4 FM quick reads on power
1. Demand Response Is Inexpensive Way To Save
This is Casey Laughman, managing editor of Building Operating Management magazine. Today's tip is that most demand response programs are low- or no-cost ways to earn energy savings.
Utilities will give many large consumers the smart meters required to collect interval data and therefore the ability to predict power use. As a result, companies and institutions are increasingly choosing to plan their curtailment in anticipation of a demand response call from their local utility providers.
For example, a laboratory with 15 rooftop units can plan ahead of time and when they get a call from their utility, they can push a button on their EMS that slows the fans of the rooftop units slightly, says Lindsay Audin, president of Energywiz. The laboratory doesn't lose that much in cooling capacity, but in conjunction with other steps, it can meet the utility demands for curtailment.
Ultimately that's a zero-cost option, because all that most organizations have to do is program an extra control feature into their existing EMS. Another example is elective electrical loads, such as hot water heaters. Audin says that if you have multiple tanks, you can sequence the heat-up controls to manage demand.
Before working with a utility, facility managers need to collect data on their organization's power use and make an honest, practical assessment about on-site power generation. This can be gathered through interval data from smart meters. In some cases, organizations are offered the meters outright. In others, the utility defrays cost through incentive programs.
Armed with power-use information, facility managers can begin to plan demand response efforts. And while utilities might seem like a sensible place to start, brokers can be involved as well. Utilities often use brokers to pull together facilities interested in participating in demand response programs.
However a facility manager elects to proceed — through a broker or directly through the utility — Audin suggests making an incentive listing published by the U.S. Department of Energy's Energy Efficiency and Renewable Energy Program another stop in the pursuit of demand-response programs.
Demand Response Has Number of Variables
This is Casey Laughman, managing editor of Building Operating Management magazine. Today's tip is that demand response programs have a number of variables involved.
Though the terms are often used interchangeably, voluntary load-curtailment and demand-side management are not the same as demand response. Demand response is binary. When demand surges too high, utilities request a "response" from large users, and they — the utilities — are willing to pay for that reaction. And steamy summer weather is a good time for facility managers to learn how they can best benefit from an energy grid at its limits.
Typically, demand response happens when a utility customer either curtails load or increases on-site generation to supplement utility power consumption. Demand response is really just a new and improved version of interruptible contracts, which were pretty rigid, says Richard Lubinski, president of Think Energy Management. When facilities do curtail demand upon request, utilities will pay for the capacity that is freed up by the reduction in demand.
Essentially, he says, there are two kinds of demand response; one is at the capacity or generation level, the other at the distribution level. For most facility managers, their concern will be the former.
Genuine demand response is a relatively rare event — most organizations only face genuine demand response events for 10 to 20 hours annually, says Lindsay Audin, president of Energywiz, Inc. Nevertheless, demand response is now expanding beyond power generation; natural gas and some water utilities, particularly in the desert Southwest, are also experimenting with demand-response programs.
Demand response also fits neatly in emergency planning. For owners who already own on-site generating capacity, planning for demand response can be part of a sufficiency plan, mostly because a contract with the utility helps ensure the maintenance and regular use of generation capacity — helping ensure generation potential will be available in the case of emergency or extended outage.
Operations an Important Part of Power Reliability
This is Casey Laughman, managing editor of Building Operating Management magazine. Today's tip is that understanding the rules of rebate programs may be easier said than done. In bigger cities with well-documented demand-side management programs, documentation may change year to year. But some utilities change more often than than; one electric utility changed its form six times in six months.
Utilities often require facility managers to take certain steps before an energy upgrade actually begins. Some utility agencies will accept an initial energy audit from a third party, but some may send their own people to verify original conditions. That can sometimes lead to trouble. In one instance, a facilities department ripped out an old system and dumped the motors before the utility came for the initial inspection. The facility then had to do a huge amount of work, including digging up specifications, because they didn't follow the procedure properly.
The complexity of utility rules will depend in part on the nature of the rebate program. A prescriptive program is the most common road to rebates, where a certain amount of dollars are paid for such items as variable frequency drives or lighting retrofits. For example, most utilities will pay prescriptively, by the ton, for rooftop HVAC units above a certain energy efficiency rating. Custom programs usually have a longer time line and more complex measurement and verification. Equipment such as high efficiency boilers, furnaces, or water heaters must be metered over time to show the facility is saving energy.
Custom measures offer more robust rewards, but they require another level of energy analysis that involves measurement over a certain period of time. The measurement has to technically prove energy savings, which have to be reviewed by an agency, and that can take many months. The more complex a project, the more you have to do to meet rebate requirements.
Operations an Important Part of Power Reliability
This is Casey Laughman, managing editor of Building Operating Management magazine. Today's tip is that operations should not be overlooked as a part of power reliability.
One key point that's easily overlooked is that just having a UPS and backup generators isn't enough. It actually has to function when an emergency strikes. That can't be taken for granted. During the Northeast black-out of 2003, half of New York City's 58 hospitals suffered failures in their backup power generators.
The design of a backup power system is only one factor in how well it performs. Just as important is the operational side. Backup diesel generator sets require periodic maintenance and frequent testing if they are to be counted on in an emergency. A facility manager who scrimps on that maintenance and testing may very well compromise the system.
Another issue to consider is if the backup generator uses diesel fuel. Diesel fuel deliveries may be difficult if the power outage is caused by disaster.
Location can also have an operational impact. California had 540 power outages last year. If the batteries in the backup power supply are rated for 2,000 hours, their life expectancy in terms of calendar months is much shorter in California than in an area such as Chicago, where the outages are considerably less frequent. Outages along the East Coast grid also are higher than in other states.
Another problem is lack of commissioning. During commissioning, the design needs to be translated into the generators, uninterruptible power supply components, substation feeds and other elements that the contractor installed. Commissioning is essential to ensure that the backup power system meets the owner's requirements and expressed needs.