Whitehall has moved to steady how business rates from local renewable energy schemes flow through council finances. The Non‑Domestic Rating (Renewable Energy Projects) (Amendment) Regulations 2026 were laid on 9 March and take effect from 1 April 2026, according to the House of Lords Business list and prior government guidance. (lordsbusiness.parliament.uk)

The timing is deliberate. From April 2026, the Non‑Domestic Rating (Multipliers and Private Schools) Act 2025 allows new differential multipliers: two lower bands for retail, hospitality and leisure properties and a higher band for high‑value hereditaments. Without a correction, the sums councils are allowed to disregard for qualifying renewable projects would have drifted with those new bands. (legislation.gov.uk)

The new statutory instrument introduces a “relevant multiplier ratio”. In plain terms, councils will compare the multiplier actually applied to a property on any given day with a baseline multiplier and then scale the day’s disregard accordingly. The aim, set out in the government’s response to its technical consultation, is to keep the renewable‑project disregard neutral despite the arrival of RHL and high‑value multipliers. (gov.uk)

For 2025–26 nothing changes. From 1 April 2026, the ratio applies day‑by‑day across the designated renewable classes in the 2013 regulations, so the overall amount a billing authority can disregard should mirror the position as if the new multipliers did not exist. That preserves policy intent while the wider rating system shifts. (gov.uk)

One constant is the ring‑fence. Under the rates retention scheme, income from qualifying renewable energy projects is carved out and retained locally rather than shared with central government; the NNDR3 guidance on GOV.UK sets this out and remains the rationale for the disregard. The SI keeps that local incentive intact. (gov.uk)

Investor take: the ratio does not change a project’s business‑rates bill; it changes how the host authority reports the portion it can exclude from pooled income. For developers, this keeps the signal steady-councils still see the same real‑terms benefit from hosting wind, solar or hydro, supporting planning conversations and community‑benefit commitments.

An illustrative workflow helps. A qualifying solar farm’s bill for 2026/27 is calculated using whichever multiplier applies that day. When the billing authority calculates the daily disregard under the renewables rules, it multiplies that day’s non‑domestic rating income by the new ratio. If the project is on a lower RHL multiplier, the ratio lifts the disregard back towards the baseline; if it falls into the higher ‘high‑value’ band, the ratio trims it-either way, the outcome tracks what would have applied under the standard or small‑business multipliers. (gov.uk)

What finance directors should do now: check April bills to confirm which multiplier appears on each site; model 2026/27 cashflows with the appropriate multiplier for the liability side but assume the host council’s renewable disregard remains neutral; and align NNDR1/NNDR3 reconciliations with the new ratio. The government response flags a bespoke data collection in summer 2026 and a 2027/28 settlement reconciliation to true‑up the system. (gov.uk)

Points to watch include the 2026 revaluation, any sector‑specific reliefs and local agreements linked to retained business rates, all of which can still nudge project returns. Lenders may also want borrower models to show how rate‑bill changes interact with DSCR headroom even if the council’s disregard is smoothed by the ratio.

Bottom line: this is a stability measure. By neutralising the effect of new multipliers on the renewable‑project disregard, ministers keep local incentives predictable while reforming business rates elsewhere-useful for planning timetables and for investor signalling in the 2026/27 year. (legislation.gov.uk)