Solar Investment Risks: What Every Accredited Investor Should Know
By Hardik BhatiaPublishedMost solar investment content focuses on the upside - double-digit returns, monthly cash flow, contracted revenue, clean energy impact. That is intentional. Platforms want you to invest.
This blog is different. It is a comprehensive, honest assessment of the risks involved in fractional solar investing, written specifically for US accredited investors evaluating cross-border solar opportunities in India. Every risk here is real. Some can be mitigated. Some cannot. Understanding the difference is what separates informed investing from hopeful speculation.
If a platform will not talk openly about what can go wrong, that is itself a risk factor. Accredited investors are expected to evaluate private offerings independently - and that evaluation starts with risk.
What Is the Biggest Risk in Fractional Solar Investing?
Illiquidity is the single most important risk to understand before investing in fractional solar projects, and it is the one most investors underestimate.
When you purchase membership units in a fractional solar offering, your capital is locked for the duration of the underlying Power Purchase Agreement — typically 10 to 25 years. There is no public exchange where you can sell your units. There is no guaranteed secondary market. If you need that capital back in two years, you likely cannot get it.
This is fundamentally different from stocks, bonds, or REITs. If you own shares of a solar ETF and need liquidity, you can sell in seconds at the current market price. Fractional solar does not work that way. The trade-off is that you receive monthly cash distributions from actual energy sales rather than market-driven price appreciation — but you give up the ability to exit on demand.
The practical implication: do not invest capital you may need access to within the stated investment tenure. Fractional solar should be treated as a long-duration allocation, similar to private equity or a long-term infrastructure fund. If the lock-in period does not fit your liquidity needs, this is not the right asset class — regardless of how attractive the returns look.
What Happens If the Electricity Buyer Defaults on the PPA?
Power Purchase Agreement counterparty risk — the risk that the entity buying electricity from the solar project fails to pay — is one of the most discussed risks in Indian solar investing.
To evaluate this risk properly, you need to distinguish between two very different types of PPAs: DISCOM PPAs and C&I (Commercial & Industrial) PPAs.
DISCOM PPAs are agreements where the electricity buyer is a state-owned distribution company. DISCOMs are the backbone of India's power distribution system, but many are in poor financial health. Payment delays of 60 to 120 days are common. In extreme cases, state governments have attempted to retroactively renegotiate PPA tariffs — the most notable example being Andhra Pradesh in 2019, where the state government attempted to force solar and wind developers to accept tariffs of ₹2.43-2.44 per unit on contracts originally signed at ₹2.72 to ₹5.99 per unit. The Andhra Pradesh High Court ultimately upheld the sanctity of the original PPAs in a March 2022 ruling, but the dispute froze lending and development activity in the state for nearly three years. The MNRE explicitly stated that signed PPAs are "sacrosanct and cannot be renegotiated unless there is a clause to do so in the agreement or a case of corruption has been approved."
C&I PPAs - where the buyer is a private commercial or industrial electricity consumer - carry a different risk profile. C&I buyers typically pay higher tariffs than DISCOMs (because they are displacing even more expensive grid power), and payment discipline tends to be better because the buyer has a direct economic incentive to maintain the contract. The risk is concentrated in the creditworthiness of the specific buyer: a large, profitable manufacturer is a very different counterparty than a small business with thin margins.
Platforms like Sustvest primarily structure investments around C&I PPAs, where the commercial incentive for the buyer to honor the contract is strongest. The due diligence question for investors is not just "is there a PPA?" but "who is the buyer, what is their credit quality, and what happens if they default?" Well-structured PPAs include termination clauses, performance guarantees, and in some cases, security deposits from the off-taker.
Can Regulatory Changes in India Affect Solar Investment Returns?
Yes - and this risk operates at both the central (federal) and state level.
The good news first: India's central government policy environment for solar has been strongly and consistently supportive for over a decade. Recent examples include the GST reduction on solar equipment from 12% to 5% in September 2025, the extension of customs duty exemptions for lithium-ion battery manufacturing capital goods in the February 2026 Union Budget, continued expansion of Production-Linked Incentive (PLI) schemes for domestic solar manufacturing, and an aggressive renewable energy capacity addition target of 500 GW of non-fossil fuel capacity by 2030. At the central level, the policy trajectory is clearly aligned with solar expansion.
