Valuing a renewable portfolio: NAV, SOTP and due diligence

Valuing a renewable energy portfolio — for a raise, a sale or a committee — rests on discounting flows and the rigour of consolidation. Here are the methods and the control points of a due diligence.

1. The valuation methods

• Consolidated DCF: discounting the net flows to the shareholder at group level.
• Sum-of-the-parts (SOTP) / NAV: each asset valued separately at its own rate, then added up — the net asset value.
• Multiples (EV/EBITDA, €/MW): useful as a consistency check, not as the primary method.

2. The discount rate by risk profile

The key to a good valuation: a rate per asset, reflecting its risk. An operating asset under a long contract is discounted at a lower rate than a greenfield project (in development). Applying a single rate to the whole portfolio distorts the value.

3. Consolidating properly

At group level (holding / SPV), valuation must handle: dividend up-streaming, shareholder loans, corporate debt, intra-group eliminations (otherwise double-counting) and share sell-downs. This is where most models go wrong.

4. The NAV bridge (auditable)

Between two reporting dates, a NAV bridge breaks down each effect (generation, price, debt, taxes, sell-downs…). Golden rule: Σ of effects = Δ NAV. That is what makes a valuation defensible in due diligence.

5. Due diligence

• Technical: yield, asset condition, O&M contracts.
• Legal: land, permits, sale contracts, insurance.
• Financial: assumptions, debt, taxes, sensitivity — and the traceability of the model.

A versioned model, with a valuation log and an auditable bridge, transforms due diligence: you audit a system instead of trusting a spreadsheet.

6. DCF and SOTP: why they diverge

Consolidated DCF and sum-of-the-parts should converge… but often give different results. The usual causes: a single rate in DCF versus rates per asset in SOTP; a different treatment of cash and corporate debt; or double-counting (a terminal value recovering flows already discounted). Understanding the gap — and being able to reconcile it to the euro with a bridge — is better than blindly picking the most flattering figure. It is a central point of any serious due diligence. See our dedicated guide: NAV vs DCF.

7. The most common valuation pitfalls

• Single rate applied to assets of very different risk (greenfield vs operating).
• Forgotten taxes (production and local taxes) that overstate distributable flows.
• Double-counting between explicit flows and terminal value, or between SOTP and DCF.
• Optimistic merchant curve not stressed over the post-contract period.
• Missed intra-group eliminations that inflate the consolidated NAV.

Many of these pitfalls come straight from a non-auditable business plan. For the underlying metrics, see IRR, NPV, DSCR, LCOE.

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