Carter Jonas
Carter Jonas

Biomass: a sustainable and financially attractive opportunity

With fossil fuel costs projected to rise and guaranteed income from the Government’s Renewable Heat Incentive (RHI) scheme, biomass boiler systems are an attractive investment proposition for country houses and many other properties.

In a typical country house, a single biomass boiler would create hot water which is pumped through the existing central heating system. Biomass boilers usually use wood-chip or reformed sawdust pellets as a fuel source. The fuel-feed and ignition are fully automated, similar to a conventional oil or gas-fired boiler.

There are plenty of UK-based fuel suppliers, or the wood can be sourced from farm or estate woodland and chipped on site. Woodchip takes up more storage space than wood-pellet, but can be significantly more economical overall.

The RHI scheme is a tiered system linked to heat-output of both domestic and commercial scale biomass boilers. It pays an attractive tariff for renewable-heat generation from the date that the scheme is registered, index-linked to inflation.

The non-domestic RHI may apply to farms and estates with additional cottages and / or a mixed residential / commercial element. It pays an attractive tariff for all heat produced over a 20-year period.

The domestic RHI is applicable to single residential units with boilers of up to 45kW. It pays a higher tariff level for a seven-year period only.

With regard to return on investment, the capital cost of a biomass boiler system is higher than a conventional fossil fuel system, but this can be offset by the income from RHI. Non domestic schemes can deliver anything up to an 18% return on investment.

For example, a country house with mixed domestic and commercial outbuildings or activities, needing around 430,000kWh per annum, may require a biomass boiler system of 200-250kW at a cost of £130-150,000. The annual fuel-saving against an oil-fired boiler would amount to about £3,000 (or more if using wood chip).

In October 2015, the system would qualify for non-domestic RHI of around £14,500 per annum. At these rates, payback would be approximately seven years with an Internal Rate of Return (IRR) of around 15%. There are plenty of finance options for biomass heating installations, varying from standard loan and capital financing, through to Energy Service Contracts (ESCOs) which can provide a free boiler in return for retaining 100% of the RHI. 

Subsidies are falling, so act now. The July 2015 quarterly review reduced the tariff by 25% for systems below 200kW. We expect tariffs to fall again from January, 2016. Biomass boiler installations are an attractive investment and protect against rising fossil fuel costs.

James Robinson, Senior Energy Specialist
T: 01423 707831
E: james.robinson@carterjonas.co.uk