An IRB is a type of bond issued by a municipality to finance a project it deems to have a wider public benefit. The payouts to the IRB holders are financed by the revenues from the project. The IRB effectively provides a tax exemption to defray part of the cost of the project.
The project, which will be built on a nine-acre plot in Albuquerque’s westside, should enter construction in 2025 with operations beginning in late 2027.
It was procured by utility Public Service Company of New Mexico (PNM) as part of its 2026-2028 Generation Resources Request for Proposals (RFP), and will include upgrades to a PNM substation that it will connect to. PNM is aiming to be zero-carbon by 2040.
“The Sun Lasso Energy Center represents the future of electric energy in New Mexico,” said district commissioner Steven Michael Quezada.
“PNM appreciates the support of Bernalillo County for renewable energy projects such as the Sun Lasso Battery Energy Storage System,” added Don Tarry, PNM president and CEO.
The New Mexico Public Regulation Commission (NMPRC) recently approved PNM’s request to add 309MW of BESS from separate projects to its grid by summer 2026, in June this year (Premium access article). Long-term offtake agreements by utilities like PNM for solar-plus-storage or standalone storage are driving the large-scale market in New Mexico.
Virtually all large-scale BESS projects being built in New Mexico are 4-hour systems, including ones reported on by Energy-Storage.news this year from D.E. Shaw, Enlight and EDF.
