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Would building owners get a straight answer if they asked for the simple payback of a lobby renovation project? Instead of looking for tangential ways to create value, consulting engineers energy efficiency and decarbonization projects repeatedly fall into the trap of using energy savings (and some may now include carbon emissions fines savings) to justify investments in energy conservation measures, and often this linear thinking approach yields unattractive investment economics. Alternatively, conduct scenarios analyses including net present value calculations. The lowest net present cost or negative net present value (NPV) over the decarbonization period will provide deep insight into choosing energy conservation measures. Return on investment (ROI) and/or internal rate of return (IRR) on the incremental cost of action over a do-nothing baseline will help persuade real estate owners to prioritize these projects. Rather than a simple payback analysis that looks only at the decarbonization path, the analysis should focus on comparing a decarbonization path with a "business as usual" path. This approach helps isolate the incremental cost of decarbonization over a business as usual approach. This type of analysis requires completing a Strategic Decarbonization Assessment (SDA), which is based on a discounted cash flow Discounted Cash Flow (DCF) analysis over the decarbonization period. The SDA should include the complexities of a capital refresh, tenant improvements, and non-energy benefits. Asset investment should be in the context of a comprehensive decarbonization roadmap rather than simply reactive maintenance.

A one-to-one equipment swap with air source heat pumps, which is typically the first full electrification option considered, may not be a realistic decarbonization strategy particularly for owners of large buildings facing various constraints around thermal distribution systems, outdoor roof space, tenant disruption, and energy supply. In fact, we are suggesting that you determine the building’s need for heat pumps towards the end of the decarbonization road mapping process so these heat pumps can run optimally. Significantly reducing loads, recovering and reusing heat wherever possible by enabling thermal networking, and using a cascading approach to decarbonizing easy-to-electrify loads is likely advantageous. Systems should be optimized to deliver heat or cooling efficiently over the integrated sum of the year’s diverse conditions, the vast majority of which are at part-load. Efforts to reduce and shift loads can help reduce peak capacity, and electrification of more difficult peaks may require special consideration within the building’s roadmap, taking a rational approach to resilience and accounting for evolving electric grid or thermal network supply conditions. This is the foundation of Resource Efficient Electrification (REE).

Yes, usually. So hedge your bets. There are plenty of technology-neutral enabling steps to take prior to committing to a particular low carbon retrofit technology. Asset and sustainability managers should also recognize nothing lasts forever. Buildings Buildings are ever evolving and exist on a continuum unless demolition is planned - they are ever evolving. Reducing loads, enabling thermal recovery, sharing and networking, and implementing grid interactivity measures are all priority measures that might take place prior to electrifying heat sources. Consultants must also determine the value of inaction and the value at risk if a building owner decides to do nothing. Balancing this risk with technological innovation on a time axis is a delicate analysis, and impossible to conduct without a Strategic Decarbonization Assessment. When in doubt, look to leverage your existing infrastructure like using chilled water loops for heating, replacing partial loads. Electrifying perimeter heating used during extreme temperatures may be a later priority or off the critical path on a strategic decarbonization roadmap. Look to the case studies emerging out of the Empire Building Challenge for more information on this strategy.

The question a sustainability or energy manager should be asking is: What other Consider tangential benefits that can be had from pursuing decarbonization early? . For example, more and more Class A tenants are demanding environmental action from landlords to comply with shareholder ESG (environmental, social, and corporate governance) Illustrative temperature bins comprising annual heat load Decarbonization "Blind Spots" 4   requirements. Accelerating facade improvements may reduce invasive and expensive maintenance later. Indoor air quality, improved comfort, and operability are emerging priorities among all tenant types. We know these are not fleeting priorities.

Yes, but not for too long and if the electricity is driving heat pumps, particularly during mild annual part-load conditions, emissions are likely to lower even today. States are legislating 100% carbon-free electric grids like New York did in the Climate Leadership and Community Protection Act (CLCPA). Modeling total emissions over time using declining electric grid carbon emissions coefficients across multiple decarbonization scenarios is an important task. Phasing in electrification over time and in a strategic way is the only pathway to eliminating on-site emissions.

If Even if this is true today, it doesn’t mean a building owner owners should not abandon all attempts to decarbonize or plan for ongoing work to achieve carbon neutrality. Phased, incremental implementation of low carbon retrofits across a continuum is critical to reaching building operations carbon neutrality in cold climates. Don’t fall into the trap of failing to evaluate the Evaluate the cost-effectiveness of phasing and maintaining technology optionality, and the risk mitigation benefits these efforts might deliver. It’s important to remember decarbonization Decarbonization efforts fall on a decision-making tree, which evolves as time elapses and technology, policy or other conditions change; each branch of the decision-making tree is a new decision point. Sustainability and asset managers should can plan these branch intervention points over the decarbonization period.