The risk sits primarily at the state level. Indian states have significant authority over electricity regulation, open access charges, cross-subsidy surcharges, and DISCOM operations. This creates regulatory fragmentation — what is true in Rajasthan may not be true in Tamil Nadu.
The Andhra Pradesh episode described above is the most extreme example, but it is not the only one. Several states have periodically adjusted open access charges or introduced additional levies that affect the economics of solar power procurement. For investors in C&I solar projects, changes to open access surcharges can directly impact the competitiveness of solar power relative to grid electricity, which in turn affects the long-term viability of the PPA.
The mitigant is that India's central regulatory framework - including the Electricity Act 2003, MNRE's position on PPA sanctity, and judicial precedent from cases like the Andhra Pradesh High Court ruling - provides a strong legal backstop. But legal protection and practical execution are not the same thing. Payment delays, bureaucratic friction, and evolving state-level rules are real operating conditions that affect project economics even when the legal framework is favorable.
What If the Solar Project Underperforms?
Project performance risk is the risk that the solar plant generates less electricity than projected, directly reducing revenue and investor distributions.
Several factors can cause underperformance. The most common is lower-than-expected solar irradiance — essentially, less sunlight than the resource assessment predicted. Solar resource assessments use historical weather data and satellite imagery to estimate expected generation, but actual conditions vary year to year. Monsoon seasons in India (June through September) consistently reduce generation, and annual variability of 5-10% around the long-term mean is normal.
Equipment degradation is a slower but inevitable factor. Solar panels lose roughly 0.5-0.7% of their output capacity per year due to natural degradation of photovoltaic cells. Over a 25-year PPA, cumulative degradation can reduce output by 12-17% compared to year-one performance. Well-structured financial projections account for this degradation curve, but the rate can vary depending on panel quality, operating temperatures, and maintenance practices.
Grid curtailment is an emerging risk as India's solar capacity scales rapidly. Curtailment occurs when the grid operator instructs a solar plant to reduce or stop generation because the grid cannot absorb all the power being produced. CRISIL, a major Indian credit rating agency, has flagged a potential 35 GW curtailment risk in India by 2030 if transmission infrastructure does not keep pace with generation additions. For individual projects, curtailment means lost revenue - electricity that could have been generated and sold is simply not produced.
Other performance risks include inverter failures, soiling (dust accumulation on panels reducing efficiency), and damage from extreme weather events. These are typically managed through professional O&M (Operations & Maintenance) contracts with defined response times and performance SLAs, comprehensive insurance coverage for natural disasters and equipment failure, and real-time monitoring systems that detect anomalies and alert operators immediately.
The key question for investors: does the platform provide transparent, real-time access to generation data so you can track actual performance against projections? If the answer is no, you are investing blind.
Are There Risks Specific to Cross-Border Solar Investments?
Yes - and they layer on top of the project-level risks described above.
Repatriation risk is the risk that regulatory changes in India restrict the ability to move funds out of the country. India's Foreign Exchange Management Act (FEMA) governs cross-border capital flows, and the Reserve Bank of India (RBI) sets rules for foreign investment in Indian entities. Currently, the repatriation framework is well-established and widely used by foreign investors across sectors. However, regulatory frameworks can change, and any tightening of capital account controls could affect the timing or mechanism of investor distributions.
Tax treaty risk relates to the US-India Double Taxation Avoidance Agreement (DTAA), which governs how income from Indian investments is taxed for US residents. Changes to the DTAA - or to domestic tax laws in either country - could alter the after-tax return on your investment. Tax treaties are generally stable, but they do get renegotiated, and the current DTAA between the US and India has been in place since 1991 with amendments.
Information asymmetry is a practical risk in cross-border investing. The solar project is physically located in India, managed by an Indian SPV, and subject to Indian regulations. As a US-based investor, your visibility into day-to-day operations depends entirely on the platform's transparency infrastructure - monitoring dashboards, financial reporting, and communication cadence. Platforms that provide SEC-filed PPMs, audited financials, real-time generation dashboards, and regular investor updates significantly reduce this risk. Platforms that do not should be treated with caution.
