Currency depreciation is not an exception in emerging markets. Treating it as a stress case quietly destroys long term solar returns.
In many solar investment models, foreign exchange risk is treated as a secondary issue. A sensitivity is run, a downside case is added, and the model moves on. This approach assumes that currency movements are rare shocks rather than a defining feature of the market. In many emerging markets, that assumption does not hold. Currency depreciation is not an exception. It is a pattern. Local currencies weaken steadily over time, sometimes sharply, sometimes quietly. Inflation, trade imbalances, and limited access to foreign reserves all contribute. For solar projects with long lifetimes, this erosion is not a stress scenario. It is the environment they operate in. The problem is not that investors are unaware of FX risk. The problem is how it is modeled. FX is often applied as a one time shock or a narrow volatility band. In reality, depreciation compounds year after year. Revenues may be earned in local currency while costs, debt service, or investor returns are tied to hard currency. Over time, this mismatch eats into value even when projects perform exactly as planned operationally. This creates a dangerous illusion. A project can look profitable on paper while steadily losing real value in investor currency terms. By the time this becomes obvious, capital is already deployed and options are limited. Some investors argue that fully pricing FX risk makes projects uninvestable. That concern is understandable. Returns look weaker and approvals become harder. But ignoring reality does not make it disappear. It only delays recognition. A more honest approach is to treat FX pressure as a base case assumption. Models should reflect expected depreciation paths, not idealized stability. Cash flow resilience should be tested under realistic currency scenarios, not perfect ones. Where possible, partial hard currency revenues or structural offsets should be considered early. Solar technology is long lived. Currency risk is persistent. Treating FX as a tail risk in these markets misrepresents reality and weakens decision making. If investors want models that reflect how value actually behaves over time, FX risk must move from the footnotes to the foundation.