Infrastructure for AI Data Centers proposal and companion article. It is a transparent planning calculation, not a financing offer, installation quote or estimate of the market value of grid capacity.
Why there are two funding gaps
A $30,000 installed system less $18,000 in total household payments leaves a $12,000 simple undiscounted capital gap. That comparison excludes operating costs and treats future receipts as though they were available today.
The $20,992 modeled present-value funding gap discounts future household receipts and includes a discounted operating/replacement allowance. Present value expresses future cash flows in today’s dollars under an assumed discount rate. Neither gap establishes an actual subsidy, sponsor commitment or consumer payment offer.
Timing and assumptions
| Input | Assumption |
|---|---|
| Installed capital cost at time zero | $30,000 per property |
| Participant payment | $150 at each month-end; no escalation |
| Participant-payment term | 120 months (ten years) |
| Discount rate for monthly receipts | 8% nominal annual, divided by 12 |
| Monthly discount rate | 0.08 / 12 = 0.0066666667 |
| Operating/replacement allowance | $500 at each year-end for years 1–10 |
| Discount rate for annual operating allowance | 8% annually |
| Tax credit | None assumed |
| VPP service revenue | None assumed |
| Residual asset value | None assumed |
The 8% is a modeling discount assumption, not a quoted loan APR. Receipt discounting uses a monthly rate of 8%/12, while year-end upkeep uses an annual factor of 1.08. Those are the conventions in the supplied model; this appendix does not silently convert one to match the other. An alternative timing or discount convention would require a separately identified recalculation.
1. Simple undiscounted capital gap
Total participant receipts:
120 months × $150/month = $18,000
Simple capital gap before upkeep and discounting:
$30,000 − $18,000 = $12,000
This is a capital-only comparison. It is not the full modeled support requirement and does not include any operating/replacement allowance.
2. Present value of participant receipts
Let C = $150, n = 120 months and r = 0.08/12 per month. Payments occur at the end of each month, so the ordinary-annuity formula applies:
PV_receipts = sum from m = 1 to 120 of $150 / (1 + r)^m
= $150 × [1 − (1 + r)^(-120)] / r
= $150 × [1 − (1 + 0.08/12)^(-120)] / (0.08/12)
= $12,363.222134...
≈ $12,363.22
The $18,000 nominal total is larger because it adds ten years of future receipts without discounting them. Present value is not a deduction from what households actually pay.
3. Present value of upkeep
The operating/replacement allowance is $500 at each year-end for ten years, discounted at 8% annually:
PV_upkeep = sum from y = 1 to 10 of $500 / (1.08)^y
= $500 × [1 − (1.08)^(-10)] / 0.08
= $3,355.040699...
≈ $3,355.04
This allowance is an illustrative model input, not a maintenance quote or proof that replacement costs will be fully covered.
4. Modeled outside support
Outside_support = Capital + PV_upkeep − PV_receipts
= $30,000 + $3,355.040699... − $12,363.222134...
= $20,991.818565...
≈ $20,991.82
≈ $20,992 to the nearest dollar
≈ $21,000 at the article's headline precision
| Measure | Per property |
|---|---|
| Capital paid upfront | $30,000.00 |
| Add: present value of upkeep | $3,355.04 |
| Less: present value of participant receipts | −$12,363.22 |
| Modeled present-value outside support | $20,991.82 |
For comparison, the $12,000 simple gap is smaller because it excludes upkeep and does not discount future household receipts. The article’s comparison chart uses $12,000 and $20,992, rounded to whole dollars.
What could change the result
Financing fees, payment defaults, higher actual upkeep, early exits or costs beyond year ten could increase the requirement. Verified grid-service revenue could reduce it, but no such revenue is included in this base case. Changing capital cost, payment amount, timing, discount rate or contract duration also changes the result.
No tax credit, residual value or government-program funding is assumed. In particular, this is not a representation that residential spending in 2026 qualifies for a 30% federal section 25D credit. Actual tax treatment requires separate advice and current eligibility review.
Outside support is a residual financing requirement, not proof that a utility should pay that amount for capacity. Grid value, community value and the party responsible for each cost must be established separately, with independently verified performance, consumer protections and no improper cost shift to other ratepayers.
Conditional third-party ownership pathway
The incentive-free base case above is unchanged. If a commercial VPP operator or other third-party owner qualifies for and fully realizes a 30% section 48E business credit, $30,000 ×30% = $9,000; $20,991.82 −$9,000 = $11,991.82, or about $12,000 of remaining support before depreciation. This simple sensitivity treats the credit at face value without discounting realization; transfer discounts, fees, tax timing and tax capacity can reduce its financing value.
Eligible depreciation could reduce the remaining need further, but it belongs to the qualifying owner and requires separate tax modeling, including the credit’s basis adjustment. The business pathway does not restore the homeowner’s section 25D credit for new 2026 spending. Construction timing, solar’s generally applicable end-of-2027 service deadline and earlier-start exceptions, battery-specific timing, sourcing/material-assistance restrictions, labor rules and monetization must be reviewed by tax professionals. See section 48E and Public Law 119-21 and IRS residential-credit guidance.
Such ownership could support financing by data centers or venture/infrastructure investors; this arithmetic establishes no investment return, committed funding or available program.
Source and reproducibility
Assumptions reproduce the Financing Scenarios section of Joseph Kenney’s November 4, 2026 policy brief: printed page 7 of the Revised Edition and page 10 of the Illustrated Edition. The same assumptions and rounded results appear in both editions. A public link can be added once the approved edition is available.
The numerical calculation is reproducible with:
monthly_rate = 0.08 / 12
pv_receipts = 150 * (1 - (1 + monthly_rate)**(-120)) / monthly_rate
pv_upkeep = sum(500 / 1.08**year for year in range(1, 11))
outside_support = 30000 + pv_upkeep - pv_receipts