Geopolitical risk is a broad category that includes any disruption to the US-India bilateral relationship that could affect investment flows, regulatory treatment of foreign-owned solar assets, or the broader economic environment. The US-India relationship has been broadly positive on energy cooperation, but the tariff trajectory over the past year illustrates how quickly conditions can shift. India faced tariffs as high as 50% in late 2025, which were reduced to 18% under a bilateral deal in February 2026, and then further altered after the US Supreme Court struck down IEEPA-based reciprocal tariffs on February 20, 2026. A temporary 10% tariff under Section 122 is currently in effect, set to expire around July 2026 — with the longer-term rate uncertain pending ongoing Section 301 investigations. Trade policy volatility of this magnitude is itself a risk factor for cross-border investors.
Management and governance risk is the risk that the platform or SPV operators act in ways that are not aligned with investor interests - whether through mismanagement, excessive fees, inadequate maintenance, or failure to enforce PPA terms. SEC filing requirements (Form D, PPM disclosures) provide a layer of accountability, but they do not substitute for independent due diligence on the platform's management team, track record, and governance structure.
How Should Investors Think About Solar Risk vs. Other Asset Classes?
The most common mistake investors make when evaluating solar risk is comparing it to equity market risk. They are fundamentally different categories.
Stock market risk is primarily driven by sentiment, earnings expectations, macroeconomic cycles, and liquidity conditions. A solar stock can drop 40% in a quarter because analysts downgraded the sector — even if every solar plant in the world is operating perfectly.
Fractional solar risk is infrastructure risk: operational (will the plant produce as expected?), contractual (will the buyer pay?), regulatory (will the rules change?), and currency-based (what will the exchange rate do?). These risks are real, but they are structurally independent from what the S&P 500 does on any given day.
This distinction matters for portfolio construction. Adding an asset with fundamentally different risk drivers to a portfolio dominated by equity and fixed-income exposure reduces overall portfolio volatility — even if the asset itself carries meaningful risk. The question is not "is solar risky?" (it is) but "does solar risk correlate with the risks I already have?" (it largely does not).
Here is how the risk profiles compare across asset classes:
Fractional Solar
Market correlation: Very low
Liquidity risk: High (locked)
Currency risk: Yes (INR/USD)
Counterparty risk: PPA buyer
Regulatory risk: Moderate (India + US)
Income predictability: High (contracted PPA)
Inflation protection: Moderate (PPA escalation)
Transparency: Platform-dependent
Public Equities
Market correlation: High (it is the market)
Liquidity risk: Very low
Currency risk: Varies
Counterparty risk: Exchange/broker
Regulatory risk: Low (established)
Income predictability: Low (dividends variable)
Inflation protection: Low-Moderate
Transparency: Very high
US Treasuries
Market correlation: Low
Liquidity risk: Very low
Currency risk: No (domestic)
Counterparty risk: US Government
Regulatory risk: Very low
Income predictability: High (fixed coupon)
Inflation protection: Poor
Transparency: Very high
REITs
Market correlation: Moderate
Liquidity risk: Low
Currency risk: No (domestic)
Counterparty risk: Tenants
Regulatory risk: Low-Moderate
Income predictability: Moderate (lease-based)
Inflation protection: Moderate
Transparency: High
Private Equity
Market correlation: Low-Moderate
Liquidity risk: High (locked)
Currency risk: Varies
Counterparty risk: Portfolio companies
Regulatory risk: Moderate
Income predictability: Low (exit-driven)
Inflation protection: Varies
Transparency: Low
The bottom line: fractional solar is not a low-risk investment. It is a differently-risked investment - with risk factors that are largely independent from your existing stock and bond portfolio. For accredited investors who understand the specific risks and can tolerate the illiquidity, it serves as a genuine diversifier. For investors who need liquidity or cannot tolerate the complexity of cross-border infrastructure investing, it is not the right fit.
