Improving the use of energy in buildings

The Development of a Voluntary Display Energy Certificate Scheme (VolDECs) For Commercial Offices Malcolm Hanna, Technical Director, National Energy Foundation

Contents

• Display Energy Certificates • The need for VolDECs • The VolDEC solution • Pilot Results • VolDEC benefits and costs • Future developments

It’s fairly tangled

The issue for Landlords and Tenants

• No split between Landlord and Tenant • Cannot show improvements (or not) in what each control • DECs use one benchmark for all offices • Many offices are ‘stuck’ at G

The Need

• A Simple entry-level engagement tool • To engage building managers and encourage action • Improve the benchmarks that underpin all DECs • Set standards through an industry-wide scheme • Encourage deeper analysis to benefit the whole industry

The VolDEC solution

Building Energy Solutions Energy Management, Research & Training Consultancy

The VolDEC solution - aims

• Voluntary scheme without government constraints • Not for profit, for benefit of the industry, backed by the industry • To use authoritative sector specific benchmarks • To highlight performance and encourage action • To conduct benchmarking research for the industry • Soft start the commercial sector into measuring performance

The VolDEC solution - the offering

• Easy access, quick, low cost • No lodgement, no site visit, no advisory report • Use the existing DEC methodology as the basis • Use a ‘similar’ (improved) DEC certificate layout • Include a certificate quality rating: HIGH/MEDIUM/LOW • Better (& improving) benchmarks and categories, working with sectors

The VolDEC method

Methodology Statutory DEC

Produced using the methodology described in CIBSE TM47

VolDEC

Produced using the methodology described in CIBSE TM47

Benchmarks Landlord / tenant split

Uses CIBSE TM46 benchmarks. This provides only one benchmark for all office types.

Unable to provide a separate landlord tenant DEC in the same building Uses ECON19 benchmarks for offices. This provides four different office types plus energy is broken down by end use for each type.

Uses the granular energy breakdown in ECON19 to provide composite landlord and tenant benchmarks for 5 different building scenarios.

The VolDEC method

What do you need for a VolDEC?

• • • • • • Building postcode Floor area Approximate hours of occupancy Annual energy use – landlord & Tenant Data year Main heating fuel type

What do you need for a VolDEC

• • Choose office type – closest match

What do you need for a VolDEC

The benefits

Provides landlords and tenants with energy performance for areas they control Stand-alone entry level engagement tool simple, easy access, inexpensive Uses robust DEC method, with more appropriate benchmarks Highlights energy performance, a clear driver for improving performance VolDEC process highlights anomalies, the need for further checks Better benchmarks, working with sectors

Indicative costs

• • • • £250 per VolDEC (1-10 buildings) £150 per VolDEC (11-25 buildings) £100 per VolDEC (26-50 buildings) £75 per VolDEC (51+ buildings) • • • Dependent on data format and data quality Excludes sector/client tailoring Excludes any re-runs due to bad data

Future developments

• • • • • Water and waste (Environmental VolDEC) Floor by floor (individual tenant VolDEC) Shopping centres (new sector) On-line self-input Annual Benchmarking analysis and organisational reports

Improving the use of energy in buildings

Acknowledgements Debbie Hobbs, Sustainability Manager, Legal and General Property Adam Fjaerem (formerly JLL) Nigel Brock (NEF) [email protected]

[email protected]