City of Aspen and Pitkin County - Renewable Energy Mitigation Program

June 11, 2020


Building Codes

The City of Aspen and Pitkin County have adopted both the 2009 International Energy Conservation Code (IECC)—with some amendments—and an Efficient Building Code. 

The Efficient Building ordinance was adopted in 2003 with the intent to encourage cost-effective and sustainable building methods that, among other goals, conserve energy. The code applies to new, remodeled, or additions to one- and two-family dwellings and multiple family dwellings not more than 3 stories in height. These dwellings are required to earn a specific number of points by completing sustainable building practices that can include energy efficiency measures, including installing ENERGY STAR appliances, efficient lighting, and an energy-efficient boiler or furnace, or renewable energy measures, including incorporating passive solar, solar hot water heating, or a photovoltaic (PV) system.

Renewable Energy Mitigation Program

In 2000, the City of Aspen and Pitkin County launched the Renewable Energy Mitigation Program (REMP). Designed to promote renewable energy and energy efficiency, REMP is the first program of its kind in the world. By requiring new homes to mitigate their environmental impacts, REMP has raised over $12 million for energy efficiency and renewable energy projects.

The REMP only applies to houses of 5,000 square feet or more and homes and businesses that feature outdoor spas, pools, or snowmelt systems. Owners of these structures must either pay a REMP fee or install on-site renewable energy systems. 

On-Site Renewable Credits

REMP fees associated with outdoor snowmelt systems, spas, and pools can be offset by installing PV, solar water heating, or geothermal heat pump systems. An owner of a home 5,000 square feet or greater may avoid the REMP fee by installing a 2 kilowatt (kW) PV system or an equivalent renewable energy system. Every kW of PV installed will count as $6,241.20 towards the REMP fee. Solar water heaters can offset REMP fees at $224.65 per square foot of collector area, limited to 500 square feet. Geothermal heat pumps can offset REMP fees at a rate of $6.84 per 100,000 BTU per year of the system's design.


Owners of homes 5,000 square feet or greater must pay a REMP fee equivalent to $1.00 for every square foot of their home.

The REMP payment for snowmelt systems, outdoor pools, and spas are determined by their square footage. The REMP fee for residential snowmelt systems is $34 per square foot divided by the boiler efficiency. The REMP fees for residential outdoor pools and spas are $136 and $176 per square foot, respectively, divided by the boiler efficiency. (Spas 64 square feet or smaller are exempt.) 

The REMP fee for commercial (1) snowmelt systems is $60 per square foot divided by the boiler efficiency (2) outdoor pools is $170 per square foot divided by the boiler efficiency, and (3) spas is $176 per square foot divided by the boiler efficiency. Package spas 64 square feet or smaller are exempt.

REMP-Funded Projects

Fees and payments collected by CORE under REMP are used to fund a residential and commercial grant program and rebates for energy efficiency and renewable energy projects.

Program Overview

Implementing Sector: Local
Category: Regulatory Policy
State: Colorado
Incentive Type: Building Energy Code
Web Site:
Start Date:
Eligible Renewable/Other Technologies:
  • Solar Water Heat
  • Solar Photovoltaics
  • Geothermal Heat Pumps
  • Comprehensive Measures/Whole Building
  • Custom/Others pending approval
Residential Code: 2009 IECC and a local Efficient Building code. Additional requirements for snowmelt systems, outdoor spas and pools, and houses 5,000 square feet or larger.
Commercial Code: 2009 IECC with local amendments. Special requirements for snowmelt systems and outdoor spas and pools.


Name: City of Aspen and Pitkin County Code 11.32
Date Enacted: 2000, amended 2010


Name: Public Information
Organization: Community Office for Resource Efficiency (COR
Address: 111 AABC Suite M
Aspen CO 81611
Phone: (970) 925-9775
Name: Tara Stitzlein
Organization: Aspen CORE
Address: PO Box 9707
Aspen CO 81612
Phone: (970) 925-9775

This information is sourced from DSIRE; the most comprehensive source of information on incentives and policies that support renewables and energy efficiency in the United States. Established in 1995, DSIRE is operated by the N.C. Clean Energy Technology Center at N.C. State University.