Frequently Asked Questions
Can I lose my entire investment in fractional solar? In a worst-case scenario - project failure, PPA termination, uninsured damage, or platform insolvency - it is theoretically possible to lose all or a substantial portion of your investment. This is true of all private offerings and is disclosed in every Private Placement Memorandum. However, the structure of fractional solar (physical asset, contracted revenue, insurance, ring-fenced SPV) provides more structural protection than many private offerings. Total loss would require multiple simultaneous failures across the project, contract, and insurance layers.
Is fractional solar investing regulated by the SEC? Offerings structured under SEC Regulation D, Rule 506(c) are filed with the SEC and subject to federal securities law. This includes Form D filing requirements, PPM disclosures, and the requirement that all investors are verified accredited investors. However, the SEC does not approve or endorse any specific offering - filing with the SEC does not guarantee the quality or safety of the investment. You can verify any issuer's Form D filing on SEC EDGAR.
What insurance protections exist for solar projects? Well-structured solar projects carry comprehensive all-risk property insurance covering natural disasters, fire, and equipment failure, business interruption insurance that compensates for lost revenue during downtime, third-party liability coverage, and equipment warranty coverage from panel and inverter manufacturers (typically 25 years for panels, 10-15 years for inverters). The specific coverage should be disclosed in the PPM or available upon request. Investors should verify that coverage limits are adequate relative to project value.
About Sustvest
SustVest LLC is a Delaware-registered fractional solar investment platform offering SEC Regulation D 506(c) compliant investment opportunities in Indian solar energy projects. Through its US entity structure, Sustvest enables accredited investors to own membership interests (units) in operating solar projects backed by long-term Power Purchase Agreements. Each project is held in a separate Indian SPV, with SustVest LLC owning 100% of each SPV. Investors receive proportional monthly cash distributions in USD, with a minimum investment of $500 and target returns of 10–14% XIRR. Project details, SEC filings, and real-time generation data are available at sustvest.com.
This content is for informational purposes only and does not constitute an offer to sell or a solicitation of an offer to buy any securities. Investments in private offerings under SEC Regulation D are speculative, illiquid, and involve a high degree of risk, including the potential loss of the entire investment. Fractional solar investments are available only to verified accredited investors as defined under SEC Rule 501(a). Past performance is not indicative of future results. Prospective investors should carefully review the Private Placement Memorandum (PPM) and consult with their own legal, tax, and financial advisors before making any investment decision. SustVest LLC does not provide investment, legal, or tax advice.
Sources:
FundsIndia Wealth Conversations — INR/USD depreciation data: 3.9% (5Y), 3.4% (10Y), 4.3% (15Y), 3.5% (20Y) annualized (February 2025)
Credence Family Office — "Since the economic reforms of 1991, rupee has been depreciating at the rate of 3.74% CAGR against US dollar" (LinkedIn, August 2023)
Trading Economics — USD/INR at 95.33, down 13.19% over 12 months (May 4, 2026)
Bonanza Wealth — Foreign portfolio investor outflows exceeding $19 billion, rupee breaching 90 mark (January 2026)
Mercom India — "Andhra Pradesh's Decision to Renegotiate Solar and Wind PPAs Sets Bad Precedent" (September 2019)
AZB & Partners — "No Renegotiation of Tariff under Concluded PPAs: A Win for Clean Energy Power Generators" — AP High Court ruling (March 2022)
Mercom India — MNRE states PPAs are "sacrosanct and cannot be renegotiated" (December 2019)
CRISIL — 35 GW grid curtailment risk in India by 2030
PV Tech — India GST on solar equipment reduced from 12% to 5%, effective September 22, 2025
PV Magazine India — Union Budget 2026-27: BCD exemption extended to capital goods for BESS lithium-ion cells (February 2, 2026)
SEC.gov — Rule 506(c) of Regulation D, Form D filing requirements
Power Line Magazine — "PPAs Rule: Andhra Pradesh High Court upholds the sanctity of contracts" (March 2022)
White House — "Fact Sheet: The United States and India Announce Historic Trade Deal" — tariff reduced from 50% to 18% (February 6, 2026)
Outlook Business — "Tariff Reset: What Trump's New 10% Global Duty Means for India" — Supreme Court struck down IEEPA tariffs Feb 20, 2026; 10% Section 122 from Feb 24, 2026