Solar REC Price Calculator

Inputs

Project Name

Used in exports and reporting.

Market Type

Label only; does not change math.

Currency

Used for display and exports.

Generation Mode

Choose estimation or direct metered values.

System Size (kW)

Used with capacity factor and performance ratio.

Annual Generation (kWh)

If using metered production, enter kWh/year.

Capacity Factor (%)

Typical range: 12–25 depending on location.

Performance Ratio (%)

Accounts for losses: wiring, inverter, temperature.

Degradation (%/year)

Reduces RECs each year as output declines.

Contract Term (years)

Up to 40 years supported.

REC Price Low (per REC)

Conservative scenario price.

REC Price Base (per REC)

Most likely price assumption.

REC Price High (per REC)

Optimistic scenario price.

Price Escalation (%/year)

Applies to all price scenarios each year.

Transaction Fee (% of gross)

Broker, exchange, or aggregator fee percentage.

Admin Cost (per REC)

Registration, verification, and tracking costs.

Discount Rate (%/year)

Used to calculate NPV of net revenues.

Submit inputs to see a yearly breakdown here.

Example Data Table

These sample rows show typical inputs and the resulting base-scenario NPV net revenue.

Example Project	System (kW)	Annual kWh	Annual RECs	Base Price	Term	NPV Net
Warehouse Rooftop	150	178,704	178.70	$16.00	5y	$12,026.18
Site Office Microgrid	60	77,894	77.89	$18.00	3y	$3,763.57
Industrial Yard Solar	400	574,656	574.66	$20.00	7y	$64,145.84

Examples use: escalation 2%, fee 3%, admin $0.35/REC, discount 8%, degradation 0.5%.

Formula Used

Annual kWh estimate: kWh = kW × 8760 × (Capacity Factor) × (Performance Ratio)
Annual RECs: RECs = kWh ÷ 1000 (1 REC equals 1 MWh)
Yearly RECs with degradation: RECs_y = RECs × (1 − d)^(y−1)
Yearly price with escalation: P_y = P₁ × (1 + e)^(y−1)
Gross revenue: Gross_y = RECs_y × P_y
Fees and admin: Fees_y = (Gross_y × f) + (RECs_y × a)
Net revenue: Net_y = Gross_y − Fees_y
NPV of net: NPV = Σ Net_y ÷ (1 + r)^(y−1)

How to Use This Calculator

Select a generation mode: estimate from system size, or enter metered annual kWh.
Enter REC prices for low, base, and high scenarios to capture uncertainty.
Set the contract term, escalation, and degradation to match project assumptions.
Add transaction fees and admin costs to reflect monetization expenses.
Choose a discount rate to evaluate NPV for budgeting and approvals.
Click Calculate to display results above the form, then export CSV or PDF.

REC revenue drivers in construction portfolios

Solar RECs convert onsite generation into tradable environmental value. This calculator links project production, pricing ranges, and monetization costs to quantify potential net proceeds. Use it to compare rooftop arrays, site microgrids, and temporary power offsets across multiple contract terms.

Output basis: metered kWh or estimated from system size.
REC issuance: 1 REC per 1 MWh of eligible generation.
Planning view: low, base, and high pricing scenarios.

Production estimation inputs and typical ranges

When estimating annual generation, capacity factor and performance ratio represent site resource and system losses. For many commercial rooftop projects, capacity factor commonly falls between 12% and 25%, while performance ratio often ranges from 75% to 90% depending on design, soiling, and inverter loading.

Degradation reduces annual RECs over time, so longer terms should reflect realistic decline. A planning value near 0.3%–0.8% per year is frequently used for modern modules, but confirm with warranties and operating history.

Price scenarios, escalation, and contract term sensitivity

REC pricing varies by market type, eligibility, and timing. Scenario pricing helps stress-test budgets: a conservative low, a most-likely base, and an upside high. Escalation applies a consistent annual change to all scenarios, allowing quick comparison of fixed versus rising price assumptions over the selected term.

Example data: system 250 kW, capacity factor 18%, performance ratio 80% produces about 315,360 kWh annually and 315.36 RECs. At a base price of $18 per REC, year‑1 gross is roughly $5,676 before fees.

Net proceeds, fees, and discounted value for decisions

Monetization costs can materially change outcomes. This calculator subtracts a percentage transaction fee on gross revenue and a per‑REC admin cost for tracking, verification, and settlement. Net cashflow is then discounted to produce NPV, supporting apples‑to‑apples comparison across terms and procurement options.

Use the discount rate that matches your internal hurdle rate or financing cost. A higher discount rate reduces NPV and emphasizes near‑term revenues, which is useful when projects face schedule risk or uncertain regulatory timelines.

Reporting outputs for audits and stakeholder communications

Exportable CSV and PDF outputs make it easier to document assumptions, attach calculations to sustainability narratives, and reconcile REC revenues with energy procurement records. Keep a consistent naming convention for projects, and store the exported report with contract and tracking documentation for future audits.

FAQs

1) What is one Solar REC in energy terms?

One REC generally represents 1 megawatt-hour (1,000 kWh) of eligible renewable electricity generated and recorded in a tracking system.

2) Should I use estimate mode or manual annual kWh?

Use manual mode when you have metered production or a verified model. Use estimate mode for early-stage planning when only system size and performance assumptions are available.

3) Why do low, base, and high prices matter?

REC prices can change by program rules, supply, demand, and contract structure. Multiple scenarios help you evaluate downside risk and upside potential before committing terms.

4) How are fees applied in this calculator?

A percentage transaction fee is applied to gross revenue, and an admin cost is applied per REC. Both are subtracted to produce yearly net and the final totals.

5) What does escalation represent?

Escalation is the assumed annual change in REC price over time. Positive values model rising prices; negative values model declining prices, applied consistently across scenarios.

6) What is NPV and why use it?

NPV discounts future net cashflows to today’s value using your discount rate. It helps compare options with different terms by reflecting time value of money and risk.

7) Can I use this for multiple projects?

Yes. Run each project with its own inputs and export the results. Keep the CSV or PDF files to consolidate portfolio reporting and budgeting across sites.